View Full Version : RPM flutter, drop out at idle when coming to a stop


dawhit99
12-14-2007, 07:47 PM
I may not be wording this right but couldn't find it with search.

I just had my car at the dealership for an oil change (its too cold out to do it myself) and on the way home, when I was coming to a stop with the clutch in, the rpm's kept dropping out and then bouncing around. It felt like the engine was about to die. I've noticed this a couple of times lately and it's beginning to piss me off. 39K on the car so of course it's out of warranty now so this sucks. I'm not going to do anything about it right now but has anyone else had this happen to them? No mods on the engine.

NWAE Cobalt
12-14-2007, 07:51 PM
mine has done this a few times...can never figure out what it is...i have cai..

dawhit99
12-15-2007, 12:01 AM
Has it ever died on you or just almos?

joddypoo
12-15-2007, 12:43 AM
I've also had this happen both before and after CAI. Mine's never died from it though.

CJ BadBlackSS
12-15-2007, 01:32 AM
this happened to me when i first got the car. stopped after they upped the idle RPM slightly. Its a TSB so a reflash will fix it.

it happens more often now with a tune. something about messing with the stock tune affects this...especially when its cold out

streetrcer909
12-15-2007, 01:34 AM
ya mine does this when its cold out. you said a tune will fix it? will this be covered under warranty even if i have a cai?

cobalt blue
12-15-2007, 01:42 AM
I had the same issue with my 07 SS/SC. I have an Injen CAI, I brought it to my local dealership, they reflashed my ecu and problem solved. Didnt say anything about the CAI.

lsjwannabe
12-15-2007, 01:42 AM
yeah its a gm tune that bumps your idle up

CobaltVenomSS
12-15-2007, 01:44 AM
i had this problem and got the flash...and i still have the idle problem...it died on me this morning it was so bad

lsjwannabe
12-15-2007, 01:45 AM
oiled filter?

CJ BadBlackSS
12-15-2007, 09:17 AM
hmmm didn't think about that. i suppose the k&n could be the issue...but it ran fine until it got cold out. anything above 50 was good...anything below 50 is bad. high humidity screws it up too.

darksol4life
12-15-2007, 09:27 AM
I may not be wording this right but couldn't find it with search.

I just had my car at the dealership for an oil change (its too cold out to do it myself) and on the way home, when I was coming to a stop with the clutch in, the rpm's kept dropping out and then bouncing around. It felt like the engine was about to die. I've noticed this a couple of times lately and it's beginning to piss me off. 39K on the car so of course it's out of warranty now so this sucks. I'm not going to do anything about it right now but has anyone else had this happen to them? No mods on the engine.


Your car is still under the 60,000 mile powertrain warranty and this would be considered part of that.

dawhit99
12-15-2007, 01:41 PM
Your car is still under the 60,000 mile powertrain warranty and this would be considered part of that.

At least that's a plus. Maybe I'll give this dealership and see if they know about the reflash. How much does it bump up the idle?

yellowltcoupe22
12-22-2007, 10:35 PM
mine had the same type problem but i have a 2.2 auto.. it turned out to be a bad build up of carbon or something in the tb that wouldn't let the butterfly stay open.. it caused it to stick.. i just cleaned it out with brake cleaner and haven't had any problems since..

D4u2s0t
12-22-2007, 10:37 PM
oiled filter?

nope. i get this when it's cold out also, and i have a dryflow aem filter.

thedubsack85
12-22-2007, 10:42 PM
yeah if the flash dosent halp the problem CLEAN YOUR TB... 99% of the time its a carbon buildup on the tb. brake cleaner is ok but make sure car is off.. and if ya want to be really safe take off the TB.. which is NOT a big deal. jus remember to torque the bolt to factory spec. and your fine.
sidenotee if you have oil in your intake get a catch can.

05redline
12-22-2007, 10:45 PM
For those who had the reflash done, what did you idle at before and after?

CobaltVenomSS
12-23-2007, 02:23 AM
yeah if the flash dosent halp the problem CLEAN YOUR TB... 99% of the time its a carbon buildup on the tb. brake cleaner is ok but make sure car is off.. and if ya want to be really safe take off the TB.. which is NOT a big deal. jus remember to torque the bolt to factory spec. and your fine.
sidenotee if you have oil in your intake get a catch can.

whats a TB

Coblt ss super
12-23-2007, 02:27 AM
throttle body, but my car did it since day 1 that i got it, and 40% of the time the car shuts itself off

CobaltVenomSS
12-23-2007, 02:28 AM
me 2 its so damn annoying

Coblt ss super
12-23-2007, 02:53 AM
idk it sometimes seems like the crankshaft is like stuck and is having a hard time spinning. but idk what it is i will eventually figure it out

Onyxd04Redline
12-23-2007, 02:54 AM
Vacuum leak

h0l0caust
12-23-2007, 07:55 AM
i had a reflash and it solved the problem.

stearena
12-23-2007, 02:18 PM
my 06 SS S/C does this at every stop... it died on my once. I took it to the dealership and asked them to reflash it but they said they couldn't duplicate the problem and car has all current program updates WTF!!

Novajoe
12-23-2007, 03:48 PM
mine does this also from time to time. I use nothing but oem parts and I've had all the updates and removed my intake and tb to clean them thoroughly. Still does it. Never dies so I guess I'm not too worried about it. More of a neusance than anything

05redline
12-26-2007, 11:07 PM
For those who had the reflash done, what did you idle at before and after?
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