What would cause my 2004 Ford E350 5.4L 8cyl to have 2,000 rpm at idle and in neutral?
The van has 113,000 miles. Plugs changed at 100,000 miles. When started the rpms are at 2,000. Occasionally they will drop 100-200 rpm for 1-2 seconds then right back to 2,000 rpm. While driving there's no problem as long as the van is in drive. Once in a great while after driving around for a while it will be normal rpm when I put it in park. But usually works its way back to 2,000 rpm. Should I try to clean the throttle body or change the tps sensor? Any help will be much appreciated.
I would guess the TPS as I had this happen to our Ford and changing it fixed the problem, but do the tests to make sure, and maybe running a scan on the computer will also tell you.
Your intake manifold gasket has failed. Using a flashlight, look under it and you will see gasket material sticking out. Replace the intake gasket.
Not the TPS but you should remove the IAC and clean it. You may also want to look for a vacuum leak.
Deffinately clean the throttle body, ford has issues with that, also try unplugging the iac with key off, turn key on and plug back in, a quick relearn procedure
Vacuum leak
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