I have a 89 gts. For some reason now that when I start the car it revs up to 2k rpms. As I drive and it warms up it used to go down but now it stays at 1700 when stopped and clutch is pushed in, but now when it warms up as I am rolling with the clutch pushed in it will rev to 1300 then drop to 900 then rev to 1300 drop to 900, and over and over again till I stop then it just revs to 1700 again. Any Idea?
Check the idle air control valve attached to the throttle body.
It is supposed to open when the engine (coolant) is cold, and close off as it warms up.
If it gets filled with grease and grime it will hang up.
Follow the two coolant hoses that go to the throttle body and there it is.
There are two air hoses that go to it also, those could be a problem too. One should go to a valve on the steering rack, and the little tit on that valve can break off and give you a vacuum leak.
__________________
'88 Corolla, AE92 SR-5, 7A-FE swap/GT-S suspension
'87 Corolla, AE82 FX-16, 4A-GZE swap (autocrosser)
'03 Tundra 4X4 Access Cab, (FX tow vehicle/Home Depot runner)
Modification: Changing something to what you thought it should have been from the start!
The Following User Says Thank You to Donald For This Useful Post:
Check the idle air control valve attached to the throttle body.
It is supposed to open when the engine (coolant) is cold, and close off as it warms up.
If it gets filled with grease and grime it will hang up.
Follow the two coolant hoses that go to the throttle body and there it is.
There are two air hoses that go to it also, those could be a problem too. One should go to a valve on the steering rack, and the little tit on that valve can break off and give you a vacuum leak.
Now it is idling around 2500 when cold then when it warms a bit it revs up then drops then revs up then drops. I am about to drive it off a cliff. I checked and can not find a vacuum leak. I am at a loss
Hi, this is Joe from www.MagAuto.com, OEM Toyota parts at wholesale prices. I read the thread on this post entirely; it sounds like an IAC motor, like Donald said. If not, give your throttle body a look over, maybe a good cleaning.
Give it a good cleaning. A quality induction system cleaner will include an aerosol can that (after removing the intake tube from the throttle body) you should spray onto the throttle body butterfly. If that solves your problem, sweet, it was a cheap fix. If it comes back within the next few days, I would assume it's your IAC motor.
How is your throttle response when driving? Do your revs fluctuate all over the place when you're cruising (staying within what SHOULD be a relatively constant rpm range)? If so, sounds like it might be a throttle body. Does it run rough in addition to your RPMs jumping when it's in park/neutral? That might indicate injectors being clogged. If that's the case, that induction cleaner I mentioned can help. Get yourself a kit that includes the aerosol throttle body cleaner AND a fuel additive to clean your injectors.
Hope this helps. Visit www.MagAuto.com to get good deals on any parts you need for your repair.
Give it a good cleaning. A quality induction system cleaner will include an aerosol can that (after removing the intake tube from the throttle body) you should spray onto the throttle body butterfly. If that solves your problem, sweet, it was a cheap fix. If it comes back within the next few days, I would assume it's your IAC motor.
How is your throttle response when driving? Do your revs fluctuate all over the place when you're cruising (staying within what SHOULD be a relatively constant rpm range)? If so, sounds like it might be a throttle body. Does it run rough in addition to your RPMs jumping when it's in park/neutral? That might indicate injectors being clogged. If that's the case, that induction cleaner I mentioned can help. Get yourself a kit that includes the aerosol throttle body cleaner AND a fuel additive to clean your injectors.
Hope this helps. Visit www.MagAuto.com to get good deals on any parts you need for your repair.
no, it has good throttle response, and not very rough at all so I am not to sure
Before you replace it try cleaning it. Take the rubber air intake off throttle body and look for the large square hole on inside bottom of throttle body. This is the port you want to give a large spray of throttle body cleaner.. Can try spraying and letting it sit to soak in. When you go to restart will probably have to hold gas pedal slightly to clear it out. Also if your car is running cold (due to a bad thermostat) it will cause the valve to not operate correctly as it has a passage where coolant passes through it to deactivate it when engine is warmed up. This is assuming you have the 4AFE.
I think I should have 2. One off my '89 GTS and one off the '87 FX-16 that I am doing an engine swap on.
I'll have to check tomorrow to see if they look any good. I'll let you know what I find.
__________________
'88 Corolla, AE92 SR-5, 7A-FE swap/GT-S suspension
'87 Corolla, AE82 FX-16, 4A-GZE swap (autocrosser)
'03 Tundra 4X4 Access Cab, (FX tow vehicle/Home Depot runner)
Modification: Changing something to what you thought it should have been from the start!
I think I should have 2. One off my '89 GTS and one off the '87 FX-16 that I am doing an engine swap on.
I'll have to check tomorrow to see if they look any good. I'll let you know what I find.
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