ok got car back from shop. New intercooler on, but still losing boost. The recirculating BPV looks shitty, could this be causing it?

 

You would loose some boost due to the I/C's larger core.

 

its stock IC. the boost flutters between 7-14 psi during mid rpm range throttle

 

Hmm, could have a boost leak. Piping not on all the way. And the BPV could be the culprit but I doubt it sounds more like a boost leak

 

man, i just got the car back. It wasnt doing this immediately after I got the intercooler smashed in. about a week after I noticed it on the highway really bad in 4th gear. put the car in the shop and assumed it was the smashed intercooler. got the car back. Its alittle better now but still does this fluttering thing..in 3rd, 4th, and 5th is god aweful

 

Tighten all 4 clamps, check hoses from to BPV, MAS, etc. Should only take like 5 minutes to check and see. If its a big enough leak it would throw a code, so it could be very small. If you smashed in IC, u might want to check the CP on each side of the IC, could have slightly nicked the plastic. I did it on mine, but mine was big enough to throw code. Also check the hose going from the cold side piping to the MAS. Hose could have hit fan or shroud, check for rubbing. This also happened to me, can easily reroute hose if thats the problem.

 

ok so I think I checked all the clamps and they seem really secure? Weird? the best way to describe this is when I floor it in either 3rd,4th,5th gear... The boost guage will start to rise and when it gets near 13psi, it drops to 6psi and then trying building again and then drops again. If I run the car hard and get near the redline then shift so boost is already pretty much full from a 2nd gear pull then I maintain 13-14psi (alittle low to me) through out 3rd and 4th gear.

I dunno, can someone take some photos for me of all the things I should look at? I mean I think they would have noticed this?

I think it seems like a big leak cause I loose that much boost, not sure why no codes are being thrown.

 

This car will rapidly misfire and not throw codes

Are you sure it is boost related?

How many miles do you have on the plugs?

 

the car has 4400 miles on it roughly, and no codes are being thrown. That's why im asking whats going on with my boost? lol. When I floor it from low rpm's pretty much in any gear that car basically ***** itself and the Nissan Versa does the ricer flyby. lol. feels like it looses all power on the high way flooring it in 5th gear. I was watching the boost guage and noticed that it made huge extravagent fluttering motions from 13-14psi which to me seems low to 7psi. As the boost built up the car started to feel like it was about to accelerate but then the boost drops and it slows down.

 

Modifications?

 

none

 

It could be the "nipple" for the turbo wastegate actuator. I would think it would throw a code, but I imagine it could be defective without throwing a code. If its not a boost leak at the piping, and sensors are good, and you havent overspun your turbo because of some "high power" tune, this is my only conclusion.

http://www.sandyblogs.com/techlink/2...r-damaged.html

^^^A good link to it.

 

wow thanks! Thats the kinda assistance I was hoping to find on here! Im going to call the dealer and give him a list of my ideas and then let him handle it. hopefully it has nothing to do with the damage I took earlier and it just happens to be a warrantied item that needs a look at.

 

ok, soooo! didnt bring the car in yet but I noticed something strange... I realized that the boost problem only occurs when I slam my foot on the gas in 2nd, 3rd, 4th, or 5th gear. BUT, if I push on the pedal slowly till my im pedal to the metal, then the boost is fine???? reaches 14-15psi??? whats going on? is this a ECU problem or still a boost leak thing?

Can anyone try flooring it for me in 3rd,4th,or 5th gear and see if they experience this too? Im starting to convince myself that the car is ok and it's all in my head, lol.

 

Just take the car in bro. If youre stock and theres a problem GM will warranty it. I can floor mine in any gear and the boost rises to 15 immediately until about 5K RPM then rises again to 17 PSI until redline.

 

awright thanks for the double check. I thought I was able to do that. cars gonna go in next week.

 

I have an idea. Check the hose going from the cold side charge pipe to the MAP. It would be directly behind the radiator fans. Very easy to spot. Work you fingers down the rubber hose and see if the hose has a slight "rub" mark on it. The hose may be rubbing the fan shroud. If so all you have to do is take some needle nose pliers and pull the clips off of each end and replace.

EDIT-Also check the actual charge pipe itself on the cold side, could be rubbing the mount bracket bolt too. And did you check ALL 4 clamps on the piping? or just the 2 that are visible? 1. Turbo-CP 2.CP-IC 3.IC-CP 4.CP-Manifold

 

maf sensor wiring ??

 

another update, decided to lift the car up and take a good look. Found that the charge piping from the turbo to the IC did have a gap big enough for my finger to fit in. Took care of that by getting a second clamp and tightening it over the gap. Car ran slightly better I could tell! But Still having the same issue, definately didnt see any spaces or loose connections with the other three locations. Havent tried checking the tubing near the fan shrouting yet by the MAp sensor. Will do tomorrow if it isnt raining at the cecil county drag way. Will post pics of what I found soon.

 

checked tube that plugs into the plastic nipple on the cold side Charge piping, BINGO. The tube wasnt even in place. It was just dangling there and the plastic nipple was snapped off and stuck in the hose. So I have a bee-bee size hole in the charge pipe right before the MAP sensor and the vacuum line isnt in place. that would explain funny throttle response AND loss of boost.

 

I had the same thing happen to my stock piping, and really didn't notice any real boost loss.

That hole is like 2 MM wide

 

well I noticed most of the boost loss because the Charge pipe wasnt mounted right. there was a good gap. I get over 14psi now, but it lags funny and throttle flutters in 3rd,4th,5th gear probably from this vacuum line. Ontop of that it wont let the boost reach its max stock output sometimes because of this vacuum line not in place. That is my theory. Just need to replace it I guess. Gonna bring it to the dealership monday.

 

Describe your throttle fluttering?

As in, you floor it and it skips a beat?

 

IF I floor it in 1st or 2nd gear, the car oeprates fine to my senses... In third gear you notice alittle hesitation as though I hit some sort of limiter but at 4500rpms usually. Then in 4th gear, the throttle may even flutter meaning accelerate quickly then slowly then quickly, etc.. Then in 5th gear it does what 4th gear does but worse. As the throttle flutters like this, the boost guage also flutters from 7-13psi. It will start to climb to 15psi but never make it. When it hits 12-13psi, boost pressure drops to 7-10psi then tries to climb again, and then drops.

 

Check your plugs.

You're misfiring.