Question about 1992 Ford Explorer

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My 1992 ford exploer will not hold a steady idle. I replaced the throutle positioning sensor.when i start it, it revs to 2 rpms then cuts of and sometimes it runs but the rpms go up and down for about 1 to 2 mins then cutts off. the check engine light gos on and off

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  1. baring a major vaccumm leak
  2. idle speed control motor is probably sticking
  3. it is a 2 wire soleniod with an air shuttle which allows air to bypass the throttle plate.
  4. when acting up at idle tap the idle valve repeatedly with a small hammer.
  5. does idle change?
  6. if so replace valve

Posted on Aug 19, 2010

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Posted on Jan 02, 2017

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when this happens oes it start again then in a couple of minutes it dies again if so you either have a dead spot in your throttle position sensor which is worn section of contact inside the sensor from always being there in that position while driving or the idle air control vavle is no good and once the engine gets warm enough the valves internal contacts spread and break contact ex solder inside has corroded and a bad joint exist and when temperature increases metal expands and the electrical path can no longer arc because the gap is to big so it cuts out the best way to check is start the vehicle overnight cold if you can rev the engine multiple times then the throttle position sensor is good if not thats it try both in park and drive if you can constantly raise the rpms then your idle air contol is bad but the best way is to check the TPS with a meter across the contacts if voltage disappears then comes back the throttle position sensor is no good

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