Once the high pressure warning is activated, it remains on until the
system see the high pressure switch satisfied or the ignition is reset. My
bet is that as you come down to idle, the circuit is activating on low
pressure while still above the rpm set point. This is most likely
happening after the highway drive or hill climb. Since it is intermittent,
my bet is a marginal oil pressure problem.

Check the oil level and are you using the proper viscosity? Oil level
should be between the marks, not at or above the full mark. Yes, this
makes a difference. It is also possible the pressure switch is a bit
flaky. Also make sure the cooling system is running properly. High water
temp will make for high oil temps.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Ryan Shawley
Sent: Saturday, June 30, 2007 8:24 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Oil Pressure System Confusion...

Regarding the dynamic pressure warning system on the 86 and ups;  I get a
flashing light and buzzer scenario at idle once in a blue moon, according
to everything I've run across this means, uh nothing?  The buzzer
shouldn't buzz at low RPM right? (assuming true warning).  I plan on
running through the Bentley troubleshooting tomorrown but I feel like I'm
going crazy.  So if I get this right for true low pressure the light will
come on at low RPM and the light and buzzer at high RPM?