1990 Camry Too Fast Idle

[1122union]

My 1990 4 cyl. (automatic) Camry's idle started running too fast all of a sudden. It almost seems like I have a vacuum leak, but the car runs fine with no misses etc. I sprayed starting fluid around the hoses looking for a leakwith no success. My Haynes tells how to adjust the idle on cars up to 1987 (after that nothing).

What should I look for?

Thanks,

RK

[Doctor J]

Check idle speed control valve, if it does not help, find out that there is the power steering pump air control valve is not stuck open.

[JetspeedCamry]

There is an adjustment screw ontop of the throttle body.

[fredk]

i bet its just full of dirt

[1122union]

I cleaned the throttle body and screwed in the adjustment screw. The idle slowed down but I still think I have a vac leak somewhere and the screw is just compensating for the leak. If the engine noise iwasn't so high I probably could hear it. Maybe I can find a vacuum system diagram somewhere.

Thanks again,

RK

[IvanHoe]

Spray starter fluid on the vacuum hoses. If there is a leak, the idle will get really high for the moment the spray is applied to the area.

.....old school trick

[toyomoho]

Or try using a small propane torch, valve on but no flame. The propane will also get into any vacuum leak and effect the idle.