Hey guys,

I have recently started to drive my car a little hard now that it is broken in. I hate to say this, but I have noticed a lack of power between the 2,500 - 3,500 RPM range (This is in any gear.) The turbo's hits 17 PSI around 2,000 RPM but then drops to 10 PSI when I hit the 2,500 - 3,500 RPM range and there is a noticeable loss in power. I know that the turbo's PSI does not reflect the HP I am actually hitting but I actually notice a loss in power. I hope everything is alright with the car. Any ideas? Thank you!

Jake

yea, I hit 15-16 and it stays there, doesn't drop, sounds like yours is doing something odd

does it do it in comp mode as well? JW

Go straight to the dealer and get warrantied.

First ss/tc boost leak?

bruce lee...

might be the spring in the wastegate....it doesnt hold boost that well. go to the dealer

Yah............................................... ....

The problem is... Dealers don't get it when you say stuff like "It should be hitting 15 PSI" etc... They don't believe you or will ask where does it say it's supposed to do that? I bet you'll get a run around.

Should've got an SS/SC.....

Yah............................................... ....

The problem is... Dealers don't get it when you say stuff like "It should be hitting 15 PSI" etc... They don't believe you or will ask where does it say it's supposed to do that? I bet you'll get a run around.


Then, I'd lemon law it.

Fuck it, I love GM, but if the car has problems and the dealer techs are too stupid to fix it...:cussing:

I think the OP should just take it to the dealership and see what, if anything, is wrong.

quick everyone, crucify GM and the dealership before the guy even goes in!!!

It just sucks. I can't believe it just stops pulling out of nowhere and then starts to pull again. If it were a waste gate issue, wouldn't it do it randomly?

quick everyone, crucify GM and the dealership before the guy even goes in!!!


I'm simply saying this...dealership techs suck. I haven't met a single one that is more knowledgeable than myself.


They drive me insane and if I have issues that they can't fix...I WILL lemon law this car.


The LNF is a great engine and I'm sure this guy's SS/TC is fine, but I just hate dealership techs.

I'm simply saying this...dealership techs suck. I haven't met a single one that is more knowledgeable than myself.


They drive me insane and if I have issues that they can't fix...I WILL lemon law this car.


The LNF is a great engine and I'm sure this guy's SS/TC is fine, but I just hate dealership techs.

I couldn't agree more. The majority of techs DO NOT know what they are doing.

So I see no problem with crucifying GM immediately and on the spot until they have earned some respect back.

I couldn't agree more. The majority of techs DO NOT know what they are doing.

So I see no problem with crucifying GM immediately and on the spot until they have earned some respect back.

I do NOT lump the engineers and designers at GM with the monkey idiots at the stealership.

I don't want to crucify GM...it's all dealership technicians.

im thinking boost leak... definately take it back to the dealership

boost leak? You guys are killing me. He said it only does it from 2500-3500rpms. It's a damn computer issue. Just like the car can't really make more power than 260, JUST like hahn had issues with the drag radials at the track. The fucking car is plagued with computer viruses. GM has this fucking car so wrapped up in computer tricks it is ridiculous. I gurantee it's the computer doing something wierd.

i AGREE

When I drove my car down to NC (the car only had 300 miles when I left) I pulled into a rest stop with around 750 on the odometer and when I went to get on it the car just bogged out... I figured I didnt give the computer enough time to learn before hitting cruising speed for 8 hours. I dropped it into 4th and floored it then I slowed down and dropped it in 3rd and did the same thing. I retrained the ecu I think since it runs great now...

I dont know if this will help but ya never know. have you gotten on it at all since you got it? you may just have to go out and romp on it for a little bit so the computer knows what to do with heavy acceleration

my car is at the dealer right now for a lack of power as well. codes and the dealer has no clue why its acting this way... talking with gm to find a resolution. will keep you posted.

if you lived near kansas city missouri, jeremie(on this site) is an awesome gm tech. I'm sure he could find the problem.

if you lived near kansas city missouri, jeremie(on this site) is an awesome gm tech. I'm sure he could find the problem.

