My car idles at 1200 RPMs, is there something wrong?
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From: Shelby Twp. MI
Car: 91 Z28
Engine: Rebuilt and modified 350
Transmission: rebuilt T-5
My car idles at 1200 RPMs, is there something wrong?
When i start my car, the cars idle RPM on the tach reads about 1200 RPM, is this normal or is it too high? and if it is too high, what should i do?
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Joined: Nov 2002
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From: Castaic, CA
Car: 1988 Camaro RS
Engine: 2.8L of Raw POWER!!!
Transmission: Stick Shift
Axle/Gears: 3.42's
Either your IAC motor is lazy and doesn't like to lose all the way, your TB needs a good cleaning, or you throttle spring is weak. Try cleaning the Throttle body with some cleaner, it's easy, just follow the instructions. This inclused removing the IAC motor from the engine, holding it with the point down and sprying it to clean off the surface. If that doesn't help, Try shutting the throttle plate by hand, ush it shut and see if the idle goes down. If it does, your spring is weak. I fixed that problem on my car by going down to pep boys, buying a $6 carb throttle return spring setup, and mounting it on there. If there still isn't any sign of resolution, replace the IAC motor. it's not very expensive(compared to some other things), only like $20-$30, and the problem should go away. If none of this helps, let us know, we can come up woth other ideas.
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Joined: May 2002
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From: Santiago, CHILE
Car: 1986 Pontiac Firebird Trans Am
Engine: 305 Tuned Port Injection
Transmission: The famous 700R4
Axle/Gears: No idea
Clean/check the battery terminals. It could be ECM in "battery mode": "...when battery is bad, ECM put the idle at high RPMs for voltage compensation... (or so)" = Chilton's manual for others cars.
Denis V.
Denis V.
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Joined: May 2003
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From: Shelby Twp. MI
Car: 91 Z28
Engine: Rebuilt and modified 350
Transmission: rebuilt T-5
Originally posted by Project: 85 2.8 bird
does it stay there, or idle down after a while?
does it stay there, or idle down after a while?
It starts at 15, then it goes down to 12
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Joined: May 2003
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From: Shelby Twp. MI
Car: 91 Z28
Engine: Rebuilt and modified 350
Transmission: rebuilt T-5
Originally posted by 2_point8_boy
Either your IAC motor is lazy and doesn't like to lose all the way, your TB needs a good cleaning, or you throttle spring is weak. Try cleaning the Throttle body with some cleaner, it's easy, just follow the instructions. This inclused removing the IAC motor from the engine, holding it with the point down and sprying it to clean off the surface. If that doesn't help, Try shutting the throttle plate by hand, ush it shut and see if the idle goes down. If it does, your spring is weak. I fixed that problem on my car by going down to pep boys, buying a $6 carb throttle return spring setup, and mounting it on there. If there still isn't any sign of resolution, replace the IAC motor. it's not very expensive(compared to some other things), only like $20-$30, and the problem should go away. If none of this helps, let us know, we can come up woth other ideas.
Either your IAC motor is lazy and doesn't like to lose all the way, your TB needs a good cleaning, or you throttle spring is weak. Try cleaning the Throttle body with some cleaner, it's easy, just follow the instructions. This inclused removing the IAC motor from the engine, holding it with the point down and sprying it to clean off the surface. If that doesn't help, Try shutting the throttle plate by hand, ush it shut and see if the idle goes down. If it does, your spring is weak. I fixed that problem on my car by going down to pep boys, buying a $6 carb throttle return spring setup, and mounting it on there. If there still isn't any sign of resolution, replace the IAC motor. it's not very expensive(compared to some other things), only like $20-$30, and the problem should go away. If none of this helps, let us know, we can come up woth other ideas.
Yeah, i definelty need to clean my TB, so i'll try it and see if it works.
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Joined: May 2003
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From: Shelby Twp. MI
Car: 91 Z28
Engine: Rebuilt and modified 350
Transmission: rebuilt T-5
Originally posted by Denis.V
Clean/check the battery terminals. It could be ECM in "battery mode": "...when battery is bad, ECM put the idle at high RPMs for voltage compensation... (or so)" = Chilton's manual for others cars.
Denis V.
Clean/check the battery terminals. It could be ECM in "battery mode": "...when battery is bad, ECM put the idle at high RPMs for voltage compensation... (or so)" = Chilton's manual for others cars.
Denis V.
I JUST replaced the battery, but i'll check
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Originally posted by 92RS3.1L
I JUST replaced the battery, but i'll check
I JUST replaced the battery, but i'll check
RBob.
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From: Palm Bay, Florida, USA
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
Tap the gas pedal to spike the rpms up to about 1800 or so and release it real quick. Watch the tach. It should idle down, then sit at probably around 1000-1200 for a second, and then drop back down to normal. Tapping the gas like that takes the computer out of 'warm up mode' or whatever it's really called....and it brings the throttle back to minimum idle. NORMALLY, that is.
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