Why truck slows down and speeds up?

Asked by Jan 14, 2016 at 11:50 PM about the 1995 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

Engine light comes on and truck slows down and makes popping sounds and then speeds up on its own.

3 Answers

95,145

Coups be an ignition problem, pull the codes, the check engine light came on so it should have stored a code.

The code that came up was speed sensor and I had that replaced this week. But that did not solve the problem.

95,145

Did the speed sensor test bad or was it just replaced cause of the code? There could be a number of things causing this, spark, fuel delivery, sensor misreads, grounds, wiring connections, etc. Were all of the test done when the speed sensor code was found or just the KOEO test?

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