Ford F-250 Problem Report
Ford F-250 The tachometer sensor may fail
The tachometer sensor may fail; if the tachometer needle jumps around and the transmission has harsh shifts or does not upshift, this sensor should be checked. This sensor is mounted in a cover at the front of the motor.
This I think is also causing the engine to hover when at a constant speed. - Visitor
When at idle tach drops to zero then when accelerator is pressed it jumps to appropiate engine speed - Visitor
just started had to order part - Visitor
needle jumps below 1400 rpm and shifts incorrectly above this its ok. im going to try the sensor. - stevebporter
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it will go forward but won't back up?????