91 2500HD Pickup Idle Problem.
Put a vacuum gauge on the engine if it read between 18-21 and is steady your timing chain is good. Or pull the dis cap off and turn the crank while looking at the rotor. If you can move the crank back and forth with no movement of the rotor the chain has to much slack. Set the engine up on tdc and make sure the rotor is pointing at #1 on the cap
Another thing I noticed is that I can smell some exhaust up by the engine. I don't have a leak anywhere do you think a bad O2 sensor could be causing the exhaust to run back up through the Throttle body?
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Thermool
Silverado, Sierra & Fullsize Pick-ups
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Jun 20, 2009 6:41 PM




