At 08:13 PM 4/4/2012, Steven Sittser wrote:
>The buzzer comes on and the light starts flashing only under the
>following conditions:
>(1) It's hot outside, or at least pretty warm, and
>(2) I've been driving at highway speeds for at least
>     about 10 minutes, and
>(3) I decelerate (usually getting off the highway), and the
>     engine RPM's are below about 2000.
>
>If I raise the RPM's above about 2000, the light and buzzer go off,
>then come on again if the RPM's drop back down again.  This goes on
>for 5 or 10 minutes, after which it will usually get tired of me
>ignoring it and the buzzer and light will go off.

Faskinating!  While I'm not intimately familiar with the workings of
the "L-board," I find it difficult to account for the reversed RPM
behavior without positing a logic failure on that board.

Begin by unplugging the sender wire from the sender on the after face
of the engine, just left of the crank pulley.  Then run the engine
and see what happens.  What *should* happen is that with engine
stopped, key on, you'll see blinking light but no buzzer.  After you
start, no light or buzzer until ~2000 rpm.  Above that the light and
buzzer should come on.

Report your results.

Yours,
David