2002 Chevrolet Silverado 2500 HD Q&A
2002 Chevrolet Silverado 2500 HD Question: Engine Idle Problem
Been having problems with the truck running rough at an idle for 3 weeks, as well as the service engine soon light coming on. Hooked to diagnostics, which showed cylinder #2 misfire. Changed spark plugs and wires and #2 cylinder coil pack. Truck still ran rough and service engine light still flashed on intermittently. Truck seems to run worse the longer it sits without running. (i.e. overnight or after 2 hours of not running.) No codes are showing up now on diagnostics. Not sure where to go from here with it. - amheeger1976
I would suggest you continue to diagnose for a misfire condition at idle on your 2002 Chevrolet Silverado. There are a number of items you have not addressed which can cause the engine to misfire - compression loss or fuel injector issue for example. A scan tool would be of help to try and determine if #2 cylinder is still causing your misfire. If you have reached the end of your diagnostic ability and find you need the help of a repair shop please use the following link to find one near you - http://repairpal.com/directory?address=41015&car_brand_names=Chevrolet. - Oakman
A dirty throttle body may cause a lower than normal idle and possible stalling condition. Performing a throttle body service will commonly correct this concern.
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To get idle down. No check engine light. No codes showing up.