Sticky throttle

mercredi 26 novembre 2014

The throttle on my 4.0L 2003 TJ was sticking and not closing completely, resulting in an intermittent fast idle condition. There were no issues with the pedal or any of the external linkage but when I took the plastic inlet off the throttle body it became clear what was causing the problem.

There was a black varnish-like crud all over the interior of the throttle body, including the throttle plate, that was keeping the throttle from closing completely. A few minutes with some carb cleaner and a rag fixed it nicely. It now works 100%, just like new!



My question is - What caused that?

It's way upstream of the fuel injectors, so not likely to be gasoline varnish. It could be crud from the oil vapors fed into the incoming air from the PVC system but the engine doesn't burn oil so it seems I shouldn't be getting a lot of blow-by from the rings & valve seals?

Never seen that much crud upstream of the throttle plate (butterfly).

Anyone have similar experience?




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