Intermittent Poor Idle - LT4
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
Intermittent Poor Idle - LT4
The last couple of weeks my 96 has been dipping a bit (to around 500 rpm) before rebounding when I put it in neutral.
The last day or two it is now intermittently (seems to happen when warmed up to operating temp) has exhibited a generally crappy idle. When this happens the exhaust fumes become noticeable in the cabin.
My initial thought is a dirty or failing idle air control valve (IACV). And the car has not thrown a check engine light. Thoughts?
The last day or two it is now intermittently (seems to happen when warmed up to operating temp) has exhibited a generally crappy idle. When this happens the exhaust fumes become noticeable in the cabin.
My initial thought is a dirty or failing idle air control valve (IACV). And the car has not thrown a check engine light. Thoughts?
Safety Car
Joined: Dec 2007
Posts: 3,616
Likes: 5
From: Sandhills of North Carolina
Just out of curiosity what brand 02s did you get? Bosch do not seem like the OBDII of the '96 very much at least not for very long. Delphi or ACDelco are best and I've even had problems with them on my '96. Right now I'm using Denso's and so far so good. Also a exhaust leak before the 02s will make your car run rich causing the smell in the cabin. A vacuum will also.
Last edited by Weav's Vet; Sep 11, 2010 at 03:52 AM.
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
All of the sensors were replaced with ACDelco parts. The car finally threw a code and it turned out to be a defective O2 sensor. It was replaced under warranty at no charge...
That is the good news, the bad news is a rock broke my windshield on the way to the shop.
That is the good news, the bad news is a rock broke my windshield on the way to the shop.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Sounds like my luck. what next
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