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Posted on Jan 02, 2017
SOURCE: rough idle stalls at low rpm's
hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck
Posted on Sep 18, 2008
I had the same problem with my 1989 Chevy Cavalier Z24 with the Automatic transmission. There is an electric lock up clutch within the torque converter that engages at roughly 35mph. It's designed to give the car better highway mileage. If that circuit fails, the clutch will remain in the "locked" position when hot, and stalls the car unless neutral is engaged and the car comes to a complete stop. I remember the car making all sorts of odd noise with this malfunction. I took mine to the dealership and they had it repaired in an hour.
My daughter had a similar problem with her 1988 Cavalier Z24 with the manual 4-speed transmission. There is a speed sensor on the top of the transmission that I replaced which solved the problem for her.
Posted on Jan 10, 2009
I had a similar problem. I found the filter cartridge below the pcv valve had carboned up, and after the crank case pressurized, oil was forced out the pcv supply line to the throttle body. The idle air control valve solenoid got oil in it and caused my problem, but only when it was cold. The pcv cartridge is accessed by removing the pcv valve and the rubber fitting that the pcv valve mounts in. It can then be fished out with a pick set, and it is a pain because you can't see it, but you can get you hand back there. I hope this helps you.
Posted on Feb 28, 2009
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