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B5 A4 2.8Q stalls at idle and won't restart until cooled

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Old 09-09-2017, 01:26 PM
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Default B5 A4 2.8Q stalls at idle and won't restart until cooled

So... I just bought a 98 B5 2.8. It seemed fine other than an exhaust leak a week ago. Now, after it gets up to operating temperature, it will stall. After it stalls, or if you turn it off, it will not crank back up until it has cooled down. Once it cools it starts up and runs like there isn't a problem at all. No CELs at all.

I just changed the coolant temp sensor, topped off the coolant, and fixed a broken vacuum line. That didn't help. It will turn over like there is no tomorrow but it seems like the computer is telling it to not start - I even tried to clutch kick start it and it wouldn't crank then.

Any ideas? I have seen lots of posts related to this but not too many answers other than coolant temp sensor.
Old 09-10-2017, 09:29 AM
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What about the crank position sensor? Search for that.
Old 09-10-2017, 12:59 PM
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Originally Posted by clancy
What about the crank position sensor? Search for that.
I see how that would cause it to stall but why would that keep it from restarting?
Old 09-11-2017, 06:50 AM
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Often they fail when hot and work once they cool down. Only sometimes do they produce a code.
Old 09-12-2017, 03:49 PM
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Changed the crank position sensor today. It drove home fine. No stalling, No issues restarting. I hope that is all it was. Now I just have to address the dumpster fire that is my tires. Thanks for the help
Old 09-13-2017, 07:44 AM
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Good to hear. Best of luck.
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