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1999 A8, kills randomly upon stopping

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1999 A8, kills randomly upon stopping

Old 11-06-2018, 12:40 PM
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Default 1999 A8, kills randomly upon stopping

Looking for help w/ a 99’ A8 4.2... Car will die randomly when coming to a stop at stop signs, otherwise runs fine. Doesn’t do it all the time. Car has done this for a long time & you can imagine the unsafe scenarios that are possible w/ this out on the open road. Looking for suggestions as we’re not sure what to do.
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Old 11-06-2018, 03:54 PM
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Does it stop dead? Or stumble and die out slowly? Does keeping some gas pedal on help?

Maybe a throttle adaptation would help. Or maybe the wiring to the crank sensor is fraying. How are the motor mounts?
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Old 11-06-2018, 05:35 PM
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Stumble & dies out *somewhat* slowly would be accurate. That’s what we do is keep our foot on the gas to keep it running when we feel it about to die. Not sure about motor mounts. Strange thing is how it does it sometimes & other times totally fine like it has a mind of it’s own.
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Old 11-07-2018, 03:43 AM
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I'd clean the MAF and throttle body, do a throttle adaptation. If that does not help there is a TPS which could be replaced.
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Old 11-07-2018, 07:12 PM
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A little more detail and history please. Do the dash lights die? Mileage on the car? Any codes? How long have you had the car? When was the fuel pump ever changed?
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Old 11-08-2018, 05:35 PM
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Dash lights kind of die off as it shuts down. not sure on codes, car has is around 177,000 miles, 2nd owner have had it probably close to 15 years has done it for a long time. Not sure on fuel pump but I believe that was suggested when I was looking into it quite awhile ago.
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Old 11-09-2018, 06:55 AM
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Default Stalling

Originally Posted by D2a8.4.2 View Post
Looking for help w/ a 99’ A8 4.2... Car will die randomly when coming to a stop at stop signs, otherwise runs fine. Doesn’t do it all the time. Car has done this for a long time & you can imagine the unsafe scenarios that are possible w/ this out on the open road. Looking for suggestions as we’re not sure what to do.
it could be a sticky ICV or sticky TCC solenoid valve. If you pop it into N before you stop and it doesn't do it the TCC valve.
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Old 12-06-2018, 10:25 PM
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Fuel filter, or passenger side fuel pump going bad?
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