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Topic
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2001 Lincoln Continental, 4.6L V8, 109,000 miles.
Hello everyone,
Over the past few years my car has stalled very sporadically when coming to a stop or while making a very sharp turn at low speeds. What happens is the engine drops to about 500rpm or lower and the car stalls but will start up right after. This issue is very sporadic and tends to only happen when it’s cold outside, usually below 40F. More recently the car has been having the above issue even more and now when switching from park to either the reverse gear or drive gear, the engine rpm will drop significantly and will almost stall (see my linked video of the rpm dropping). I have a suspicion that it’s a vacuum leak, oh, and I also do not have any codes being thrown either. I’ve changed the TPS sensor, IAC sensor, PCV valve, cleaned the MFS, cleaned the throttle plates, also also replaced the alternator that was failing.
If anyone has any insight to this issue I would greatly appreciate it.
Thanks,
Keenan
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Replies
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I see said you changed it, but the symptoms are still consistent with an IAC valve. Did you replace it with a new IAC?
Vacuum leaks tend to cause higher idle. But if it’s something you still want to investigate, you could look at your fuel trims on idle. If they’re adding a lot of fuel, rev and hold the engine up to 1500-2000 rpm and look for the fuel trims to move closer to a zero percentage correction. You can try spraying soapy water at any suspect vacuum point and listen for idle to change or likewise observe fuel trims to move too.
If you leave the shifter alone for a minute and let the car warm up, where does idle actually sit at in park?
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