Fuel Pump Relay question

[Ben Swann]

OK - I have that distributor.  They don't typically fail like you describe.
More likely the connector may be faulty.  Have you visually inspected the
wires in the connectors and that go inside the distributor.  Again, the Hall
sensor is fairly simple with few moving parts to fail - the wheel that spins
around is the moving part and wont go bad unless it has been smashed with a
hammer.

But installing a known good distributor may rule in/out as a possible
culprit.  Reply back directly regarding the distributor.

Have you cleaned up all wiring to the coil posts?

Have you tried substituting one of the Orange load reduction relays in place
of your F.P. relay.  This is OK on this car as it is merely toggled on with
ignition.  Just need to source an extra.

I have to admit, intermittant problems are a PITA.  Things I'd rule out for
now include the temp sensor.

Ben

----- Original Message -----
From: "Chris Hall" <badcomrade at gmail.com>
To: "Ben Swann" <benswann at comcast.net>
Cc: <quattro at audifans.com>
Sent: Monday, June 06, 2005 12:15 PM
Subject: Re: Fuel Pump Relay question


1985 Audi Coupe GT.

So anyway... I'm not sure if the hall sender -test- would be of much
use, because -most- of the time, the hall sender -works- or else the
car would -never- run.  So, I'm guessing 99% of the time, if it is the
hall sender, it'd test out OK.

Having watched the switch inside the fuel pump relay turn off a second
or two after the engine died, I have to say the fuel pump relay is not
the problem.  Seems like the ECU decided to shut down the engine, and
shut the Fuel Pump Relay off after it killed the engine...  That could
be because the Hall Sender quit sending the 4.5v square wave to the
ECU, or the ECU didn't see a signal from something else.  I tested the
ECU's coolant temp sensor when it was cold, and it tested at 2700ohms
or so, which I'm told is in spec.  I have NOT tested it when it's
hot...

What other things besides the Hall sender and the coolant temp sender
does the ECU freak out over if it isn't getting signal from it that
will make it shut the engine down?

That's what sucks about intermittent problems... they're hard to catch.

What about my idea of narrowing down what can cause these cars to
backfire?  Half the time when it starts acting up, the engine drops
out and will backfire, then kick back in..

:SNIP:

On 6/6/05, Ben Swann <benswann at comcast.net> wrote:
> Chris,
>
> You need a distributor? For which car again.
>
> I think a good concise recap of the problem may be good, as you have lost
me
> in the discussion on this one.  Do you have a Bentley/Service manual -
> checking the Hall Sender portion of the distributor is a straightforward
> procedure.
>
> Anyway,  I likely have an extra distributor, just need to specify which
> vehicle.
>
> Ben
>
> [From: "The Loves" <theloves at localaccess.com>
> Subject: Re: Fuel Pump Relay question
> To: "Chris Hall" <badcomrade at gmail.com>, "Ed Kellock"
> <ekellock at gmail.com>
> Cc: quattro at audifans.com
> Message-ID: <003d01c569ee$9705cd80$6401a8c0 at tom>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Can someone lend Chris a known good used hall sender?
> My vote is the hall sender.]
>
>


--
Chris Hall
badcomrade at gmail.com
"making girls cry since 1974"