I'm in col. oh so I don't think thats going to happen but thanks!;)

Ok, I haven't taken mine it yet but it is definitely not as quick as the car I test drove. I can't think of anything I've done to cause damage. I am using 76 station 91 octane gas in it and it seems to run well with it. Is 76 gas decent? I'm pretty sure it's Top Tier.

Right around ~500 miles on my SS/TC. I've taken it to 5k rpms a couple times in second. Tonight I actually wound 1st gear to 5500 and went into second briefly. Some dumbass behind me at a red light kept honking (2 lane road, both of us turning left, no turn signal). There was a line of cars coming the other way so I obviously couldn't go, but this dumbass is so impatient to get home to fuck his ulgy wife, so I wait until it's clear and wait a second or two more just to piss him off even more and assure he got caught by the red light while I sped off...

wtf does this have to do with the topic...lol I almost forgot for a second. My car still pulls hard and feels to have alot left to offer.

boost leak? You guys are killing me. He said it only does it from 2500-3500rpms. It's a damn computer issue. Just like the car can't really make more power than 260, JUST like hahn had issues with the drag radials at the track. The fucking car is plagued with computer viruses. GM has this fucking car so wrapped up in computer tricks it is ridiculous. I gurantee it's the computer doing something wierd.

here here.

or rather

hear hear.

76 Gasoline? Good, bad, whatever?

and so it begins....:D

I'm sure GM will have a software update

don't get your panties in a bunch

I'm sure GM will have a software update

don't get your panties in a bunch

I'm so relieved now! Thanks man!

and so it begins....:D

LOL I know, i was just waiting for the problems to start w/ the TC's... :thumbsdow

You might be getting some knock retard with only 91 octane (depending on your driving conditions). You don't have access to 93 or 94?

You might be getting some knock retard with only 91 octane (depending on your driving conditions). You don't have access to 93 or 94?

No I don't. California is stuck at 91 as far as I know. :thumbsdow

http://www.chevrolet.com/cobalt/specifications/

I said before 91 is fine & chevy even says you don't need 91, but I would put super.

I have the exact same kind of leak issue, but it doesn't happen all the time. It seems to happen only when I follor it at 2500 to 4000 rpm. But from a start, each gear is pulling hard, no hesiation....

Weirdness I just got this happening on my car too. Any updates? I'm taking mine to the dealer.

ok no need to start busting on the turbo cobalts just bc there are some problems. Im just saying, turbos require more things to work properly that s/c do. But since its from the factory it should be fine. Bring it to the dealership and they will fix it or get you a new car. just dont mod it :)

My car is with the dealer now. Took the mechanic for a test drive with me and reproduced the problem. He didnt seem as convinced as I was but that's just because he never drove the car before this issue started. I know I'm not crazy, lol, there has to be a problem. I'm gonna guess it's a leak of some sort. Hopefully it is a very simple to solve issue. I will post again when I hear from them tomorrow.

My car is with the dealer now. Took the mechanic for a test drive with me and reproduced the problem. He didnt seem as convinced as I was but that's just because he never drove the car before this issue started. I know I'm not crazy, lol, there has to be a problem. I'm gonna guess it's a leak of some sort. Hopefully it is a very simple to solve issue. I will post again when I hear from them tomorrow.

I never took mine into the dealer after starting this thread. I am at 850 miles right now and the problem is gone :). Let me know what you hear. It seemed to slowly go away. The car is running VERY well now. Maybe I had some bad gas or something? I have had very bad experiences with the gas stations around my area. In my Acura RSX I used to get spark knock if the gas was not good. It happened very often. Anyway, good luck!

Glad everything all good I want all the bugs out of this car for 09 in april
Well good luck

I am hoping it was just a hiccup but it happened consistently all day today....so I dunno. 874 kms on the odometer.

drive it like you stole it and see what happens

drive it like you stole it and see what happens

Already attempted that yesterday. No abusing, just full throttle from about 2500rpm. Issue continued to occur.

