cah77388 Posted December 28, 2006 Report Share Posted December 28, 2006 When the car is started, the engine revs like it should and the RPM's slowly fall to below normal levels. When the RPM gets too low, its as if the engine revs itself back up to keep from stalling. If you let it idle in park it will continue to do this until you turn the car off. When in gear it does the same thing, except its as if the car can't rev itself up, and you can sit and watch the tach. needle bounce up and down between the 300 and 500 mark. The car hasn't stalled yet, but it causes the car the shudder really bad, and when in park you can see the engine jump around as well. It never did this before I took the throttle body and plenum off, and in that process I broke the little plastic tubing that goes from the PCV valve to the plenum....could that be the cause of my problem? Quote Link to comment Share on other sites More sharing options...
IRONDOG442 Posted December 28, 2006 Report Share Posted December 28, 2006 year make model engine ? sounds to me like a TPS or CKP Quote Link to comment Share on other sites More sharing options...
cah77388 Posted December 28, 2006 Author Report Share Posted December 28, 2006 sorry, its a 96 Cutlass with the 3.1 Quote Link to comment Share on other sites More sharing options...
IRONDOG442 Posted December 28, 2006 Report Share Posted December 28, 2006 wrap that plastic piece in electrical tape, do what i call a drop test, unplug random sensors while the car idles and see if the idle smooths out when the ecm goes back to default mode, if that deosnt work, go to autozone and have your obdII scanned. Quote Link to comment Share on other sites More sharing options...
chadz34 Posted December 28, 2006 Report Share Posted December 28, 2006 year make model engine ? sounds to me like a TPS or CKP What's CKP? Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted December 28, 2006 Report Share Posted December 28, 2006 It means crankshaft position, but I'm guessing he means crankshaft position sensor. Quote Link to comment Share on other sites More sharing options...
IRONDOG442 Posted December 29, 2006 Report Share Posted December 29, 2006 yeah all my service manuals call crankshaft positioning sensors ckp because cps is cam shaft positioning sensor Quote Link to comment Share on other sites More sharing options...
Stevo Posted December 29, 2006 Report Share Posted December 29, 2006 Belt tensioner? Quote Link to comment Share on other sites More sharing options...
3WH12-96 Posted December 31, 2006 Report Share Posted December 31, 2006 is the ck engine light on or any codes stored?? and is it true that you actually took the plenum off?? if that is true sounds like you may have created a lean condition that the pcm is trying to compensate for. this engine and tranny combo in a 96 just never has problems.... sounds like you some air flow to the combustion chamber that the MAF is not recording Quote Link to comment Share on other sites More sharing options...
cah77388 Posted January 3, 2007 Author Report Share Posted January 3, 2007 Well actually I fixed that problem, I think what happened was I forgot to tighten one of the bolts holding onto the throttle body, which I don't know how I forgot, but I guess it created enough gap between the TB, and the plenum, and allowed air to flow between the two... Quote Link to comment Share on other sites More sharing options...
Cam'ron Posted January 3, 2007 Report Share Posted January 3, 2007 the odd time a rough idle like the can be attributed to a bad charging system as well, something not working as well as it should be... dirty contacts etc Quote Link to comment Share on other sites More sharing options...
GIANT MOTH Posted January 14, 2007 Report Share Posted January 14, 2007 Well actually I fixed that problem, I think what happened was I forgot to tighten one of the bolts holding onto the throttle body, which I don't know how I forgot, but I guess it created enough gap between the TB, and the plenum, and allowed air to flow between the two... Haha. I did that before and felt like an idiot after going through all the idle relearn crap. Quote Link to comment Share on other sites More sharing options...
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