[Bulk] Re: Oil pressure warning at 2800 rpm, 1988 90Q

[Huw Powell]

urq wrote:
> I would expect the switch in the pressure sender for the gauge would be used
> as the low pressure sender ... that is how most similar sending units are
> set up.  The high pressure sender would be the one on the spark plug side of
> the block.

They both are, last I checked.

>  This sender is also reverse logic from the low pressure switch,
> it is open at low pressure and closes at higher pressure.

That's so a bad sender throws an alarm.  Don't know why the low sender 
isn't that way too - maybe they learned something along the way?

> I suspect that
> the circuit to the high pressure sensor is open or the sender is bad, this
> would cause a situation where the monitor module is expecting to see the
> switch close, but it never does, and you get the warning at higher RPMs. 

Well, he did say that the two-pin sender is unplugged due to the 
terminals being busted off.

> If you have an oil pressure gauge it does tend to make the high pressure
> monitoring module of little use ... 

I dunno, if you let the oil get low, a hard (right) corner will set off 
the buzzer, which isn't usually a time I am looking down at the gauges. 
  Of course, the first thing I do if I hear that buzzer is check the 
gauge to make sure my oil isn't all on the road...

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/