I have the exact same kind of leak issue, but it doesn't happen all the time. It seems to happen only when I follor it at 2500 to 4000 rpm. But from a start, each gear is pulling hard, no hesiation....
what the hell does follor mean??

Hey guys,

I have recently started to drive my car a little hard now that it is broken in. I hate to say this, but I have noticed a lack of power between the 2,500 - 3,500 RPM range (This is in any gear.) The turbo's hits 17 PSI around 2,000 RPM but then drops to 10 PSI when I hit the 2,500 - 3,500 RPM range and there is a noticeable loss in power. I know that the turbo's PSI does not reflect the HP I am actually hitting but I actually notice a loss in power. I hope everything is alright with the car. Any ideas? Thank you!

Jake
I just re-read this and am thinking...you say the boost spikes to 17psi or so. I think what is happening is the PCM is pulling timing and/or throttle because it's exceeding the ~15psi threshold that it's trying to maintain. I notice my car tends to 'fall on it's face' right after a boost spike. Until we get some more detail from the guys digging into the PCM and the electronic hardware that controls our boost levels, this is just a theory. But going forward, try to see what happens with boost when you experience this issue.

My other theory would be burst knock retard. I know the LS1s have a few tables that pull timing on rapid throttle changes. They might have something similar burried in the PCMs for these cars.

what the hell does follor mean??

He misspelled floor. Read the full sentence and it's pretty easy to make sense of what he tried to write.

He misspelled floor. Read the full sentence and it's pretty easy to make sense of what he tried to write.

follor
floor


Who was typing, Michael J Fox?

ROFL! Just heard form the dealer that the car is ready. They have sent the scanned info to GM to analyze. In the mean time they have reflashed the computer and the problem was not occurring. I hope it doesn't come back. Will keep you guys posted.

ROFL! Just heard form the dealer that the car is ready. They have sent the scanned info to GM to analyze. In the mean time they have reflashed the computer and the problem was not occurring. I hope it doesn't come back. Will keep you guys posted.

They may lying to you. Make sure they are really sending the data to the performance division. Also, I have a theory of what may be causing this problem. Read my reply below...



I just re-read this and am thinking...you say the boost spikes to 17psi or so. I think what is happening is the PCM is pulling timing and/or throttle because it's exceeding the ~15psi threshold that it's trying to maintain. I notice my car tends to 'fall on it's face' right after a boost spike. Until we get some more detail from the guys digging into the PCM and the electronic hardware that controls our boost levels, this is just a theory. But going forward, try to see what happens with boost when you experience this issue.

My other theory would be burst knock retard. I know the LS1s have a few tables that pull timing on rapid throttle changes. They might have something similar burried in the PCMs for these cars.

My car also seems to fall on it's face after a boost spike. When I accelerate from a stop, the car never has a boost issue, the problem only occurs when I am accelerating from approximately 2000 rpm. I do have a theory for this crazy problem that is not quite as technical as yours, but may offer some hope for the problem.

I was sitting at a red light last night and I looked to my left at a Honda Civic. The guy was laughing at me (I'm assuming he was doing this because my car sucks compared to his amazing Civic, lol) so I eased into first gear and quickly accelerated through the gear. As I did this, the gas pedal was all the way to the floor at approximately 1,500rpm. The car ran great all the way through the gear but at about 3,500rpm, the wheels broke loose and my car jumped to redline. I was VERY surprised! I did not use launch control and I was not in competitive mode. The traction control was on. Getting to my point, I think that the traction control, although it did not work for me last night, may be causing the car to hold itself back during acceleration. Maybe it is attempting to keep the tires from breaking loose but to us it seems like the boost is being cut and the car is not performing well. This may be a long shot, but it is an idea....

A side note: The road I was on was not wet and did not appear to have paint or any oil on it. I'm not sure why the wheels broke loose so badly.

