Ok so here is my problem. i have an 09 cobat ss turbo. mods al hahn 3 inch cat back exhause down pipes and intake gms1 kit.
nw my problems. its been having prblems ever sense i did these mods to it but they were never so bad as now. so yesterday car started acting funny. constintly backfiring at idle and while acceleraating and decel and shifting. then for some reason the car was stuck at 2000 rpm even at a dead stop the car wouldnt go any lower?
nw today i start the car up and it is haveing a super hard time even holding from 500 to maybe 800 rpm. constintly going up and down at idle. at a cold start even if the clucth was pushed down car wasnt able to stay alive would keep killing itself. after it warmed up it stopped deing but all other problems stayed. horrible backfiring weird smell to it. and can berly idle high enough to keep te car alive. im racking mybrain trying to hink of whats wrong. need help. im going to take it in saturday and yell at the dealer and tell them to fix it and to not give me the bull **** excuss well you now have a metle pipe instead of a plastic pipe take it to installer and fix it. well i instaled them. so does me no good. but i need help if anyone has had these problems or can think of an ideal of whats wrong please tell
oh and engine codes? **** tonshave been popping up as you can expect. but i cant remember off the top of my head what they were

 

Start with listing codes and looking for leaks.

 

Running into the dealer and yelling at them before they even look at your car isn't a very good way to get anything positive accomplished.

 

Start with listing ur codes. Ur dealer sounds like a dick who doesn't wanna bother with it so list the codes and we can help u fix it. In guessing boost leaks and possibly gms1 installed wrong

 

codes...common ones like 101 106 i think 236 missfire codes low idle codes running lean codes i think a 187 or 186 popped up once i think the one last night was a 520 something being wrong with the rev or idle absoult manifold boot pressure i think thats the 236 code o2 code witch i think is the 101 code bunch of other stupid things are popping up but cant remember them. is there anyway my spark plus ould be going bad?
maybe i have a leak in the pipes but if i did it would have been there for a long time as in years cuz i have been having these problems for 2 years just till today it got th extreme.
i kow my pipes arnt loose i had everything tigtened.
im starting to regret modding it. changing the spot where the stock o2 and maf sensor was at and the car freaks the **** out. this is bulshit

 

cant be the gms1 i had it checked twice and even reflashed to make sure it was installed correctly. and reason i would go yelling it cuz its like a weekly thing i bring it in they throw some bullshit exxcuss we cant do anything were not familiar with a metal pipe being on a car acting like dumbies

 

He isn't talking about the GMS1 program, he is talking about the 3 bar GMS1 sensors begin installed incorrectly. That would explain when you're getting a MAP code. Take out one of your MAP sensors and tell me what color the o-ring is. I'll bet you 10 dollars it's blue. If it is, you have the wrong o-ring on there and it's causing a leak.

PS - it's "dying, not "dieing."

 

What color should it be? And does this only apply to gms1?

 

The GMS1 sensors should have a black O-ring.

 

A lot of spelling errors in that.

 

That many misfires could be the injector seals. One or more could be gone and thus compression in the cylinder is being pushed passed the injector...hell, combustion could be making it out of there too...just a thought for something to look into.

 

i thought when you get the GMS1 sensors,the O-rings that come with the sensors are blue,and are wrong. they need to be green i think.

i forget which color are the correct ones.

 

^^ that's a good catch. Are you running e? Or a hell of a lot of boost?

 

Mine are black. I bought them from Joe Schulte, who put the right ones in for me. I don't know what color they come with. My spare one that he was nice enough to include for me is also black. That's all I know.

 

i got ya. i put my GMS1 sensors in the beginning of last summer,they must have changed O-rings or something,i know i had a spare set of O-rings when i was done lol

 

check the passenger side of the intercooler end tank.

 

Obvious vacuum leak is obvious.

 

I was thinking the same thing. Car is probably running pig rich from a massive leak.

 

Im gonna throw this out there. Switch the HAHN intake back to the stock intake, reset the ECU and see if the problem goes away.

 

236 is for lower MAP sensor. Mine was coming unplugged and causing that code.

My bet is on a boost leak. Good luck OP, clear your head and take a smart, straight forward approach and give us as much info as possible. We will help.

 

Why u mad at dealer? U installed the parts and have had problems for two years because of it. Now that the problems are worse why should dealer fix it? Either troubleshoot it yourself or take off the aftermarket parts and let the dealer fix it.
Lots of good info posted on where to look. The only other thing I might take a look at is to make sure that if your gms1 doesn't have the plug and play harness that they soldered the gms1 connectors rather than just using the crimp ons. Bad things can happen as those connections deteriorate due to vibration and weather. The idiot at gm who signed off on using crimps should be shot.

 

seriously. The gms1 tune will not run intakes like magic. Intake should be tuned for. Please put your stock intake back on, reset (unplug batery for 5 mins) and let us know if the problems gone.

 

Just put on K&N. Already had GMS1.

Car went from -1.5 LTFT to about +3.5

What are people seeing with other intakes?

 

K&N is a different story, pretty much every other intake ever made for our car cause lean codes or rich codes. MAF has no clue whats going on.

Swap the intake out OP. See if it fixes it.

P.S. to get a rich or lean code, your LTFT would need to be at or above +/-18.0% (I believe might be 16.0%).

 

happened to me, gm has a bulletin about this. the lower map sensor rubs on the ac unit or line and causes it to ground out and results in a lot of BS. check that out just take off the front bumper. if someone told me this it would have saved me a lot of headaches, years of my life taken due to stress and $1000