cah77388 Posted December 28, 2006 Report 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
IRONDOG442 Posted December 28, 2006 Report Posted December 28, 2006 year make model engine ? sounds to me like a TPS or CKP Quote
cah77388 Posted December 28, 2006 Author Report Posted December 28, 2006 sorry, its a 96 Cutlass with the 3.1 Quote
IRONDOG442 Posted December 28, 2006 Report 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
chadz34 Posted December 28, 2006 Report Posted December 28, 2006 year make model engine ? sounds to me like a TPS or CKP What's CKP? Quote
digitaloutsider Posted December 28, 2006 Report Posted December 28, 2006 It means crankshaft position, but I'm guessing he means crankshaft position sensor. Quote
IRONDOG442 Posted December 29, 2006 Report Posted December 29, 2006 yeah all my service manuals call crankshaft positioning sensors ckp because cps is cam shaft positioning sensor Quote
3WH12-96 Posted December 31, 2006 Report 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
cah77388 Posted January 3, 2007 Author Report 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
Cam'ron Posted January 3, 2007 Report 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
GIANT MOTH Posted January 14, 2007 Report 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
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