Failure means progress, right? XN6 no-start diagnosis help needed
From: zumkopf (martin.karo@verizon.net)
Date: Mon 26 May 2008 - 20:34:44 EDT
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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