2004 GX Prado Erratic Idle Problem

Submitted: Tuesday, Sep 11, 2012 at 17:17
ThreadID: 97965 Views:10114 Replies:6 FollowUps:9
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About 12 months ago I had the heads rebuilt on my '04 GX 4.0 V6 Petrol Prado (thanks to an inattentive apprentice leaving the radiator cap loose) and ever since the engine idles at 1200-1500rpm in the peak hour crawl. As soon as the car stops moving, idle returns to 800-900rpm. Costing about $300/qtr in poor fuel consumption.

The mechanic that did the head repair has checked MAF, Throttle body, EFI fault codes = nothing.

Took it back to Toyota. Same thing. Diagnostics (computer) shows no fault codes, but they can see the idle issue when the car is moving and it disappears when movement stops. Clueless.

Some threads talk about O2 sensors, others about coolant sensors, others about vacuum hoses. The sensors are expensive "trial & error" solutions. Anyone seen the same issue and found a resolution?

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