Rough idle around 1000 - Update 1/16/08, Wasn't PCM.
#11
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Ok, did some diagnosing today.
1. Removing the brake booster line and capping it did not make any changes.
2. No vacuum leaks present, checked. Plus the idle was rough before me and petraman even touched the engine when he owned it.
3. No awkward noises except for the belt squeak I have.
4. On another note, when I do go WOT sometimes, I get a awkward smell out of the exhaust. Really can't explain the smell, but I am being told that the smell is normal on forced inducted cars when going WOT.
5. Should I pull my belts off for a few seconds and see if the idle changes?
Any help would be great, the roughness to it drives me nuts as it shakes everything in the car. :(
1. Removing the brake booster line and capping it did not make any changes.
2. No vacuum leaks present, checked. Plus the idle was rough before me and petraman even touched the engine when he owned it.
3. No awkward noises except for the belt squeak I have.
4. On another note, when I do go WOT sometimes, I get a awkward smell out of the exhaust. Really can't explain the smell, but I am being told that the smell is normal on forced inducted cars when going WOT.
5. Should I pull my belts off for a few seconds and see if the idle changes?
Any help would be great, the roughness to it drives me nuts as it shakes everything in the car. :(
#14
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Little update. Lately it has seemed to ever so slightly smooth out, and idles at about 975-980 now. I still have the "unstable" idle though. I was being told that my IAC may be going bad, but I am absolutely sure that a bad IAC will only cause a high or low idle, not rough. Needless to say, I am afraid to spray starting fluid around certain areas to find a vacuum leak. And this is coming from a kid that used to play with starting fluid torches.
#18
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This may be way out there...or totally irrelevant.... but could it be the MAF sensor? Mine went bad and monkeyed up the idle and it ran rough while driving. It didn't make it idle high, but that doesn't mean it couldn't. MAF'* are expensive and require a special star scredriving to take off. If you could try one (from another good-running car), it would be interesting to know if it makes a difference.
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Well....... you just may be on to something. I never really check to see if it was the MAF, but it'* very possible. What readings should I be seeing on the scantool?
#20
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I never really mentioned this, but I do also have hard starting when first starting in the mornings, sometimes it happens, sometimes it doesn't. Fuel pressure is in spec also.