Question about 2004 Lincoln Navigator
My Navigator when at idle or low rpms first makes a low horn like noise from engine (almost seems like power draw) then it will want to stall out. Once I hear the horn like noise I can increase the RPMs to keep it from stalling. Then it will run fine. It happens when I come to stops or the engine is at low RPMs. Otherwise drives fine.
Idle Air Control (IAC) motor is sticking.You can try taking it off and cleaning it but most likely will have to replace it.
Posted on Feb 13, 2009
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Posted on Jan 02, 2017
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Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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