Question about 1985 Ford F 250
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?
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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Posted on Jan 02, 2017
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The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Do not attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
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