Question about 1985 Ford LTD

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I have a 1986 ford crown vic that has i fluctuating idling the battery is bad but i dnt know if that would cause it would that be the problem or should i replace the tps censer also?

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The battery may be the cause but, it could be lots of things. if the battery is bad then just replace it no matter what your symptons are. if you want to test your tp sensor then get a voltmeter and probe the wires at the sensor. there are 3 wires: one is a ground, one is a 5 volt supply, and the third is the return signal to the pcm. turn key on (engine off) test the ground, and check the 5 volt supply wire for voltage (approx 5 volts), then check the third wire with throttle closed it should read about 1.0 - 1.5 volts, then open throttle all the way and voltage should rise to 4.5 - 5.0 volts. if these check out then your tp sensor is good.

Posted on Sep 12, 2008

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