Posted by jimg.allentown on January 10, 2016 at 15:49:54 from (173.49.143.208):
In Reply to: ot/ford bronco posted by mnoliverguy on January 10, 2016 at 14:17:54:
Right off the top of my head, I would also suspect the idle speed control - best way to check it is when the engine is running, unplug it and see what the engine does. If it makes no change, you MAY have found the problem. If it changes the RPM, it is working OK. In the past, I have seen the PCM fail in that circuit on a Ford product. That does remain a possib8ility, although a rare one. Other things I have found are wiring harness rubbed through exposing (and grounding) wiring and the little bit that the engine moves when you put it into reverse could ground an exposed wire. Also, a throttle body that was cleaned will cause problems. Starting around 1992, Ford came out with a throttle body that is not supposed to be cleaned - ever. It was re-engineered to replace the slight throttle opening for the hard stop with a calibrated hole in the throttle plate. This made it immune to the usual sludge buildup that was common on older fuel injection setups.
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