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Cause of LOW idle?

2482 Views 7 Replies 2 Participants Last post by  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?
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That vehicle and the Bronco II with that engine were known for fuel rail contamination after many years of use. The fuel injectors plug into the fuel rail and we've found many rails rotting on the insides. The rust flakes off and plugs or partially plugs off the injector. We usually replaced the fuel rail and injectores to fix the problem, but you may be able to get away with just the rail itself. Good Luck!
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