Question about 1987 Chevrolet Cavalier 4 Door
Motor Revs really high when car is initially started, and then simmers over about 10-15 seconds. Idles pretty decently. When switching to Neutral after the idle calms, It does the same. While in Drive It accelerates some-what rapidly until about 25 Miles per hour, then slowly climbs higher. I didn't allow it to get past 35, i assume it would continue. When Switched back to park, it repeats itself. Reverse is relatively the same as drive. What are some things that would cause this?
It sounds a lot like you have a vacuum leak, I'm assuming your car if fuel injected. If there is too much air getting into the engine from a broken vacuum line of possibly a stuck Idle air control motor the computer has to keep adding fuel to make sure the fuel to air mixture is right. the end result of this is the engine RPM's keep going up untill it reaches the propper mixture.
If you are under the hood with the engine running you may hear a "HISSING" noise. It may be loud, it may be subtle, so you might need to listen fairly close.
The job of the idle air contol motor is to bring the idle of the engine down to the proper Idle rpm in a controlled manner without the engine stalling from a sudden loss of fuel from letting your foot off the pedal, after a while these start to get sticky or weak & don't work propperly so this may be the cause as well.
If you don't hear any hissing & can't find a vacuum leak, you'll need to suspect the Idle air control motor.
Good Luck I hope this helps
Posted on Mar 20, 2009
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Posted on Jan 02, 2017
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