1991 Chevrolet Cavalier high idle

1991 CHEVROLET CAVALIER
62,236 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
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RRV1991
  • MEMBER
  • 3 POSTS
its not everytime but randomly and now more frequently ill start my car and the engine idles really high i can put it into gear and turn it on and off and its still really high, but once the car warms up it will run fine i can turn it on and off no problems and the idle will return to normal levels. what should i start out replacing
Aug 26, 2014 at 3:33 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
clean throttle plate on both sides and iac hole with choke cleaner then check for a vacuum leak like a small hose off /cracked or broken
Aug 26, 2014 at 5:11 AM
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RRV1991
  • MEMBER
  • 3 POSTS
ive cleaned it with spray cleaner and it made it more frequent then I used the fuel injector cleaner mixed into my gas tank then I didn't have a problem for two days then yesterday it acted up again. I was wondering if it could be a mass air flow sensor? there is no holes in the hoses
Aug 26, 2014 at 5:49 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
kinda sounds like a vacuum leak to mebecause when it goes to closed loop it doesn't do it. spray around tbi unit as I think that is what you have and see if idle changes if it does then the gasket is blown otherwise you'll have to scan for codes and check hose leading to map sensor I forget on those it's been so damn long if you even have one if it 's soft andsucking together ifit is replace it.
Aug 26, 2014 at 6:07 AM
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RRV1991
  • MEMBER
  • 3 POSTS
what would be the sign that i need to change the map sensor? and i do have a throttle body injectors.
Aug 26, 2014 at 6:30 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
scan for codes first..... it may not be a map sensor.
Aug 26, 2014 at 6:35 AM
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