[V8] Intermittent engine shut off

[Ingo Rautenberg]

John,

By the sounds of it, it's the typical symptom of s failing engine speed
sensor. After many, many heat cycles, it often will exhibit the symptoms you
describe before failing completely.  Might be a good time to replace the
engine crank sensor at the same time (they're exactly the same except one
end is colored black and the other sensor end is grey -- though if I recall
correctly, you don't have a choice of color anymore). They both mount
together on the same bracket with heat shield.

-Ingo
On Oct 3, 2011 6:19 PM, "John Bysinger" <doog at bysinger.net> wrote:
> My wife primarily drives our V8 so this is currently 2nd hand info, I'm
> hoping to see if I can replicate the problem in the next day or so, but I
> thought I would post first to see if anyone has recommendations on what to
> check out first.
>
> 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.
>
> 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.
>
> 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.
>
> I plan on blinking out codes tonight to see if the ECU has anything to say
> about it and will report back my findings afterwords. Any BTDT insight
> would be appreciated! :)
>
> -John
> john at bysinger.net
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