Question about 1985 Ford F 250

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I have a 85 Ford F250 that has an idle issue. the

I have a 85 Ford F250 that has an idle issue. the mechanic states that is it searching for timing. The distributor has been replaced already along with the sure spark module. These are no vacuum leaks that we can find and the EGR has been torqued to proper specs as outlined in the manual I have..any ideas?

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  • yadayada
    yadayada May 11, 2010

    what engine is this? has the carbv been overhauled if it is a 460? does the EGR leak, see if it gets hot at idle, if it does it is leaking exhaust bas past the pentile valve and this causes the engijne to run rough, have repaired 100's of these for every reason you can think of over the past 35 years at amy Ford dealer, u are missing something real big.

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I'd check the throttle postion sensor, and check to see if the EGR is getting vacuum when the engine is idling. Also check the EGR valve positioning sensor. I don't believe motors are able to search for timing, it's controlled by where the distributor is located and by the control module and pick up coil. You could have timing variations, if the timing chain is streched.

Posted on Apr 28, 2010

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MY F250 IS ROUGHT AT COLD AND IT TAKES TO WARM UP. AND EVEN AFTER WARM UP IS ROUGHT BUT NOT AS MUCH. A MECHANIC CLEAN THE EGR AND IT IMPROVE BY 85 PERCENT BUT IS STILL ROUGHT


If you already check for vacuum leaks, change the plugs, fuel and air filters, the next step is to remove the plastic duct from the TB to expose and wipe clean the IAT sensor (screen covering TB entrance) applying Carb. Cleaner into a clean rag to wipe it clean. Do not apply Carb. Cleaner directly into TB or IAT Sensor. If problem persists, your IAC valve may be defective.

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