Jake

I know why your wheels broke loose...260hp did it...damn bastard!

Traction control does cut power...this isn't anything new...

I think the other issue is that we are seeing people on internet forums getting all riled up over nothing. Now you have everyone claiming their car doesn't make any power and blah blah blah...

Group mentalities suck...

They may lying to you. Make sure they are really sending the data to the performance division.

The data wouldn't do shit at the performance division, they need to send it to the ecotec service engineer who will send it directly to Bosch who did all the calibration on the LNF.

The data wouldn't do shit at the performance division, they need to send it to the ecotec service engineer who will send it directly to Bosch who did all the calibration on the LNF.

Sweet, that is what I should have said :). Thanks man...

Jake

SBDBLYS
I sent you a pm to give me a call. I think I can solve your issue.

SBDBLYS
I sent you a pm to give me a call. I think I can solve your issue.

I have the same issue, what is your solution?

I know why your wheels broke loose...260hp did it...damn bastard!

Traction control does cut power...this isn't anything new...

I think the other issue is that we are seeing people on internet forums getting all riled up over nothing. Now you have everyone claiming their car doesn't make any power and blah blah blah...

Group mentalities suck...


It is very easy for you to assume we're getting our panties in a tangle about this issue yet you are not experiencing what we are. The power is not there. The best way to describe it is that you step on the gas and at the same time the brakes are being applied. Don't make accusations without even having the car in question. Hopefully it doesn't happen to you when you get yours. :twothumbs

I know why your wheels broke loose...260hp did it...damn bastard!

Traction control does cut power...this isn't anything new...

I think the other issue is that we are seeing people on internet forums getting all riled up over nothing. Now you have everyone claiming their car doesn't make any power and blah blah blah...

Group mentalities suck...

You do not have any helpful advice for us. Please complain elsewhere. We don't need you in here. Thanks...

Jake

I have sent PM's to three individuals. Since each case may be different I would prefer to work with each one individually until a pattern presents itself. To make a blanket statement as to "this is the exact issue is premature". In fact there may be no issue as it can be caused by a number of things. I have offered help and if and when an exact cause presents I will be happy to share it with you. Because there may be an issue and there may not be.

its confusing. u want to have traction so ur tires stick to the round so u can launch better with no spin, yet comp mode turns it off and gives u more power but no traction which makes u ease into the 1st gear. gay lol

its confusing. u want to have traction so ur tires stick to the round so u can launch better with no spin, yet comp mode turns it off and gives u more power but no traction which makes u ease into the 1st gear. gay lol

I was under the impression that even though it shows that traction control is off on the dash light, it still controls a lot of the traction when using launch control. ??? I thought it was designed to apply as much power to the ground with as little slip as possible. I may be wrong :-/

Jake

You do not have any helpful advice for us. Please complain elsewhere. We don't need you in here. Thanks...

Jake

Jake - go fuck yourself. :lol:

I wasn't complaining...merely stating another possibility. I've seen the group mentality bug run wild on automotive forums before, to the point where everyone thought their cars would blow up and it was based on bullshit. :nono:

I have sent PM's to three individuals. Since each case may be different I would prefer to work with each one individually until a pattern presents itself. To make a blanket statement as to "this is the exact issue is premature". In fact there may be no issue as it can be caused by a number of things. I have offered help and if and when an exact cause presents I will be happy to share it with you. Because there may be an issue and there may not be.

Ah, some common sense comes into the thread...:lock:

The current status of my offer goes like this. Zero, Nada, not 1 individual complaining of an issue has contacted me yet and some of them had a PM with a support offer from me earlier this week.

Makes you go HUM don't it.

The current status of my offer goes like this. Zero, Nada, not 1 individual complaining of an issue has contacted me yet and some of them had a PM with a support offer from me earlier this week.

Makes you go HUM don't it.

How about a long distance call to Michigan to start a conversation that could take a long while ;) I would've called you anyway but I got the car back yesterday. Read on please.

