At the beginning of the month the car was acting funny and losing coolant, took it to dealer and long story short engine ended up being replaced.

Well i picked it up and everything runs great except for one thing, the car has GM Stg 1 and before only boosted to 5psi in 1st gear but now with the new engine it will boost to 20psi in first, am i looking at a new problem? or nothing to worry about? do i need to take her back to the dealer and get Stg 1 re-flashed? thanks for info in advance.

 

almost sounds like they didnt reflash GMS1. Not sure though i dont have an LNF.

 

I know it still has the GMS1 because i'm still getting 22psi in every other gear just stumped on whats up with 1st

 

Apparently they want you to buy tires faster lol.... Nah I have no idea on this one.

 

They shouldnt of changed the ECM...they would just swapped mechanical parts and only sensors (or put new sensors on the engine)

 

That's one of the strange things with this they didn't do anything with the electronics just put all the old stuff back in.

 

Strange?? My car will pull Damn near 20psi @ WOT in 1st gear. When I'm easy on the throttle, it jumps up to 5psi then back to zero... Which it think is normal. Why would it sound like you have a problem? How are you driving the car When your needle goes up to 20psi in 1st gear? Also, I thought a stock SS/TC was a GMS1? Correct me if I'm wrong plz.

 

GMS1 isn't stock for the SS/TC the 2010 has the option of having GMS1 installed from factory, it goes to 20psi @WOT now but before when i would do WOT in 1st it would go to 5psi and stay there then after the shift to 2nd boost too 22psi, but now after the new engine it will boost to 20psi @WOT. Since it was never doing it before that is why i'm a little concerned

 

That is odd.

They reinstalled GMS1 sensors right?

 

Must be something that happens after u get a new block installed. I just saw that thread u have. Our Balts both have had heart transplants bro! lmao. My car runs fine. Doesn't seem to be anything wrong with it. My Balt is completely stock though

 

yep everything in the car is the same except for the new motor, not quite sure what is going on

 

haha, yea second major transplant my balt has had, had a new tranny at 10,000mi cuz it decided to grenade itself

 

bump, any one got any ideas?

 

does it feel any different? maybe your boost gague took a crap. gms1 should still limit power in 1st gear.

 

GMS1 in first gear is normally limited to about 5 psi, that way you have a chance at getting traction when driving in first gear. I can only imagine how much your spinning through first all the time now? lolll

 

yea getting a little bit of wheel spin the biggest issue is traction during the 1-2 shift, getting a lot more wheel spin than before, every other gear feels just like it did before, 1st is the only oddity

 

What engine did you get, I heard they were low/out of lnf's and have been putting lhu's in them when they crack now?

 

Do you guys beat the hell out of the motors? Lol Mine is basically a commuter with the occasional pull or 2 on friday nights.

 

wait...
are you thinking there's an issue because you can get more boost in 2nd through 4th gears?

you do know that there is torque management and what not which limits power in 1st (and to a lesser degree in 2nd) - right?

because if this is the cusp of your percieved problem - then there is no problem.

umm, sorry.

The stage kit would have at least had to have been reflashed at a service department;
this is, assuming you were to have opted to do the install...

I "built" several cobalts during both the 2009 and 2010 model year - and even the SPO items like all weather mats wouldn't have been installed at the factory... but at the dealer.

It could be that the GMS1 tune was updated.
~ this happens time to time, and isn't always told to the customer;
my brother had the foresight to remove his Caliber's Stage1 ECM - he read that dealers were de-tuning ECM's w/o customer consent;
and low and behold they did it de-tune his stock ECM...

Did you check your service records?
They would (hopefully) state if the ECM (aka: PCM) was reflashed ~ there is a possibility that the reflash also wasn't taken properly - which could have weird symptoms...

just trying to help.

p.s. - IMHO you really shouldn't be bagging the car like that ~ the 1-2 shift is where many people who drive their SS/TC's hard end up breaking something...

 

These threads scare me, people going through motors like its no big deal, MY CAR GETS ME TO WORK! Lol

 

I know what you mean.

I prefer to look at it from another angle;
> Here are problems people are having
>> what's the root problem(?)
>>> then learn from it.

I'm in pretty much the same boat as you - but that doesn't mean I had plans on staying stock... forever.

 

Exactly, all i have on mine is dp and intake. Other than that its a commuter car with the occasional pull on the way to work.

 

1) I am getting the same amount of boost in 2nd thru 4th as before 22psi, never said there was an issue those gears.
The issue now is the car boosting to 20psi in first if i give it more than half throttle where as before the engine replacement it was limited to 5psi.

2) Dealer did not reflash the ECM, doesn't say it on the service record and the tech who did the install said they left all electronics alone and just reinstalled them on the new engine.

3) You are right about the stg 1 being flashed by dealer, i misspoke in my description that it was factory installed, meant it as it was a selectable ordering option if you ordered a 2010 new and that it would have the tune pre-installed on the car when you picked it up from the dealer.

4) I don't "bag" my car but i do the occasional pull and do not NLS 1-2 but when my car is boosting 20psi in first even after letting off the throttle to shift it's still getting wheel spin.

Thanks for the help so far.

 

im running a stage 1 kit but never looked at the gauge in 1st gear...ill have to remember to do that...also are you hitting first gear in normal mode or competition mode?

 

Does it in either mode.