Ben:

Whatever the problem is mine sounds identical. I've
been trying to resolve an overheating problem on
uphill grads for some time. In addition (long before I
had the overheating issue) When I drive up the long,
uphill 5 mile road approaching my house the oil buzzer
goes off like clockwork as soon as I crest the hill
and pull into a smaller side road (rpm decrease). It
ewill buzz until I put automatic trans in nuetral and
rev the engine.

 Also...If I cruise at about 55 and then decelerate to
make a turn...it sometimes goes off.  My engine (one I
bought from VW) has @ 75K on it.I recently installed a
VDO Oil Pressure Gauge...some Readings:

Start Up 55-60 psi
At idle (warm)...low...like 8-10psi
30psi cruising at 50-55.
At the crest of the 5 mile-uphill pressure drops to
@ 20 psi as I crest...and the buzzer sounds...so it
seems I have appropriate pressure.

Also...I had a new oil sensor switch installed awhile
back... has not solved the issue.

Let me know what you find out.

kevin

--- Ben McCafferty <ben@KBMC.NET> wrote:
> Well, as you know I've been trying to chase down the
> oil light/buzzer issue
> for a while.  Mine occurs when exiting the highway,
> coasting in gear down to
> lower rpms; or when climbing hills at low rpms (i.e.
> approaching 2000 from
> above).
>
> I installed the VDO 80psi gauge from egauges.com,
> and got the dual terminal
> sending unit.  I used Bill Davidson's great article
> from vanagon.com, with a
> couple of minor modifications--wanted to be able to
> remove the engine tin
> without removing the sender, so I notched the tin
> instead of just making a
> hole, and used a 5" hose instead of 3.5".  It works
> great, and no leaks.
>
> Now then, just took a trip through western CO, and
> had lots of opportunities
> to pull mountain passes and load up the engine.  I
> am running Mobil 1 15W50
> synthetic (2.1L WBX).  I did get the light/buzzer to
> come on several times
> while climbing passes.  Every time it happened, the
> gauge read 20 PSI on the
> nose.  No fluctuation.  So I'm confused.  If there
> was a sudden drop in
> pressure (to activate the idiot light), wouldn't
> there be a corresponding
> drop in pressure on the gauge???  Is 20 PSI a
> threshold for the idiot light,
> i.e. the engine should never drop below that?  If
> that's the case, why can I
> idle at 8PSI with no idiot light?
>
> Anyway, I was glad to see that I did in fact have
> pressure, but I would be
> glad to hear theories about what's really going on.
>
> tx,
> bmc  :)
> "Faith will move mountains, but you'd better bring a
shovel...."

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