I picked it up from the dealer and this is what the techs wrote on the status sheet:

================================================== =======
COMPLAINT: Turbo system not functioning right. Customer feels lack of power (MJ)

CAUSE: Road tested vehicle with customer. Verified complaint. There is a lack of boost power after shifting into 2nd gear on full throttle. Was unable to locate any loose clamps or leakage at the turbo. Road tested vehicle overnight. Drove on HWY and seemed to be clearing up. Possible might be part of the breaking process. Customer to continue driving until becomes more prominent. Possibly will correct itself.

CORRECTION: No repair at this time.
================================================== =======

I took the car back yesterday and it drove just as well as when I was breaking it in. It is now at 1200kms (I drove it a lot). I really can't say anything else about it, it is driving perfectly. If anything changes I will post immediately.

Jake - go fuck yourself. :lol:


:) You're Nice

The current status of my offer goes like this. Zero, Nada, not 1 individual complaining of an issue has contacted me yet and some of them had a PM with a support offer from me earlier this week.

Makes you go HUM don't it.

My problem doesn't exist anymore. Once I hit about 700 miles I stoped having issues. Thank you VERY much for the offer! If the problem arises again, I will definitaly be in contact with you. I really don't want to have to deal with the local GM dealership on this one. It's a small dealership, which is sometimes a good thing, but in this case it is not. The mechanics are mindless. I have had many problems with them while dealing with my truck.

:) You're Nice


You told me to go away...and that my experience was crap. :thumbsdow

You told me to go away...and that my experience was crap. :thumbsdow

Ya, I'm an idiot most of the time so I don't blame.... I apologize. The group mindset thing is true.

__________________________________________________ _________________________________

:) You're Nice



My problem doesn't exist anymore. Once I hit about 700 miles I stoped having issues. Thank you VERY much for the offer! If the problem arises again, I will definitaly be in contact with you. I really don't want to have to deal with the local GM dealership on this one. It's a small dealership, which is sometimes a good thing, but in this case it is not. The mechanics are mindless. I have had many problems with them while dealing with my truck.

Isn't that nuts??? We both had the same weird occurance around the same time and then it disappears.

OK guys i can accept that. I just want to make sure if your having an issue it gets the proper attention. I am working with one individual on his issue as we speak.

If your issue returns PM me.

OK guys i can accept that. I just want to make sure if your having an issue it gets the proper attention. I am working with one individual on his issue as we speak.

If your issue returns PM me.
Are you onsite at the Tech Center or MPG by chance?

Isn't that nuts??? We both had the same weird occurance around the same time and then it disappears.

Ya, it's crazy. Part of the break in process I guess. We seem to be the only ones anal enough to complain about it. Or we are pushing our cars too hard too early :-/. Anyway, the car is running great now. I want an intake and I hope that GM comes out with some stage kits. This car is a lot of fun!

its def the gas...... i have 1800 miles on my car
i have had 91 and 93 in it on a very long trip 600 miles and 600 back, the 91 seems to require a speed shift to pull full boost in what ever gear follows

side note i get 37 mpg @ 70 mph with 91
30 mpg @ 70 mph with 93

sspdmon
affirmative.

its def the gas...... i have 1800 miles on my car
i have had 91 and 93 in it on a very long trip 600 miles and 600 back, the 91 seems to require a speed shift to pull full boost in what ever gear follows

side note i get 37 mpg @ 70 mph with 91
30 mpg @ 70 mph with 93

Right...

sspdmon
affirmative.
We may have to grab lunch some day. :) I'm over in the Cadillac building.

I had the same issue as described this morning. I haven't noticed it before because I haven't driven in hard at all for the first 600 miles.

Today, I was in second and then floored it.. The car started to accelerate, then stopped accelerating. Almost felt like it was going to stall. I was not very happy :(

OK guys i can accept that. I just want to make sure if your having an issue it gets the proper attention. I am working with one individual on his issue as we speak.

