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Idle surges when heater turned on.
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pooldragon99
New User
Feb 24, 2011, 6:48 AM
Post #1 of 2
(3726 views)
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Idle surges when heater turned on.
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I have a 1990 Chevy Corsica Lt.When I start my car on a cold morning it will idle fine.As soon as I turn the heater on the idle will surge real high then drop way low sometimes stalling.What could be the problem???
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 24, 2011, 7:15 AM
Post #2 of 2
(3722 views)
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Re: Idle surges when heater turned on.
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You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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