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Could be throttle plate stuck open - try to free it with a screwdrive or similar down in the throat Additional Answer:If you have the V6 model (perhaps the V8 as well) check your Idle Air Control Valve. It is mounted directly on top of the air intake, right above the throttle plate and uses an electronically controlled valve to bypass the throttle plate. It is common for these to tear internally, allowing the engine to draw as much air as it likes, thus idling very high (2000 RPM+). You can test this by removing it and inspecting the insides and seal. Sometimes you are able to directly see the torn rubber/plastic diaphragm within the valve. This valve or a stuck throttle plate are the only normal causes of high idle on this Year and engine. Two other notes: most replacement Idle Air Valves are mounted 180 degrees rotated from factory orientation (so they fail to stall rather then 2000+ RPM). If you remove the rubber hose connecting the air box to the air intake, you will not be able to start it and inspect the intake because the MAF sensor is in the air box and the car will not run without it.
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Whats causing your 1992 ford ranger to idle to fast?
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need to replace the fast idle valve. they are only located a the dealership.... good luck need to replace the fast idle valve. they are only located a the dealership.... good luck
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