I have a 2002 F-150, 4.2 V6. It has erratic idle when stopping at lights and stop signs. I have replaced )2 sensors, IAC, TPS, plugs and wires and cannot rectify the problem.

Asked by Nov 16, 2015 at 09:28 PM about the 2002 Ford F-150

Question type: Maintenance & Repair

replaced IAC, TPS, plugs/ wires and coil pack. Truck still suffers from erratic
idle. Also replaced all 4 02 sensors.

2 Answers

61,215

Sound like you need to check all your vacume hose,s and your intake gasket for leaks,

20,975

Especially the PCV valve and elbow, the elbow connecting the PCV valve the the underside of the throttle body often become badly deteriorated and cause a vacuum leak with symptoms like yours.

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