Blinking lights, 80tq

[Huw Powell]

> I am searching for idea's here please, on my 80tq, the
> coolant light flashes intermittently, even though the gauge
> clearly shows the car is not overheating, bleeding the air
> from the system, and filling the reservoir to the top do not
> help.  Also, I tried another complete reservoir, and it did
> not make any difference.  Any other suggestions other than
> banging on the reservoir to loosen a stuck sensor?

Replace the MFS on the underside of the top coolant neck, maybe.

Unplugging it is enough to see if it is the problem.  It was on my 90Q.
  Twice.

I think even your transplant engine will have one.  Maybe it is not even
wired right yet?

> Also, when warm, the oil pressure light flashes under
> 1000-1200 rpm.  Has anyone completely figured out the
> low/high pressure warning system on these vehicles, I did
> not hook up the RPM input since I am not using the old coil
> wiring from the 1988 80q, there are 2 extra green wires, and
> a red/? wire that I have not hooked up from the 80 coil
> wiring.  My theory is that at warm idle the oil pressure is
> below 1.8 bar, and in the absence of the rpm signal, it has
> no way to ignore the 1.8 bar sender, and turns on the oil
> pressures warning light.  Any recommendation other that
> pulling the relay?

If you have a gauge you can see and trust, you could do without the
warning system, but I'd be inclined to keep it if I could.  The wire
that gets the rpm signal to the control unit is the "same" one as the
wire that runs the tach - it's usually a three colored wire, R/Bk/Y, as
I recall.  of course I don't know how much of the original wiring and
systems you have retained...

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/