If you experience cold starting problems, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steadily and run when the accelerator pedal is not pressed.
Problems for specific Ford Ranger years:
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Most reported 1994 Ford Ranger problems
it seems to bog down when u press on the accelerator if u go slow i mean real slow it does ok also seems to bog down when it reaches 3k rpm like its starving for fuel or getting too much
If a noise from the rear end is heard when going around turns or after driving at highway speed for an extended period, this could be caused by a failing deferential clutch kit. An updated differential clutch kit available.
Ranger 3.0L and 4.0L
The temperature gauge on the instrument panel may fluctuate and give incorrect readings. If this happens, a new gauge and sender kit should be installed. The sending unit "sends" the information to the gauge.