Hi,

Sounds like the oil pressure buzzer. It is an annoying "high C" sound
and starts when the engine hits 2500 rpm. The buzzer is located under
the dash/instrument panel.

You might want to check the connections to the oil pressure sending
units - the one that sets off the buzzer (high pressure sender) is
located near the crank pulley. The two sensors have a common
connector to the main harness on the left side of the engine. To do a
quick check on the high pressure sender, you can ground out the
connector. If the buzzing continues, then there's a fault somewhere
in the wiring harness. If it stops, then the problem may be with the
sensor, or worse....

Ric

At 06:55 AM 11/17/2007, mordo wrote:
>Fellows: I need some quick help because I'm leaving on a trip today and am
>concerned about a sound alien to me. I posted at the Samba too so I've
>pasted that below:
>
>
> > Last night, I drove a 8 mile errand trip, stopping once. On my return
> > trip, I was baffled by a sound I have never heard. At first I
> thought it was
> > interference on my radio as I was passing a group of television transmitter
> > antennae. However it continued after I turned off the radio.
> >
> > The sound occurred twice and both times it was a slow crescendo to about
> > high C. I can't say what RPM it occurred at for sure but I would guess
> > around 2500 RPM. The sound seemed to stop when I let off the throttle but
> > maybe it didn't stop immediately. The outside temp was about 40F.
> The engine
> > was well warm but not highway hot.
> >
> > A few days ago, I changed the oil from Castrol GTX 20/50 to Mobil 1 15/50.
> > I always use a Mann filter.
> >
> > There was no flashing light. Is this the sound of the oil pressure warning
> > buzzer? If so, it seems silly. It is too vague to be an alarm if
> you ask me.
>
>Thanks in advance for the help.
>
>
>--
>mordo
>1990 Carat