If your issue returns PM me.

thanks for your help. car is fixed. I would def. recom calling this guy. he knows his sh*t.
:cssNET:

I had the same issue as described this morning. I haven't noticed it before because I haven't driven in hard at all for the first 600 miles.

Today, I was in second and then floored it.. The car started to accelerate, then stopped accelerating. Almost felt like it was going to stall. I was not very happy :(


Give it a couple of days, keep giving the car some throttle and see if it goes away like it did with ours. Mine is driving perfectly, the problem lasted under 48 hours. Let us know what happens!

There are two distinct issues that can cause this issue. GM Technical assistance now knows what the deal is. Because it could be one or the other I recommend that you take it in if it is a consistant reoccuring issue and ask them to call TAC about it. At this time thats where it stands. ON some cars it shows its face and goes away and never returns. On some it shows up and stays until one of the two possibilitys is corrected. Unfortunatly there is no blanket answer like "fix this it will go away" Because it could be 1 of 2 issues or it maybe a fuel contamination issue. The service issue identified are for radical boost control issues

If your not using premium fuel that can also cause issues. If you take your car in for this issue make sure it has premium fuel in it and it is a reproducable issue.

Vernon if you want to pass on what was done to yours thats your perogative, because in all reality your issue has a simple solution that can be done in the driveway

Vernon if you want to pass on what was done to yours thats your perogative, because in all reality your issue has a simple solution that can be done in the driveway

Please do... :twothumbs

I will give it a couple of days with driver harder to see if it still occurs

There are two distinct issues that can cause this issue. GM Technical assistance now knows what the deal is. Because it could be one or the other I recommend that you take it in if it is a consistant reoccuring issue and ask them to cal TAC about it. At this time thats where it stands. ON some cars it shows its face and goes away and never returns. On some it shows up and stays until one of the two possibilitys is corrected. Unfortunatly there is no blanket answer like "fix this it will go away"

If your not using premium fuel that can also cause issues. If you take your car in for this issue make sure it has premium fuel in it and it is a reproducable issue.

Vernon if you want to pass on what was done to yours thats your perogative, because in all reality your issue has a simple solution that can be done in the driveway


Just to make it clear, when you say premium fuel, you are referring to 91 octane, correct? I've been putting 91 in since day 1.

yea 91-93

well I have driven it for a day now and the car is starting to get the hesitation back or rather it wants to fall on its face at full boost. I even moved the bypass off the intake and it still is not acting right. its better but still not right.

Wait, you started changing around components?

Wait, you started changing around components?


Of course...he is the boostking...he his the top technician at a Nissan dealership...and a specialist on the GTR...he really knows his shit! :lol:

Of course...he is the boostking...he his the top technician at a Nissan dealership...and a specialist on the GTR...he really knows his shit! :lol:

please go e-thug somewhere else.

Wait, you started changing around components?

some of the ss/tc may have a concern with the boost bypass leaking due to the vib. from the engine because its on the intake manifold. mine acted as though it was the bypass and a repair was performed and helped for a little while and now the concern is showing up again. myself and GM (Gettinausernamesucks) are trying to figure out what is going on and once we do we can then say yes your can has this problem here is the fix or no you have another problem. there is no deff. fix at this time that is why there is so little info. nor do we know if all the concerns are related. but those in the know are trying their very best to find a fix. everyone will be update when info is aval. but we are in the diag stages at this point. :cssNET:

I would prefer that you go feed your bullshit to some other forum...

My engine doesn't vibrate that much...

I would prefer that you go feed your bullshit to some other forum...

if you wish to be an ass please pm me. the post above are facts inwhich can be back by bill hahn and Gettinausernamesucks who is a gm engineer.( in regards to the boost bypass and how to work around it.)

My engine doesn't vibrate that much...

that doesn't mean you don't have the problem or that you do. again once there is a fix myself or Gettinausernamesucks will be more than willing to post what was found.:cssNET:

Let him post the information then, because you do an absolute terrible job explaining just about everything.

