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Anyone had issues with a 2004 Navigator randomly cutting out for less than a second? It happens about one to two times for every hour worth of drive time and has completely killed the engine once where we had to pull over and restart it with no issue. No engine codes exist either.
I had the same issue on a completely different make and model and the problem turned out to be a failing crankshaft position sensor. Like I said, different make, but I'm throwing it out there anyway.
That is something! I have tried everything under the sun to recreate it on my terms but can't. I am an aircraft mechanic and my brother is a GM mechanic, both seasoned in our areas of expertise, but at a loss. I am about ready to start shotgun maintenance by just throwing parts at it. Just haven't figured out what just yet. I'll run down this lead! Thanks!!!
Something I have noticed is there is a quiet hollow popping noise from the rear of the car before it cuts out. Sometimes the popping happens without it cutting out but it will pop before cutting out.
Could be. From the back of the car as if under the 3rd row seating. I've had it suggested to me it is unburnt fuel in the exhaust.
I have now changed the crankshaft position sensor with no results. Using a Snap-On Solus it did eventually throw a code for mis-fire on cylinder #2 but just one time. I changed the coil pack but with no results. I have learned how to repeat it. I can drive it at 40mph and accelerate at a decent rate (not floored) to 65mph and drive it for 30-60 seconds, let it coast to down to 40 again, and on acceleration it will miss repetitively before I get all the way to 65. Every time I go through that pattern it will always miss towards the beginning of the acceleration.
I have had it suggested the O2 sensors could be bad.... any thought?
Just a crazy idea but maybe you have a vacuum line or fitting that is constricting upon acceleration.
I had a similar issue to yours a few years ago. For a few years, the engine would cut out for a split second on the highway if I goosed the gas pedal to pass a car or whatever. It would just die, which would cause me to let off the gas pedal, and then I'd gently press the pedal and everything was fine. This would happen very rarely and never caused a code, so I lived with it.
Then I got a code, a lean code. I posted a thread about it recently. It was a vacuum leak. But I suspect the two issues were related.
Take a look at the pic below and notice the crease in the rubber elbow near the split. That crease developed over time *before* the split occurred and was the *cause* of the eventual tear in the rubber causing a vacuum leak and a lean code.
So that crease was the result, I believe, of the soft oily degraded rubber being weak and *constricting* closed from time to time and thus causing my momentary hesitation.
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