If it goes off only at rpms>2200, the engine tin should not be
involved.  The high speed sensor is at the rear of the engine near the
crank pulley.  Check the wire connecting to it and then check whether
it provides a connection to ground which changes with engine speed.

Larry A.

On Sun, Aug 1, 2010 at 12:55 PM, David Clarkson <Dvdclarksn@aol.com> wrote:
> Time for some diagnostic work I'm afraid. In my ten years of owning my 90
> Westy I have never had this warning activate. It went off just yards from my
> �driveway fortunately (thank you Van Gods). I checked it again this morning
> and �it does magically activate at 2200 RPM's. I have perused that Archives
> and will �set out to check all of the wiring and also for leaks at the
> sensors. Of course, �I have 15w-40 Mobil 1, correct oil level , Mahle filter and
> no apparent issues �with the oil itself. Quick check doesn't show any
> corrosion at the connector �that splits off the wiring to each of the sensors.
> Not looking forward to �possible removal of exhaust nuts to remove the engine
> tin. I have had some sort �of slow oil leak from behind this tin so I'll
> check this too. Wonder could it be �a leaking sensor? I had the van up on a
> lift cleaning off dye in the AC for a �known leak at one of the condenser
> connections (another frustrating problem now �secondary to this frightening issue
> ) then after driving about 15 miles �home it went off and my heart sank.
> Just don't have the money in the budget for �the Subi 2.5 transplant yet. The
> only other likely possibility not near the �engine area that might explain
> this issue is the sometimes problematic 14 point �ribbon connection at the
> speedo that is very fragile with a broken corner of the �plastic that the
> ribbon folds over and the connector slips on to. According to �the archives this
> connector carries the wiring from the sensors. Guess its time �to get her
> up on ramps (don't want to drive back to work to use the lift should �I have
> a true oil pressure issue) and scrape the knuckles and try not to use my
> outside cursing voice. The engine was rebuilt about 100,000 miles ago by The
> Bug �Shop in Blacksburg, Va. -Plug for the Bug Shop and Jewel the
> owner-excellent �rebuild IMHO. It was broken in on conventional Dino oil for the first
> 10,000 �miles and then nothing but 15-40 Mobil One. Oil changed every 7,000
> miles and �filter change every 3500 miles. I'll report back on my findings.
> Got to have her �ready for the trip to the Outer Banks without breaking the
> bank in two �weeks.
>
>
>
> David �Clarkson
> 1990 Westfalia
>