intermittent cut off
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Well, this is interesting and sounds very familiar.
https://www.6speedonline.com/forums/...-scared-4.html
A fuel tank check valve is the alleged culprit, but I am left to ponder whether my regular driving is considered spirited driving by others...
https://www.6speedonline.com/forums/...-scared-4.html
A fuel tank check valve is the alleged culprit, but I am left to ponder whether my regular driving is considered spirited driving by others...
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Your symptoms sound a bit different, but any chance it could be this?
https://www.6speedonline.com/forums/...ht=coast+reset
https://www.6speedonline.com/forums/...ht=coast+reset
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From: Ottawa, Ontario, Canada
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The misfire reset is a possibility, I will have to try that next time it happen. I believe that with a good OBD II you can see if the Misfire Reset has been done or not so I will check with my Foxwell NT710 to see before doing any reset. If I find something I will post it
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It is a 2006, and it is a manual. 34,950 odd miles on the odometer.
I am still drawn to the key portion of the ignition. The button for start works every time...usually. Maybe it is the interaction every time one starts and shuts off the car, and every so often I will turn the key to start, and have to re-do the sequence. This is not a regular occurrence, but it seems like if that happens, then shut down could also happen, and it would appear to be a 'normal' power down for the car's systems. I think the start button portion is fine, its never not started, but the ignition cylinder portion I have seen fail on several other vehicles and it is an item subject to wear.
I am still drawn to the key portion of the ignition. The button for start works every time...usually. Maybe it is the interaction every time one starts and shuts off the car, and every so often I will turn the key to start, and have to re-do the sequence. This is not a regular occurrence, but it seems like if that happens, then shut down could also happen, and it would appear to be a 'normal' power down for the car's systems. I think the start button portion is fine, its never not started, but the ignition cylinder portion I have seen fail on several other vehicles and it is an item subject to wear.
Last edited by Marmot; Apr 1, 2026 at 05:55 AM.
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So, going through my mental check list of 'stuff that triggers codes/errors vs stuff that doesn't' and balancing 'required for the engine to be on vs off' I think that:
It must not be:
coils, plugs, the fuel pump, or air related (emissions), or battery related. These should all trigger codes.
It could be:
a sensor related to speed (since this has always happened at idle, stopped), a clutch reading (based on prior posts), a fuel pressure issue mimicking a fuel cut off triggered by the ignition or power to the fuel pump/system. A filter issue, though I have yet to find a location or part number or even part for a fuel filter on the 2006 4.3. Or something environmental like vapor lock, but I eliminated this because of the immediate restart of the engine without any hesitation.
I am still leaning toward an ignition switch type failure that the car 'thinks' is an intentional shut off, a loose wire or ground? or a fuel supply issue resulting in the same outcome.
Or software. It could always be software.
It must not be:
coils, plugs, the fuel pump, or air related (emissions), or battery related. These should all trigger codes.
It could be:
a sensor related to speed (since this has always happened at idle, stopped), a clutch reading (based on prior posts), a fuel pressure issue mimicking a fuel cut off triggered by the ignition or power to the fuel pump/system. A filter issue, though I have yet to find a location or part number or even part for a fuel filter on the 2006 4.3. Or something environmental like vapor lock, but I eliminated this because of the immediate restart of the engine without any hesitation.
I am still leaning toward an ignition switch type failure that the car 'thinks' is an intentional shut off, a loose wire or ground? or a fuel supply issue resulting in the same outcome.
Or software. It could always be software.
mine is a 2007 / manual/ 24k miles
Edwin
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Yours sounds much more similar to the older thread I posted, which the OP states very deep into the post, that the dealer determined a throttle sensor position variation from what the computer was reading, leading to stalls while under power. That is the same thread that went down the rabbit hole of the fuel tank check valve. It is certainly unnerving as an experience.
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The misfire reset is a possibility, I will have to try that next time it happen. I believe that with a good OBD II you can see if the Misfire Reset has been done or not so I will check with my Foxwell NT710 to see before doing any reset. If I find something I will post it
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Fuel Tank parts for Aston Martin DB9 (2004-2012)
#31 inside the fuel tank is a common issue for the exact same symptoms and conditions you are describing. I'd put money on this being your issue.
#31 inside the fuel tank is a common issue for the exact same symptoms and conditions you are describing. I'd put money on this being your issue.
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From: San Diego, CA
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It's a really straight-forward repair. I usually just cut the end of the hose and reattach it. As someone mentioned, best to do when you have little fuel in the tank. I'm going to eventually replace the hose with a braided line or something, but for now I'm lazy.
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