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post #1 of 2 Old Jun 11th, 2019, 03:40 PM Thread Starter
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engine shutdown mystery

97 maxima, 134,000 miles. (I have invested over $1600.00 in this problem so far, even many days in the hands of a reputable mechanic): When driving or even idling in park, once engine heats up (15 mins driving, 25 mins. parked) the engine will stop. It will restart immediately. No engine codes. I have replaced the computer, fuel pump, fuel filter, fuel press regulator, most of the engine sensors (even though no codes), even completely drained and refilled fuel tank. The car runs smooth and strong, then stops. I have noticed it occasionally struggle when decelerating trying to keep idle speed-(drops too low-I have to "catch it" with accelerator) When this shutdown occurs when parked there is no swing in idle speed-just an abrupt shutdown. After all of this both the mechanic and I are left scratching our heads. After all of this money, I am hesitant to put another dime into it. I have not replaced coil packs or plugs (another $130.00 plus shipping) even though mechanic indicated he doubted trouble here. Any direction here would be appreciated.

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post #2 of 2 Old Jun 12th, 2019, 12:36 AM
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If you can duplicate it on a consistent basis, I would install a fuel pressure test gauge and run the engine until it stalls, to see if the fuel pressure could be the issue. If it stalls and the fuel pressure is still at 34-36 psi, you can fuel out a fuel pump issue. I've also installed timing lights and run the vehicle to see if the spark cuts out (put the clamp around the harness of one of the front coil packs (you'll need to remove the cover over the coils). Cam position sensors and crank position sensors can cause stalling or misfiring, especially when they get hot, but not always trigger a code. I'm assuming you already replaced them since you mentioned replacing "sensors." A sticking EGR valve could also cause stalling. Another problem that sometimes occurs is breaks in the engine harness where it creates a bend between the engine and the firewall. With the engine running, grab the harness and move it around and see if you can cause the engine to cut out. If so, there may be a broken wire making an intermittent contact inside the harness. That said, those issues usually trigger a trouble code. As with anything, I prefer to confirm a part is actually bad rather than just swap parts out until something fixes it.
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