Paul_NO

My wife's '90 Ranger (2.9 V6 EFI) is barely ldling at +/- 400rpm. It has been steadily decreasing over the last year or so. It quit having a fast idle when starting cold. All I could find is that the Throttle Position Sensor may be bad. Has anyone run into this or had the TPS go bad?

 

RPSH8R

its most likely the TPS or IAC, although i dono how to test them.

Paul_NO

IAC? Is that the air bypass valve?

RPSH8R

Its the idle air control valve, looks like a film canister on the pass side of the upper intake

Paul_NO

thanks, that is called the Air Bypass Valve on my Bronco, IAC on the Ranger. I'll check it out.