This isnt my car. My friend recently bought a 06 SS with about 33k on it. In the last few weeks she has been experiencing problems, of which i have no witnessed firsthand so im going on what she says.

Sometimes on starts the car will barely want to turn over and when it does it idles really high then drops to like 400, almost stalling, then back to high. Back and forth for minutes at a time. Boost and Vac bouncing as well.

Car will also do this when driving normally. Loses power and does the same crazy idle jumps.

From what i can tell she is GM stage 2. 4bolt 77.9m pulley and injectors. We took it to a dealer and they reflashed the pcm which seemed to work for about a week, but it seems its back now.

Please help her out with some ideas if you guys could

 

mmmmmmm maybe clean the throttle body, make sure all your boost lines are hooked up properly, and vacs the same, make sure all the sensors are plugged tightly also

 

Its in the tune, mine did the same thing after the dealer flashed it with stage 2, car kept acting like it wanted to die. I retuned with a 2.8 pulley & had zero issues since then. Find a local tuner & they should be able to get rid of it.

 

i should mention she bought the zzp pcm because even tho i noticed it was stage 2 the car wasnt boosting past the limiter. After she installed their pcm, these issues crept up a few days later, leaning towards a crankcase relearn. then we took it to the dealership with the original pcm in and they flashed it.

 

i would almost say dirty maf sensor or throttle body. kinda sounds like the car wants to choke itself to death

 

are you sure the dealer didnt flash it back to a stock tune not a gms2

 

I still say it's in the tune, these were issue's we delt with almost 5 years ago.

 

i highly doubt its the tune. When they reflash the new tune on the pcm it has no leaning once started , once it get to operating temps itll get ltft running and itll save wut it see so if the pcm says its needing 15 or -15 stft and 4 ltfts and -12 ltft itll save it for next start up and so on and so forth, so i doubt the tune is the issue, somthing is making the tune go to crap either a boost leak, a bad or dirty maf, bad gas which is good possible, bad fuel pressure, dirty injectors, ect

 

Here read these threads it might help you & yes it was in the tune, Like I stated I had a GM stage 2 put in by the dealer & it did the same thing, after a Retune no more problem!

https://www.cobaltss.net/forums/2-0l...surging-62003/

This read down it, search is your friend>
https://www.cobaltss.net/forums/prob...roblem-127086/

Heres another
https://www.cobaltss.net/forums/prob...have-fix-9178/

 

Weak Battery, or Loose Electrical connection on the battery / starter ?

Dirty Throttle Body

VERY Dirty Throttle Body

 

i agree w/ the tune, plus mine did that as well... my pcm and tb both had to be replaced, under my EC federal warranty, which she still has, i have an 06 SS Sc as well, and mine would act up until it got to operating temp. i took it to the dealer they cleared the 8 codes i had it worked for about 6 hrs then went back to ****... thats when they decided to replace them all... but if your confident the pcm and tb arent the prob, then id say take bby steps and check all the other ideas...

 

bro only way it could be a tuneis if it didnt havea full write. explain to me how a car will run great but after a weeks time it started happening. ISSUE its learning, second issue possible, dirty t.b, wrong injectors tables but as stated, it would do it on first start up. gm can put the stock file on the car with gm stage to crap which will give his issues, but itll start straight from tnhe get go.

 

btw just because you see a thread made previously for close to this same issue, the op states it happens after a weeks time after the reflash.

 

My three ideas are inexpensive and easy to correct. Why not do the easy stuff first then the more complicated stuff?

 

i say, diag first. so like cleaning the t.b is part of the diaging, so wut id do is get some brake cleaner spray on all piping for the s.c including near the maf sensor, clean the air filter, clean the maf if it is still good, tighted the intake tubing, clean the t.b if you cant diag.

 

this site cracks me up


BUY A MAF BUY A MAP GET AN ECM TRADE THE CAR!!!



clean the tb, and see if there are any OBD codes up

I'm willing to bet its something in the idle circuit.

 

i had a similar problem a couple months back. the car hesitated on start up, and the rpms bounced a lil bit untill it got settled. about a week after the problem occured i blew the ignition fuse, replaced it, and everything worked perfectly.

 

Throttle position sensor is my guess.

 

since we are all guessing and not diaging i say its the damn key fob.

 

rotflmao.....:l ol:


Having dealt with a car having pretty close to the same issue...
This was a 07 SS with new 2.8, and 60's, With a brand spanking new base tune for the mods.
This car experienced this from the get go of the mods and tune. (The car showed slight signs stock but it didn't really show itself until the mods came)
Upon checking the filter, it was badly clogged and dirty, upon checking the maf it was kind of funky as well, upon checking the TB it was VERY dirty.
So, what fixed it?
Well a number of things, of course, we cleaned tb, maf, and got a new filter, the car would now hold a idle, but it was a bit up and down up and down.
I went in to hptuners and reset the fuel trims, car idle went down to normal and no more hopping.
Some modification to the tune did come later but that was to make the car idle a bit lower then it was.

So I would, check airfilter, maf, and TB, clean them all and if you know someone with hptuners, reset your fuel trims.

Now if you did get a ZZP pcm, and not just the tune, then it would need a case learn...
Correct me if I am wrong, but even if GM re-flashed the pcm it would still need a case learn!

Ok so this is my 2 cents... take it as you will....

 

i had that problem when my injectors were not working properly

you can also try to see if any cylinders are misfiring

 

She bought the car with the pulley and injectors. Car wouldnt boost past 12. So i reccomended a zzp pcm tuned for 42s. After she installed. The problems occured. So she put the original pcm back in and we toom it to the dealer. They reflashed that pcm. She made 15+ after they flashed it. Im in the fueling/ MAF failing group. But its hard to work on it in 20 degree temps and 6 feet of snow all over

 

Is there another way to do this?

 

yes take the connectors off the ecm, all three id leave it off for about 20 mins to verify all is reset.

 

Just unplug them from the PCM and that's all? Fairly easy. I was always told to pull the negative cable from the battery but then I also read that doing it that way will not clear them.