[s-cars] Cutting out at speed

[mike claire]

Thanks Randy, I replaced the fuel pump about 20K ago.  I don't suppose
that's reason to rule it out.

But somebody here doubted my theory about the fuel pump relay, since the
cutout is instantaneous.  I think he's right - if the fuel pump relay cut
out (or if the pump itself were weak) the car would need a few seconds to
starve, and then die.  I wouldn't get the driveline shock I get when the
power cuts out in an instant.

Bob Myers says he had my exact problem, and it was a bad 1.8T ignition
harness.  I don't doubt him, but I don't understand how a coil harness can
fail that way - going from 5 cylinders to 0 instantly.  But I should
probably check my grounds.

I'm going to jiggle the ignition switch next time this happens.  Anybody
ever had an ignition switch give my symptoms?





On Mon, Aug 17, 2009 at 8:54 PM, McCall, Randy <rmccall at nexant.com> wrote:

>
>
> Date: Mon, 17 Aug 2009 16:34:49 -0400
> From: mike claire <mike.claire at gmail.com>
> Subject: [s-cars] Cutting out at speed
> To: "S-Car-List at Audifans.Com" <s-car-list at audifans.com>
> Message-ID:
>        <d219f42d0908171334h27a6212ao3c0b44ff65d89787 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Sorry to posting a question before even blinking out the codes.  But I'm
> 40
> miles from home, and I have a problem that's suddenly getting a lot
> worse
> very fast.  I'm about to get back in the car and hopefully get it home
> before the traffic's too bad.
>
> The car suddenly and without warning shuts down while driving at steady
> speed on the highway.  I can't be sure if it's ignition or fuel, but
> there's
> no stumble - it goes from running great to not running at all.  So far
> it
> has only happened during steady cruise at 75/80 mph.  Speedo and tach
> still
> register correctly after the stall.  No CEL.
>
> I can restart the car and resume travel before the car even slows to 65
> mph
> - it starts right back up like there was never a problem, no matter how
> hot
> the car is, and it ONLY fails while driving.  So I do NOT suspect the
> CPS
> (which was replaced about 40K miles ago).
>
> I'm thinking fuel pump relay.  Looking for ideas - what else could
> behave
> this way?  I'll blink codes tonight and report.
>
>
>
> Mike
> _________________________________________________
>
> Mike
>
> I had a 200 10V that exhibited your symptoms - flying down the freeway,
> alls well, all of sudden, nothing, nada, pull on over before you get
> hit.  Wait 10 seconds, engine starts fine.  Kept doing that all the way
> back home (only 10 miles or so), and got worse as I kept driving.  Fuel
> pump change put things back to rights once I was home and could steel
> myself to go fuel tank diving.
>
> -Randy
>
>
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