1991 Chevrolet Cavalier high idle

RRV1991

MEMBER
1991 CHEVROLET CAVALIER
2.2L
4 CYL
2WD
AUTOMATIC
62,236 MILES

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

5 Replies

HMAC300

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

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Tuesday, August 26th, 2014 AT 12:11 PM

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

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Tuesday, August 26th, 2014 AT 12:49 PM

HMAC300

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.

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Tuesday, August 26th, 2014 AT 1:07 PM

RRV1991