Engine Idle Problem on 2002 Chevrolet Silverado 2500 HD

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.

by in Latonia, KY on May 05, 2010
1 answer 1 comment
ANSWER by on May 06, 2010
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.
COMMENT by on May 06, 2010
Thanks to everyone who responded to the problem I was having. We have discovered the issue. The air hose running from the air filter to the engine was just loose enough to allow a small amount of air to be sucked in. Also, there was a seperate connection by the #2 cylinder that was not fully connected. We used the diagnostic machine to determine it was located to the #2 cylinder. However the connection was fully connected at times which caused the code to display at random on the diagnostics.
Related Items:
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.
I've been dealing with an intermittent problem that first started 2 months ago. Upon acceleration, at times, I've notice a miss, then surge. This typically happens for a short period of time, then ...
my 6.6l turbo diesel surges at idle and seems to be even worse in reverse. this happens from the moment I start the engine in the morning until i turn it off at night
To get idle down. No check engine light. No codes showing up.

Related Content