[V6-12v] Car not starting

[Joe - Audi]

I agree with James on checking the fuel pump.  I had a similar situation
with my '94 100, where it died suddenly in the middle of rush hour traffic
on a busy highway.  But, in my case at least, after sitting for a few
minutes the car would fire up for a few seconds and then die.  Must have
still been getting some fuel flow.

Another thing to check would be the crankshaft position sensor (is that
the same as the Hall sensor?).  A few years back my car would sometimes
not start (after sitting), and would just turn over and over and not fire.
 Most times it would eventually fire after a few tries at cranking.  Every
time this happened I was at work and it was before I had my Prodiag, so I
never knew if it threw a code and I didn't have the tool to properly
troubleshoot.  It took the shop I went to a couple tries to find the
problem, so it may not have thrown any codes. (or else they didn't bother
to check, which is more likely the case...)

Good luck

-Joe

James Whitehouse said:
> I agree with this list of possibilities. However, I'd check the fuel pump
> relay first, then the fuel pump. Just because it's a one minute to the
> next
> fault and I wouldn't expect those others to be causing that type of fault
> (apart from the potato in the exhaust and even then I'd expect it to fire,
> run, then die). A fuel pump relay/ fuel pump itself, however, can be very
> much a 'working one minute, dead the next' problem and it doesn't throw
> any
> fault codes, which a lot of those other possibilities would.
> My fuel pump died as I was driving once - talk about instant, it literally
> just stopped working as I was going along and sedately drifted to a halt
> at
> the side of the road. A shot fuel pump relay would have a similar effect -
> little or no warning.
>
> Hope it's something simple like that.
> James
>