1984 4k - no start
audi at humanspeakers.com
Sat Sep 19 16:14:01 PDT 2009
> Well the car starts and runs. After its warm though, it no longer
> starts. Today it would need to sit for just a few minutes before it
> started again.
This is common issue which Audi altered quite a few things over time to
"prevent". It could be a combination of a faulty fuel check valve
(letting pressure drop) and heat soak at the head, vaporizing fuel in
the injector lines. Can result in long cranking, or even no-start until
things cool a little.
Heat buildup has also, IIRC, been implicated in intermittent Hall
senders on the dizzy.
> While running, I can tell it isn't running well on the low end.
Might be a completely different issue.
> For the no-start the O2 sensor may make sense as it seems to have
> trouble after warm up.
O2 sensor not used while starting. Easy to test when warm running,
though - voltage should cycle up and down between about .3 and .7 volts
DC every few seconds.
> For the not running well - I'll take a shot at the DPR.
> Now to your comments - I thought the DPR was the assembly directly
> over the fuel meter arm sitting on top of the airbox. Which is the
> fuel distributor?
The DPR is the little grey box on the front of the fuel distributor with
an electrical connection. Two bolts hold it on; there are two small
o-rings to make sure you don't lose (or have new on hand).
Have you made sure *all* the electrical connections (especially CIS ones
of course) under the hood are clean?
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