87 5KQ Quits After about 30 miles. Works after rest

[Doug Johnson]

I had a similar situation with an 85 4kq.  It was particularly troublesome
in warmer weather.

After a local wrench replaced the fuel pump, without any diagnosis, I
finally figured out that continuity in the circuit was faulty.

The future owner (Sean, are you out there?) informed me that he just spread
the terminals on the relay a bit, so they made better contact with the
sockets in the relay board.

 ~ Doug


> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Ti Kan
> Sent: Wednesday, September 17, 2003 8:18 PM
> To: Matt Ammann
> Cc: Quattro List
> Subject: Re: 87 5KQ Quits After about 30 miles. Works after rest
>
>
> Could be a number of things, but fuel pump or fuel pump relay are
> suspects.  When the problem occurs, you can check by removing the
> fuel pump relay (location 10 in your fuse/relay box), and then
> jumper the relay socket between the two biggest contacts with a
> piece of fused wire.  You should hear your fuel pump run.  If not,
> then the fuel pump ist kaput.  If it does run, then maybe the fuel
> pump relay is bad.  Try swapping it with another one and see if
> your problem recurs.
>
> The fuel accumulator is not associated with the type of problem
> you describe, so you can rule that out.
>
> While you're in there, check the conditions of your ignition wires,
> distributor rotor and cap.
>
> -Ti
> 2003 A4 1.8T multitronic
> 2001 S4 biturbo 6-sp
> 1984 5000S turbo
> 1980 4000 2.0 5-sp
> --
>     ///  Ti Kan                Vorsprung durch Technik
>    ///   AMB Laboratories, Sunnyvale, CA. USA
>   ///    ti at amb.org
>  //////  http://www.amb.org/ti/
> ///
>
> Matt Ammann writes:
> > My 87 5KQ, no turbo, has run out of stamina.  It seems
> > to quit running after about 30 miles or so.  If I let
> > it rest for
> > ten minutes, it will start up and run for another
> > while.
> >
> > After letting it rest for a couple of months, then
> > replacing the
> > fuel and air filters, I was able to get a couple
> > hundred miles out of
> > it before it started crapping out again.
> >
> > I've a working hypothesis that it is starving for
> > fuel, and surmise
> > that either the fuel pump is having issues, or the
> > fuel accumulator
> > has some sort of problem.  Any thoughts on things I
> > could check
> > out relatively easily?
>
>
>