Hi Lyn,

Sorry to hear of your problems.  I've experienced these symptoms
before on my 89 Syncro Westy.  The problem was a leak in the
connector pipe where the o2 sensor is connected.  The O2 was getting
faulty readings because the exhaust was leaking at the flange.  Not
by much but enough to throw off the computer.

Try running with the O2 sensor unplugged and this should remediate
your problems.  If this does it, check your exhaust system to make
sure there are no leaks and you may need a new o2 sensor.

The O2 sensor takes a big funky socket or a big wrench without much
leverage room to work to loosen it if it has been burned in place for
a while even though it is not supposed to be torqued to much.

Hope this helps,
Joel
89 Syncro Westy MV
Rochester NY
--- Lyn Hartley <hartleyl@INAC.GC.CA> wrote:
> Dear folks:
>
> I am needing your advice on my '91 Westy.  She is running quite
> rough when out on the open highway (though not around town).  As
> you can imagine there is not a lot of mechanical options to pick
> from in the Yukon (no VW shop) so I thought I would give this group
> a try.
>
> Symptoms:
>
> *Sudden lurching when driving on the highway (usually after 10-15
> minutes).
> *With the lurching comes a loss of power (press on the gas and
> nothing happens for about 30 seconds).
> *Lurching happens intermittently.
> *More pronounced when going up hills.
> *Black smoke following "lurch".
>
> What I have tried:
>
> * I just replaced the airflow meter and put in a new one.
> * I replaced the wiring harness (p/n025906302) a year ago.
> * I don't drive it in the winter.
> * Checked the wiring.
> * It has an new engine... only 2year old (and only used in the
> summer)
>
> Any thoughts?
>
> Many thanks, Lyn Hartley
> Whitehorse, Yukon

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