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View Full Version : Need Help! My Car idles rough in drive and park.

ShowtimeSteeleLS1SS
02-11-2009, 09:14 AM
My car runs rough from time to time in idle when in drive or park. No check engine light Ever! other then that the car runs great . When i start to accelerate its a little choppy especially after the car has been running for a good bit and when its either hot or humid. then after i get past 12 1300 rpms then it's back to normal. I think it might be an EGR problem but im not sure at all. Can someone help?

My Car
1999 Camaro SS LS-1 346ci ALL STOCK
67,000 Miles

I purchased it with 60,500 miles and have owned it for exactly 2 years.

Thanks in advance!!!
JL8Jeff
02-11-2009, 10:28 AM
I have a Diablosport programmer that can scan for codes and watch some of the sensors while it's running if you want to check the car out. I actually have a spare EGR as well if you wanted to try it for testing.
ShowtimeSteeleLS1SS
02-11-2009, 10:31 AM
yeah that would be great actually!

have you heard of this problem before?
JL8Jeff
02-11-2009, 10:57 AM
It sounds similar to an EGR problem but could be something else like plugs or wires. My car ran like that after I did the header install and forgot to put plug wire #8 back on the plug! :mrgreen:
ShowtimeSteeleLS1SS
02-11-2009, 11:00 AM
yeah, just weird cuz i have no mods
SuperSweet
02-11-2009, 12:10 PM
pull a plug out and see what they look like...the car may have sat for a while before you bought it and could have fouled plugs.
KirkEvil
02-11-2009, 12:11 PM
The sensors in the MAF might be dirty, or you need new plugs. When is the last time you changed the plugs if ever?

It might also be a shot O2 sensor, but I think you would throw a code for that.
ShowtimeSteeleLS1SS
02-11-2009, 01:50 PM
thanks guys def appreciate your help , if anyone has anything more to add please let meknow
maroman88
02-11-2009, 03:19 PM
i have the same prob... only happens at low idle and when the cars hot. like at a stop light it will lurch forward and the settle down.... weird
ShowtimeSteeleLS1SS
02-11-2009, 04:12 PM
thats EXACTLY my problem !!! GRRRRR
CHRIS67
02-11-2009, 04:33 PM
Choke issues?
Tru2Chevy
02-11-2009, 05:13 PM
Does the check engine light come on when you first start the car? If not, then the bulb is prolly bad you may actually have codes.

- Justin
ShowtimeSteeleLS1SS
02-11-2009, 05:15 PM
the check engine light does come on
maroman88
02-11-2009, 07:08 PM
yes it does... has never thrown a code either
JL8Jeff
02-11-2009, 07:17 PM
the check engine light does come on

If you want to stop by one day we can check the car out on the scanner. I'm on the border of Ewing and Titusville so I'm not that far from you.
ShowtimeSteeleLS1SS
02-11-2009, 08:22 PM
If you want to stop by one day we can check the car out on the scanner. I'm on the border of Ewing and Titusville so I'm not that far from you.

that would be awesome! thx , im going to put the car back on reg insurance pretty soon and when i do ill def do that.
ShowtimeSteeleLS1SS
02-11-2009, 08:23 PM
when i said the light comes on i just meant at start up then turns off, so i dont know if the scanner will bring anything up.
JL8Jeff
02-11-2009, 09:14 PM
If there are old codes they might still show up. And if there are any not ready conditions they will show up as well.
ShowtimeSteeleLS1SS
02-25-2009, 08:42 AM
bump
ShowtimeSteeleLS1SS
02-25-2009, 03:42 PM
for those who said there take a look at it or scan it i just got my car back on the road today so whenever any of you can let me swing by the would be great! the sooner the better .
Thanks
JL8Jeff
02-26-2009, 07:55 AM
If you want to stop by after work one day or over the weekend we can scan it and you can try swapping the EGR if you want to see if that eliminates it.
ShowtimeSteeleLS1SS
02-26-2009, 07:30 PM
If you want to stop by after work one day or over the weekend we can scan it and you can try swapping the EGR if you want to see if that eliminates it.

yeah just let me know im available anyday, what is ever best for you. The sooner the better though. Thanks appreciate it
JL8Jeff
02-28-2009, 03:32 PM
Hopefully that vacuum leak was the only problem. How was it running after driving it home and giving it a chance to clear itself out? It was interesting watching the computer try to compensate for the extra air getting in and then going into limp mode to balance it back out. I'll look for the replacement pcv valve part # I grabbed for my car.
ShowtimeSteeleLS1SS
03-01-2009, 12:22 PM
Hopefully that vacuum leak was the only problem. How was it running after driving it home and giving it a chance to clear itself out? It was interesting watching the computer try to compensate for the extra air getting in and then going into limp mode to balance it back out. I'll look for the replacement pcv valve part # I grabbed for my car.

it seemed to be running better for sure!! Thanks alot i appreciate it! alright yea let me know if your find the part #