Let him post the information then, because you do an absolute terrible job explaining just about everything.

there is no info to post at this time other than we are diaging the concern and we will keep you posted. I would not have to explain what was going on (which is nothing more than diag at this point) if you would stop e-thuging every thread you post on. (I am not the only member that has had enough of your line of bullshit posts that are not even about the thread nor do you own a 08 ss/tc. please stop post whoring and leave those with a little insight on whats going on alone.):cssNET:

there is no info to post at this time other than we are diaging the concern and we will keep you posted. I would not have to explain what was going on (which is nothing more than diag at this point) if you would stop e-thuging every thread you post on. (I am not the only member that has had enough of your line of bullshit posts that are not even about the thread nor do you own a 08 ss/tc. please stop post whoring and leave those with a little insight on whats going on alone.):cssNET:


Every post I make is relevant...

You just happen to suck...:thumbsdow

I wonder what the long and short fuel trims/AFR/Knock sensor are looking like when it does this boost cut?

I wonder what the long and short fuel trims/AFR/Knock sensor are looking like when it does this boost cut?


Get some datalogging software. It isn't terribly expensive.

I'm just saying after 1700 miles not a single problem *knocks on wood*

Get some datalogging software. It isn't terribly expensive.

Im not having any problems myself, it was just idle speculation. I actually have the Aeroforce scan gages in my car, so if this starts happening to me I can watch whats going on.

Im not having any problems myself, it was just idle speculation. I actually have the Aeroforce scan gages in my car, so if this starts happening to me I can watch whats going on.

Well yeah, but it really is much better to have a timed datalog of what the car is doing.

yeah, something you can recall on the computer and look at there is always best, but the aeroforce gauges can record for 60seconds then playback frame by frame everything recorded, so not as easy to analyse, but possible to record/playback.

I'm glad to report Boostkings ride seems to be happy now. It needed some time to relearn it appears after it was repaired. It seems it got pretty lost in its spark and fuel table learns, a battery disconnect was performed and it seems to be good now.

His car had a leaking Bypass Valve solenoid due to a harmonic induced vibration from the engine.

Mine is still doing it.. :(

Take it to the dealer and follow the instructions I provided.

Mine is still doing it.. :(

Keep us posted. I'm very interested because you never know if this problem will come back to bite us.

I'm glad to report Boostkings ride seems to be happy now. It needed some time to relearn it appears after it was repaired. It seems it got pretty lost in its spark and fuel table learns, a battery disconnect was performed and it seems to be good now.

His car had a leaking Bypass Valve solenoid due to a harmonic induced vibration from the engine.

car is still running great! thanks for all the help and can't wait to get her on the track.

my cars has no power at all..... 1900 miles on it
while riding at 70 mph the car stays at 0 kpa and only boost to 30 kpa under full throttle

I have read through the first 5 pages of this thread, and since I am a few days away from tossing a down payment on a new turbo 08 SS, i was getting a little worried, but I know how internet forums are, so I wasn't freaking out to much.

Just my 2 cents from a collective, outside point-of-view. It seems that the same people who were having these "power losses" via boost via SS's turbo came onto this thread to freak out before they even had their car reasonably "broken" in.

What I am say is, computers (ECUs) do take time to learn driving ....Habbits ( not word I was looking for but yall get what I mean)

If you have 150 miles on your Cobalt SS/TC and your noticing funky power bands through any gears like the ones described in this thread, just keep driving until your at atleast 500 miles. Most cars are broken in by then.

But yeah, I noticed that a lot of the original posters that complained about these odd power losses updated us all claiming the problem to be magically solved now that they have 700 miles or whatevs on their engine/car.

P.S. I am not a mechanic or that knowledgeable about engines and shit, but yeah.. basically what I said above *Bong Rips for Jesus*

I just bought a silver SS/TC 3 days ago, and I am having the same problem. I didnt want to get on it because it's new, but when I did, there is a surg of torque till about 3,000 then it falls flat. The turbo is spooled, but it's as if it's breathing through a straw. Then at 4,500 rpm it starts to pull again. It's F$%#ing annoying. My boost doesn't drop below 15psi the whole time, yet it does this. If anyone has found out what the deal is please post. I'm going to look into it, just not through the dealer.

