Thanks, No problem is consistent, definitely not "vanagon syndrome" I'm
thinking it may be a fouled injector or maybe one cylinder has very low
compression or it's a bad plug wire ?

-john

On 2/19/2011 4:36 PM, Robert Stevens wrote:
>
> On Feb 19, 2011, at 5:12 PM, John Goubeaux wrote:
>
>> I'm on the road and several hundred miles from home ( southern CA) and
>> my 90 Vanagon has begun to run bad. It is missing and has a serious
>> reduction of power when under load. It starts up and idles, but is
>> running real rough, no backfiring though. Its almost as if there is a
>> fouled plug or bad ignition on one of the cylinders
>
> Wondering if this is what you have going on:
> ""Condition: After driving for an extended period of time at a
> constant speed, the vehicle may, on occasion, experience a
> deterioration of performance which may be accompanied by hesitation or
> surging. In many cases, after turning off the engine and subsequent
> re-start without having taken any action, the symptoms disappear.
> These symptoms may not recur for several weeks or months."
>
> "Service: To resolve this condition, wire harness Part No. 025 906
> 302, should be installed. This harness provides improved signal
> voltage stability."
>
> Remove electrical connector from air flow sensor. Install wire
> harness, Part No. 025 906 302, between main harness connector and air
> flow sensor connector.
>
> Part numbers are for reference only. Always check with dealer for
> latest parts information. As of 6/1/98, it was still a good number
> with list price of $138. VW calls it a "transformer" and the technical
> bulletin does indicate there are "active components" in the harness,
> so the old manual's trouble shooting resistance of the circuit are no
> longer valid. They are given in the bulletin.
>
> To test the new harness, continuity between ends readings should be:
> #1, 0 ohms; #2 greater than 1 megaohms; #3, 4 & 5, 0 ohms."