Jprice90 Posted August 2, 2011 Report Share Posted August 2, 2011 not all the time, when im at a light, the RPMS will dip a little bit and come back up, sometimes if im lucky it'll do it twice, i was thinking maybe plugs/wires? but i heard the back plugs are a bitch Quote Link to comment Share on other sites More sharing options...
Money for Nothing Posted August 2, 2011 Report Share Posted August 2, 2011 Do any dash lights flicker? Quote Link to comment Share on other sites More sharing options...
Jprice90 Posted August 3, 2011 Author Report Share Posted August 3, 2011 it's daytime when i do most of my driving, its probably something stuff, it would be nice if it was the plugs, no idea how old they are, the old lady had em done, but god knows how long ago Quote Link to comment Share on other sites More sharing options...
Money for Nothing Posted August 3, 2011 Report Share Posted August 3, 2011 Sounds like it's time for them, then Quote Link to comment Share on other sites More sharing options...
Mel87 Posted August 3, 2011 Report Share Posted August 3, 2011 Does the car idle rough? Quote Link to comment Share on other sites More sharing options...
Jprice90 Posted August 3, 2011 Author Report Share Posted August 3, 2011 doesnt run rough at all..on a cold start, after maybe 30sec of running, it will jump RPM from say 1K to like 1200, which is weird, after a few seconds it will fall back to 1K, pretty weird, other then that, runs fine Quote Link to comment Share on other sites More sharing options...
rjOlds Posted August 3, 2011 Report Share Posted August 3, 2011 Its possible you need to perform the idle learn procedure, if the battery has been disconnected or discharged. There are two ways to do this, one is someone with the GM Scan 1 tool (anyone know where you can get one of these?), or try the procedure in this post: http://www.w-body.com/showthread.php/14921-Idle-Relearn-Procedure?highlight=idle+learn I'm no expert but other possibilities could be needing to clean the throttle body, maybe replace the fuel filter as it might be partially blocked. Check if the idle motor vacuum line (if it has one) is cracked/worn or broken. Does the car hesitate at all under heavier acceleration? What is the car/year/motor? Quote Link to comment Share on other sites More sharing options...
Jprice90 Posted August 3, 2011 Author Report Share Posted August 3, 2011 my throttle body is clean as a whistle, fuel filter is a few months old, wheres the idle motor vac line? 95 Lumina, 3.1..runs excellent when gassing, just sometimes runs weird at a light Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted August 4, 2011 Report Share Posted August 4, 2011 did the rad fan kick on? Quote Link to comment Share on other sites More sharing options...
Jprice90 Posted August 4, 2011 Author Report Share Posted August 4, 2011 no, when the fan comes on it doesnt cause it to run weird, it WILL drop the rpms, but not cause it to run different..im gonna see if i can get to the back plugs and take one out to see how it looks, one from the front and one from the back Quote Link to comment Share on other sites More sharing options...
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