Question about 1999 Lincoln Navigator
Your are half way there. My first guess is faulty throttle position sensor TPS. If this not telling the PCM that the throttle has closed when you take your foot off the gas it cannot in turn call on the idle air control valve to set the idle correctly. First I would make sure everything is spotless. Remove the air trunking to the throttle body and with plenty of kitchen paper towels and WD40 open the throttle plate and give the whole interior of the throttle body a thorough clean. Clean the Idle air control valve and associated passages too. So far this will cost you some time. The TPS is basically a rheostat like the volume control on a radio. There is a carbon track with 0 to 5 volts along its length and the contact position corresponds to the throttle shaft rotation. Before just buying a new one I would investigate if it can be repaired. First plug and unplug the electrical connector a few times to freshen the contact. Clean the carbon track with electrical (no residue) spray. Move the mount position of the middle contact along the throttle shaft a fraction; this will cause the contact to run on a less worn arc of the carbon track.
Posted on Aug 29, 2010
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Posted on Jan 02, 2017
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Aug 07, 2014 | 1999 Lincoln Continental
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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