Why does my 2001 f150 s rpms go up to 2000 when I put the truck in park or neutral,it drives great otherwise

Asked by May 31, 2015 at 07:07 PM about the 2001 Ford F-150 Lariat Extended Cab 4WD SB

Question type: Maintenance & Repair

2001 f-150 has started accelerating when it is put in park our nuetral but otherwise drives
just great

1 Answer

655

Hello, In order: Something binding throttle blades; ie carbon, cable out of adjustment, bent accelerator pedal bracket, etc. Major vacuum Leak; at intake, hoses, etc. IAC Motor stuck open with carbon buildup... This is the valve that controls the idle speed by the ECM, located at the rear of throttle body. Good Luck, AskTrannyMan

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