924Board.org

Guest · Posted: Sun Jul 08, 2001 3:20 pm Post subject:

From: Rob D
Email: robdumoulin@yahoo.com
Date: 08 Jul 2001
Time: 15:20:25

After taking some advice from the board, I did a little testing on my 1980 931. I took an ohm meter and tested the quality of the ground to my oil pressure gauge. I noted the ground showed resistance. By splicing a good ground into the brown ground wire on my oil pressure I no longer have the oil gauge bounce when I turn on headlights or turn signals. YIPEEEE.

Still have poor oil pressure when car warms up though and at idle, the oil pressure light and brake warning light comes on till you rev the engine. This occurs even when the pressure gauge says 2 bar. What gives?

Guest · Posted: Mon Jul 09, 2001 7:42 am Post subject:

From: Peter in AU
Email: Peter@planb.net.au
Date: 09 Jul 2001
Time: 07:42:05

How many more? Lots!

Remember you're talking about a 20 year old European car here. Wierd how the Euros never managed to work out how electricity works like the Japanese did. When you own a European classic, your multimeter and the Haynes current flow diagram are your new best friends.

The 924 engine tends to have low oil pressure when warm especially when compared to more recent engines. That said, the idiot lights are usually wired "correctly" all except the "charge" light which doesn't connect to anything remotely resembling the alternator output.

I'd suspect bad connections on the oil and brake warning lights but as they monitor a couple of fairly vital functions which relate directly to your life and the life of your engine, I'd suggest diving in with a multimeter to prove whether they are telling the truth or not.

I always find fixing electrical faults very satisfying, the process requires much more brain than muscle.

Peter in AU.