Question about 2002 Ford F150 Regular Cab

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Engine surge during warm up.

On initial start up during warm up cycle, The engine will surge from 500-1200 in park and driving. No codes or check engine lights, After warm up no issues. Replaced air idle, throttle position, mass airflow sensors. slowed serge to 200-300 rpm. Did not find any vacum leaks. Throttle position and air idle sensors had carbon deposites.

Posted by lawrence_fry on

  • lawrence_fry Sep 27, 2009

    5.4L gas

  • Anonymous May 11, 2010

    What engine do you have?

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Try changing your PCV valve make sure the hose is clean and not full of oil. Also check the elbow end that goes to the intake they tend to collapse from oil saturation. Hope this helps.

Posted on Sep 29, 2009

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