91 montero low idle

Mar 10, 2007 2 Replies

when cold and in park it idles at 12-15 hundred RPM and about 800 in drive, when it warms up it idles at about 1000 rpm in park and about



500rpm in drive, i have cleaned the throttle body... what else should i try? i just bought it and i love the space and the transmission is fine, no slipping.. other than the low idle the engine runs like a dream, no leaks or smoke.

the truck is a 91 montero RS with a 3.0 and a 4 speed auto.



thanks for any and all help.. and the email addy in the header works



Defective coolant temperature sensor or possibly a vacuum leak somewhere?

There is also an Idle Air Control (IAC) on the throttle body. Checking the IAC would be high on my list of things to check.

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