Re: Failure means progress, right? XN6 no-start diagnosis help needed
From: kenneth parker (elkeni@mac.com)
Date: Mon 26 May 2008 - 23:09:27 EDT
I had a similar problem with my same year, same model, 505 and it
turned out to be the fuel pump relay. The car would run fine for a
while and then simply cut out. After waiting several minutes
(allowing the relay to cool off) it would start right up and run
until the relay heated up and then it would cut out again. This may
sound crazy, but I would try loosening the fuel distributor line
right after it stalls to see if you are getting fuel when the relay
is hot. If that happens, try running a jumper wire (at the relay -to
the left of the steering column) to bypass the relay. Actually, in
my case, it turned out to be the "pigtail" plug that connected to the
relay that was bad and baked the relay. It is kind of a pain to
expose the relay and it is the hardest to reach under the dash.
New relays are expensive, though you should be able to find one at a
wrecker. Volvo and BMW both use a similar Bosch relay. I think I
ended up getting rid of the pigtail (7 female connections) and
installing a 6 connector Volvo relay instead. I swear this will make
sense once you have a good look at the relay.
Good luck,
Ken
On May 26, 2008, at 5:34 PM, zumkopf wrote:
> My new (to me) '84 505 XN6, when I first got it last winter, behaved
> oddly in that it would run for about 20 minutes, then stop on its
> own, and would often not restart. It did not matter if it were being
> driven, or idling still: it would suddenly stop. Shortly, I couldn't
> get it to start at all. As it was winter and I have no garage, I
> left it alone. Fast forward to spring. On a lark, I tried to start
> it; after a few seconds of cranking, it caught and ran for about ten
> seconds. Then it died again, and would not restart.
>
> Battery is fine. Cranks strong. Fuel pump is running (buzzes fairly
> loudly). I tried loosening the connection at the fuel distributor to
> check for fuel flow, and fuel sprayed freely. So I'm guessing it's
> not fuel. I then checked for spark, as suggested by Haynes (is this
> the right way to do it?): I pulled a plug lead, placed it near a
> ground (intake manifold) and had my son crank the motor; no spark. I
> did the same with the main lead from the coil; again no spark.
>
> What next? What's the method for checking the coil? Haynes is
> pretty obscure on the topic. Would a bad coil explain the previous
> problem, running for a while and then dying? How does one check the
> ECU? What else could it be? Was my spark check method incorrect,
> and could it still be fuel?
>
> I appreciate any advice on this. I'd love to get the car running,
> what with diesel at $4.50 a gallon.
>
> Marty
> '85 505 STI TD Auto
> '84 505 STI XN6 5 speed (motionless)
>
>
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