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1993 Pickup Idle

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My daughter has a 1993 Toyota Pickup that recently started having an idle problem. It has 180,000 miles and previously had no issues. When you start it up, the engine idles high (1,200 rpm). Once warm it will pulse from 1,000 to about 400 rpm, is there something to check first? Thanks.

Edited by tursup

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For this vintage of truck - there are three possible places I'd check first. One is the idle adjustment screw - should be located very close to the throttle cam - they have a tendency to back out over time and mess with the idle. Other is close to the back of the engine - the EGR's plumbing, there is a place where a bunch of vacuum hoses plug into a valve - sometimes one of those vacuum hoses will be damaged, missing, or just got disconnected. Might just need a good throttle body cleaning - even a fairly small amount of varnish and gunk can cause idle issues.


Other than that - could be any number of things. Bad tank of gas, fuel line leaks, vacuum leak, exhaust leak, etc. But the above are pretty common the Toyota trucks.

Edited by fishexpo101

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