[V6-12v] 96 A6Q Avant intermittent hot start issue

[James Whitehouse]

Eric,

Anything causing an intermittent no-start problem should store a code, but since it's not, a little detective work is in order.

My money wouldn't be on the Hall Sender (cam position sender). For the simple reason this would not cause a starting problem only when the car is warm, but at any engine temp. 

My guess would be something along the lines of the coolant temperature sender (the two-pin ECU sender NOT the 4 pin dash sender). This can cause start problems if the ECU isn't getting the correct temp data. As always, check the wiring, as well as the actual component itself.

James


Eric Huppert <ehuppert at hvc.rr.com> wrote: Gents,

Had bought, rehabbed and sold ($1k in parts) a clean 96 A6 Avant in the
fall. Was sold locally to a guy I know...

He just called and they're having a intermittent start issue. Occasionally
car won't start (when hot), but if allowed to sit will start after a while.
Tonight they had to let it sit for 45 minutes before it would fire.

//Today's update!//

Looked at car a few moments ago. No CEL, no codes stored (VAGCOM). Fuel pump
is/does run. Car sat for a while and didn't start, but immediately tried
again and it started right up. Couldn't duplicate the problem, of course!!!
Did put a new oem ignition switch in in Dec, so thinking that probably isn't
the issue

Have had some replies indicating cam position sensor may be the culprit.
But, wouldn't that store a fault?

don't have any manuals, Bentley or otherwise, for the A6 and haven't been
able to find any info on troubleshooting the CPS on the web. Possible for
someone to scan the appropriate pages, or give me the procedure? Assuming
it's a ohm check, but need to know the pins/resistance values. (If this was
a type 44 it would have already been fixed! haha)

Thoughts?

Thanks,
Eric

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