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1990 pontiac sunbird over revs
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91chevcavowner
New User
Mar 16, 2010, 11:44 PM
Post #1 of 2
(1281 views)
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1990 pontiac sunbird over revs
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1990 pontiac sunbird
2.0L 4cyl
246 000km
when my car starts it starts perfect and runs well for 15 seconds and then starts over revving. i though it might be the throttle cable so i replaced it but the problem was still there. any suggestions?????
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steve01832
Veteran
Mar 17, 2010, 3:10 AM
Post #2 of 2
(1279 views)
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Re: 1990 pontiac sunbird over revs
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You can try disconnecting the idle air control motor and then starting the car. If the idle is low, you need to check the IAC signal with a plug in test light. If that all checks out ok, replace the idle air control motor.
Other items that can cause this could be faulty head/gasket, intake manifold leak, vacuum leak, faulty MAP sensor, faulty TP sensor, or a faulty coolant temp. sensor.
Steve
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