Lex_GTX

Some advice is greatly appreciated from people that have seen more 951s than myself.

I've replaced the sender to the gauge as it would peg at over 5bar. The new sender works and gauge works fine except that at hot idle when it sits between 2 and 3 bar the needle flickers ever so often. It goes down to 2 then quickly flickers back up to 3. When driving it does not flicker and is around the 4-5 region depending on RPM of course.

Is this a common electrical issue with the gauge/wiring or more indicative of a mechanical problem with the OPRV?

Thank you in advance

savvas944

cracked oil pickup pipe in the sump?

s14kev

Mine does the same. I get the impression that this is normal.

Scott H

Yup, this is one of those "nature of the beast" sort of problems. So either it's supposed to function that way, or all of us have some crappy grounds going to the gauge cluster.

Lex_GTX

I have some fun electrical issues that I am currently working through - low readings on the voltage gauge, some stumbling associated with this, even my engine temp gauge sometimes flickers a bit.

I just wanted to verify it's not a mechanical problem (ie it's common)

kinglenario

Same here. Sometimes electrical load visually changes my oil pressure gauge. Less than 1/16" of movement but it happens. I think it's grounds. These cars even when new didn't have the strongest electrical system.

jerome951

The oil pressure fluctuations sound normal, but you've got other issues going on. Clean the engine and body grounds (back of engine, firewall, and battery posts) and see if that resolves the problem.

Lex_GTX

Yes, I know I have to clean everything.

Is there a trick to getting to the main battery ground on the bellhousing? I cleaned the small ground (10mm) but the 13mm one from the DME and battery is very much tucked under the heater valve.

Ben951S

Don't forget the grounds under the dash... you know, the ones the cluster probably depend on... =)

kinglenario

this is by far the best stuff on the market for cleaning electronics connections.

Caig Deoxit

Baptizo

At least your's is working, mine is now pegged out to the max and I need to replace the sending unit.

Lex_GTX

Had that issue a couple of days ago so I already replaced mine. I am dreading the removal of the 13mm ground on the bellhousing.

Baptizo

Thanks for the link!

kinglenario

no problem. i need to try getting on to those bell housing grounds and loosening them and getting some de-oxit on there. can they be loosened a little without too much trouble? With that caig stuff you don't really need to brush it.

i use that stuff all the time, especially to keep this lathe running (below). it's german too. porsche should have taken their lead on the electronics though!

Neumann Lathe

supes6

Mine flickers sometimes too... even with a new sender and mostly new engine harness + battery cables.