Question about 2002 Ford F150 Regular Cab
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.
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
Tips for a great answer:
??There are two types of DTC's, 1 trip DTC's and 2
??A 1 trip DTC is for a condition that requires
immediate attention such as a catalyst damaging
??A 2 Trip DTC is one that a condition must be found
during 2 consecutive trips such as an EGR fault.
??Most Monitors do not set a DTC and light the MIL
when a vehicle fails a test for the first time during a
DRIVE CYCLE. If a test is failed on a second
consecutive DRIVE CYCLE the MIL will light and a
DTC is stored in the vehicles powertrain control
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