car idles at 1250 rpm, bad IAC?
Thread Starter
Member
Joined: Oct 2000
Posts: 125
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From: St. Clair Shores, MI, USA
car idles at 1250 rpm, bad IAC?
My car idles at about 1500 to 1250 rpm when I have it in park. Do I need a new IAC valve? How do I test it to see if it is bad? I've heard of cleaning the inside of the throttle body where it goes into. Should I do that? Do I need to take the TB off if I do that? Will I need a new gasket if I take it off? Sorry I asked so many questions. Any help would be appreciated.
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88 iroc
LB9 305 tpi
k&N, flowmaster, ADS chip
160* thermostat
home made ram air
removed smog pump
TB bypass
ASCD big block hood
AIM - chris1roc
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88 iroc
LB9 305 tpi
k&N, flowmaster, ADS chip
160* thermostat
home made ram air
removed smog pump
TB bypass
ASCD big block hood
AIM - chris1roc
Supreme Member
Joined: Aug 1999
Posts: 2,441
Likes: 1
From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Do a TPS ad IAC adjustment as they are described in the tech article section, if that doesent help cleaning could be a good idea.
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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a AFR 195 headed 383 in the works!! ready May 2001...
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)
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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a AFR 195 headed 383 in the works!! ready May 2001...
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)
Member
Joined: Jul 2000
Posts: 402
Likes: 0
From: SoCal
My car wigs out once in a while. Somtimes it will idle high like yours for a few days. Sometimes it will idle low and want to stall.
The TPS and IAC adjustments are good advice but sometimes other things are the triggers. Like when you get low on engine oil and start to burn it or vaporize it and it gets into the intake via the PCV system.
James
The TPS and IAC adjustments are good advice but sometimes other things are the triggers. Like when you get low on engine oil and start to burn it or vaporize it and it gets into the intake via the PCV system.
James
Thread Starter
Member
Joined: Oct 2000
Posts: 125
Likes: 0
From: St. Clair Shores, MI, USA
thanks I'll try cleaning it this weekend.
------------------
88 iroc
LB9 305 tpi
k&N, flowmaster, ADS chip
160* thermostat
home made ram air
removed smog pump
TB bypass
ASCD big block hood
AIM - chris1roc
------------------
88 iroc
LB9 305 tpi
k&N, flowmaster, ADS chip
160* thermostat
home made ram air
removed smog pump
TB bypass
ASCD big block hood
AIM - chris1roc
Member
Joined: Dec 2000
Posts: 260
Likes: 0
From: Westbury NY
My '88 Iroc used to idle at 625-650. Now, when I let off the gas, it will either idle at 1100, or 750, but if I tap the gas quickly, it will drop down to 625. Would this be the IAC or whatever?
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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better
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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better
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