Wow I feel like a dumb-@ss, maby I should read bfore I post?

Keep throttling boys and girls. Let your turbo work. I haven't had a single reoccurrence of the problem.

Bringing this back from the dead. My car has had this loss of power problem before. I read the entire thread, disconnected my battery and the problem went away. That was at around 500 miles. I'm now at 900 and it's having the same problem again. Anyone have any new news on whats going on here? I'm not going to disconnect the battery this time just ride it out and see if it goes away before I take it to the dealer. My dealer will not listen to a word I say when i comes to his car. They look at me like I'm stupid when I graduated from the same automotive courses as most of their techs have lol.

i had a few days of intermittent lost power when it was 80 degrees out, but nothing with cooler ambient temps. Ive got 4k miles and 2nd gear WOT= wheelspin sub 40 degrees

Well it doesn't seem to be temperature related. You give it WOT at low rpms in 2nd the car starts to take off, builds full boost but falls on its face untill about 4k then it picks up again. The first time it happened I thought boost leak but it stays at a consistant 14-15psi. When I reset the computer the problem went away immediatly so it seems computer related. Definatley not wheel spin. It's just how the OP decribed his problem.

Well it doesn't seem to be temperature related. You give it WOT at low rpms in 2nd the car starts to take off, builds full boost but falls on its face untill about 4k then it picks up again. The first time it happened I thought boost leak but it stays at a consistant 14-15psi. When I reset the computer the problem went away immediatly so it seems computer related. Definatley not wheel spin. It's just how the OP decribed his problem.

makes 2 of us :(

I had the same problem right after I got mine. From what I read in the manual it may have to do with how the computer learns during the break in period. Pretty much the same day it happened I went camping so I was able to get some highway miles and by the time I got back it seemed to have cleared itself up. Forgive me for not doing the conversion but that was at about 300kms on the car and I now have 12,000kms on her with no problems. Give that a shot and see what happens.

Bringing this back from the dead. My car has had this loss of power problem before. I read the entire thread, disconnected my battery and the problem went away. That was at around 500 miles. I'm now at 900 and it's having the same problem again. Anyone have any new news on whats going on here? I'm not going to disconnect the battery this time just ride it out and see if it goes away before I take it to the dealer. My dealer will not listen to a word I say when i comes to his car. They look at me like I'm stupid when I graduated from the same automotive courses as most of their techs have lol.

My car did that same strange thing a few times during the first 1000 miles or so, but it went away. If your problem does not go away take it to the dealer. If they cannot replicate your problem with the car they will not be able to do anything about it. It is probably a computer calibration quirk. Your car may be knocking at that RPM though, that would explain the loss of power and boost. My car had 3-4 degrees of knock between 3,000-4,000 RPM that was seen consistantly, after tuning and commanding the computer to go into PE earlier the problem went away.

Thanks everyone I guess I'll just continue to wait it out. It's just so weird, it has plenty of power then on the next start up this happens. I only have 900 miles so I hope that's the problem as others have stated. I was just curiouse to see if anyone had a definate answer because a lot of owners have been experiencing this problem.

I had the problem on an on ramp merging onto the interstate on the way to texas. Coincidentally it was right after I filled up at a gas station. (One that uses the techron additive.) It got so bad my car threw a Missfile CEL,(CYL one) and a Fuel issue call. I stayed easy on it, and burnt through the tank of gas and refueled again. The problem went away, and I cleared the CELs with my reader.

My theory is bad gas. I always 93, and this place I stopped at, was the one Ethanol Free mixture I have come by in a long time. My SAAB 9-3 did the same thing too (EcoPower 2.0T engine) with cheap gas or a big change in the mixture. These frigging gm computers have to relearn how the gas burns apparently, and the fuel tables have to be adjusted. (Or relearned)