Suchproblems may be caused by a bad vehicle speed sensor, MAP sensor, engine computer or TCC solenoid. RPM REVERBERATIONS A vibration that comes and goes with changing engine speed can be due to a broken or collapsed motor mount, loose or broken engine accessories, or sometimes by loose or worn drive belts. Vibrations can be transmitted to the
Takethe idle control valve out and flip it over to expose the valve openings. Take your voltmeter and set it to "Ohms.". One voltmeter lead should touch one end of the valve terminal, and the other lead should do the same for the other end. A reading between 0.00 and 0.05 means the valve is functional.
Youmay notice poor engine performance, including irregular acceleration, misfiring, hard starting, or surging. On some car models, a failed CMP sensor will prevent the ignition from making a spark, so the engine won't start at all. A failing camshaft position sensor (CMP sensor) can produce a confusing range of problems. Sten Rademaker/Unsplash.
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symptoms of a bad vehicle speed sensor