[V8] Intermittent engine shut off

[dsaad at icehouse.net]

Mine failed a few years ago.  I can't imagine how it could cause a stall
but maybe the automatics are different. The failure was typical of others
on the list - the speedo started to drop to zero now and then - and it
seemed like a whack on the dash brought it back.

Dave



> yJust a little note there is one more sensor other than the timing or
> reference sensor. The speedo sensor, works on the same principal as the
> timing or reference sensor. This is found inboard of the front Axel on the
> trans .
>
> I had one a few years ago that went and caused the same symptoms. I've
> never heard of anyone else having a problem with their speedo sensor.
>
> cheers superdave
>
>
>> From: tonyandlillie1 at earthlink.net
>> To: john at bysinger.net; v8 at audifans.com
>> Date: Thu, 13 Oct 2011 20:14:25 -0500
>> Subject: Re: [V8] Intermittent engine shut off
>>
>> > The car is a 1990 V8Q with ~ 170k miles on the clock, she's getting a
>> bit
>> > tired but generally still performs well other than a little puff of
>> smoke
>> > after idling at a light.
>>
>> Sounds like time for a valve job, good excuse for a port and polish as
>> well
>> ;-)
>>
>> > Over the weekend she said it shut down while driving but started back
>> up a
>> > half second later 3 times, happened fast enough that she didn't need
>> to
>> > pull
>> > over. One time it died at a light but she was able to start it back up
>> > immediately. Today after driving 15 miles to her destination, then
>> > 14.9ish
>> > on the way back home it died about 4 blocks short of the house.
>> Refused
>> > to
>> > start back up. After calling me for help and letting it sit for about
>> 15
>> > minutes I had her try again, started and was able to drive the last
>> couple
>> > of blocks home.
>>
>> More than likely a timing or reference sensor. They are the same as 5000
>> turbo ones, other than the 5000 ones have longer leads. However, they
>> are
>> usually significantly cheaper.
>>
>> > Incidental symptom that may or may not be related (probably more to do
>> > with
>> > overdue ignition service) is when mildly accelerating the power seems
>> to
>> > pulse, like power is applied in a wave rather than a steady
>> acceleration,
>> > roughly 1s intervals. Hasn't been enough of an issue to fret about
>> just
>> > yet
>> > so I've let it slide.
>>
>> Time for a 4-wire O2 sensor. very inexpensive compared to the OEM V8
>> 3-wire,
>> and gives it a dedicated ground. Get one for a 1993 Ford F150 5.0. I
>> also
>> wire in the opposite side plug, so future changes are quick and easy.
>> BTW,
>> your 3-wire relies on the exhaust system for it's ground, probably not
>> such
>> a good reference point after all these years. Cured my V8's surging.
>> Felt
>> like it was accelerating in 50RPM increments to me.
>>
>> P.S. Sorry I'm a little late on this one, hopefully it still helps,
>> Tony
>>
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>
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