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Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

My car has a very low oil pressure ( 2 bar at 3500 Rpm in 3 rd gear)
This happend from one day to another, what couldt be the cause?
Are oilpumps failing slowly or do they die instantly? Also it shows a kind of rough idle when cold, sort of cutting out ignition ...??
Normally it idles at 950 and pressure was at 4-5 bar when cold, now i only got 50% of that value. Any clues?
Driving is like normal, but these low readings make me nervous.......

Nobbi

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NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

maybe guage. Check with diffirent guage screwed directally to engine.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

After you verify your readings mith as mechanical gauge, as suggested by Joe C, smell your oil cap to make sure it isn't contaminated by fuel.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

What weight oil are you using?

Thin/light weight oil will give yield low oil pressure when hot.

You should be using 20W/50, and conventional motor oil will give you higher oil pressure than synthetic.

Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

Thank you for the responses, i checked for fuel smell- thats not it.
Then i took out my gauge cluster (replaced all the def.lamps) and sprayed a lot of wd40 into it, build it back in and.....
yes,fine readings on the voltmeter and oil pressure.
Great thing to know pressure was and is good!

thanks again, N

obbi
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NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967

JayZzzz4 · Joined: 23 Sep 2008 Posts: 544 Location: Milwaukee, WI USA

This just happen to me yesterday. I drove my car around for about 10-15 min after 8hrs of changing the motor mounts, 4-5 bar the whole time. I came home, turned it off and then about 5mins later I turned it on to jump start a friends car, it idled about 8-10min and when I got in it, I was at 1.5-2 bar. Is my car over heating? I don't think my fans work, because I have never seen them on when my engine is warmed up/hot. I don't have a working temp gauge yet, and now that summers around the corner I'm worried about overheating. Wouldn't my pressure drop if the oil is too hot?
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White 1987 Porsche 924S manual

Ozzie · Posted: Mon Apr 13, 2009 7:28 am Post subject:

1.5 bar at hot idle is normal.
To check your fans, join the wires on the temp switch on the radiator.
They should come on slow and if you turn on the ign, fast.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance