Question about 1994 Chevrolet Cavalier

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Sudden Speed Decrease Stalls Car

My 94 Chevy Cavalier normaly runs great, leaks no fluids but will occationally stall when I come off the Highway and decrease speed quickly. It will shutter real bad and stall. I can sometimes drop the automatic transmission into neutral and as long as I don't have to stop at a sign or light I can roll through, place the care back in drive and continue without stalling. Yet I have to rev the engine a few times in neutral. Is this some kind of speed sensor problem? It happens more often if the AC in on. When I'm just driving in town the seems to run fine. I've been trying to diagnose this problem for over a year now and I want to fix it before this stalling places me in the middle of a busy intersection (in Danger). Can anyone help? Anyone have this same problem?

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Lock up solenoid sticking VERY common with the 125C

Posted on Apr 02, 2009

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If this is trying to die when you come to a stop after the transmission had heated up then I would say that you have a bad solenoid in the transmission that controls the lock up converter. It will feel like it is still in gear when you come to a stop. This is most likely to happen when come off freeways but not always will it do it. This can happen at lower speeds to after engine and trans have gotten hot.

The other possibility is that the exhaust is clogged, the converter may be clogged or muffler may have come a part on the inside and a piece of the baffle is turn across the outlet of the muffler. Building backpressure on the engine causing it to load up. This would most like happen after high-speed drive like on the freeway.

There one other possibility that I can think of GM turns the injector off on deceleration and it senses RPM speed to turn them back on. The crank sensor could be having a problem or the control module and it could still be a computer problem. You would need to have a scanner hooked up to see what was happening for sure by watching injector and RPM readings.

Without being able to road test the car myself this would be my best ideas on the matter, Unless you can given me a code if it has one, when this happens

Posted on Oct 29, 2008

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Sounds like a faulty TPS, or throttle position sensor. This is located on the throttle body itself. Sometimes they're just plain dirty, full of carbon, and need to be cleaned. Try cleaning it first, and while your at it, clean out the whoel throttle body, using a good name brand "carburetor cleaner". Carb cleaner not only cleans away carbon, but also leaves a dry film lubricant to keep things from sticking, which is especially helpful on throttle linkages and any moving parts within a carb or throttle body. Also a good idea is to go to radio shack, and buy electrical contact cleaner to clean off the MAF sensor, or Mass Air Flow sensor. A trip to the library should help you, find a haynes or chilton repair manual (unless you already have one)and it should show you where these components are located.

Posted on Oct 29, 2008

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