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lordarmy01
New User
Jul 10, 2009, 4:13 AM
Post #1 of 2
(2414 views)
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Rebuilt 1998 Pontiac Grand Am GT 3.1L from heads up. Idle in Park/Nuetral is too high (2500/3000rpm), but in gear, roughly between 700/1100rpms. What happened or what petered out?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 10, 2009, 4:17 AM
Post #2 of 2
(2410 views)
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First go back and check all your wiring and make sure all the grounds got hooked back up. Check for any type of air leaks anywhere around the intake or throttle body.
After those things are eliminated, you may have a bad IAC ( idle air control) but try 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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