Strange behavior- ECU/ignition?
smitty at pcrealm.net
Mon Sep 13 15:43:31 EDT 2004
DGraber460 at aol.com wrote:
>I have over the years had my car (83 URQ) on rare occassion behave very
>strange with no clue as to why.
>What happens is out of the blue, driving down the hiway at 60-70, the tach
>will suddenly to drop to zero and bounce up & down as it comes on and off
>line. The car then backfires violently at the same time. It starts with once
>every 15-20 seconds and becomes more and more frequent until the car finally
>stops altogether. Switching the car off, and restarting (rebooting the computer)
>and all seems fine.
>It has only happened 4-5 times over the years, but did it twice yesterday as
>I was returning from the West Coast UPG in the middle of Utah, and western
>Colorado (miles from anywhere). It is not heat related, and pedal input &
>jiggling the ignition switch have no effect. Is there anything in the ECU maps,
>programs, or electronics that could cause such a thing?
>This has me totally stumped!
>It will go months or years between episodes- although yesterday it was 3
>hours and 240 miles apart.
>quattro mailing list
>quattro at audifans.com
Dennis, I experienced the same problem a few years ago and it was
maddening to track down
due to it's intermittent nature. I did replace one of the fly wheel
sensors (speed sensor, on top of
the bell housing for WX motor). I would recommend buying new ones,
(both) since they do not have an
infinity life. I replaced my ign. distributor as well, bought a new one
for $90.00, and never had another
Since the refference sensor is out of the loop after starting, I doubt
that that is the problem.
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