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From: Calvin Sambrook on 5 May 2010 08:59
"Calvin Sambrook" <csambrook(a)bigfoot.com> wrote in message
news:hrmoc7$cc3$1(a)news.eternal-september.org...
> Hi,
>
> I wonder if anyone has any thoughts on a problem I'm having with my
> old-style (1995) VW Sharan.
>
> Every now and again the engine dies but only for a very brief period, less
> than a second I'd say although I've not been timing it. The effect on the
> engine power is as if I'd turned the key off, the car slows very quickly,
> much more quickly than simply lifting my foot off the pedal. At the same
> time all of the electrical stuff *except the rev counter* stays completely
> normal.
> The rev counter is weird, when this happens the rev counter dies away to
> zero almost instantly, clearly it's not reading properly as the car is
> still in gear and moving so the engine must be rotating.
>
> This fault is proving very difficult to diagnose as it only happens
> occasionally and only when it wants to. My guess is that if I can find
> out what the rev counter actually counts I'd be a long way to diagnosing
> it. Does anyone have any ideas?
>

Thanks to everyone who responded to this. The pointer to the crank sensor
led me to research that area and it seems quite a common problem, not only
that but descriptions of the fault conditions by others precisely match
those I'm experiencing.

I'd very much love to read the fault codes on car but that seems to be
something of a problem in its own right. It's a 1995 VW Sharan and all of
the info I can find about code readers implies that OBD-II started from
1996. I've borrowed a bluetooth reader made by OBD-KEY but it refuses even
to communicate which sort of backs up my feeling that its not OBD-II. The
connector is OBD-II style and there are wires going to it but I've read that
between 1994 and 1995 some cars were made with OBD-1.5 which used OBD-I
comms through an OBD-II connector!

I'm trying to find a local garage that will do a multiple read for me (as in
read-reset then read again once the fault has happened) as I've been reading
that some of the more professional kit can cope with OBD-1.5.

So, I'm not fixed yet but I'm confident that I can be!

Again, many thanks.

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