oil pressure indicator

[georgeingamells]

Hi all,

Just purshased a 997 c2s , covered 46k, when starting from cold pressure reads 5 and reduces to approx 2.5 when at full temp, what worrys me is the manual says it should read approx 3.5 bar @ 5000rpm but accually goes upto 5 bars way before, around 4000rpm, is this common?

Thanks George

[Bellmore996911]

Hi all,

Just purshased a 997 c2s , covered 46k, when starting from cold pressure reads 5 and reduces to approx 2.5 when at full temp, what worrys me is the manual says it should read approx 3.5 bar @ 5000rpm but accually goes upto 5 bars way before, around 4000rpm, is this common?

Thanks George

I have an 03 911 Carrera with 42k miles on it.

Mine is the same way - I thought it had high blood (oil) pressure. It starts out at 5 from a cold start and then it gradually goes down. No way does it go down to 3.5 at 5000 rpm.

Also -- what does the oil pressure gauge read when you turn the key WITHOUT starting the engine (*like you would do when you want to check the oil from the dash computer).

I have pressure of "3" without the car even running -- is this normal?

[whall]

"I have pressure of "3" without the car even running -- is this normal?"

It is not normal. With the ignition off, the oil pressure gauge needle should indicate slightly below "0". With the ignition switch on - and the engine static - the oil presure gauge needle should read "0". With the engine running, the oil pressure gauge should indicate what ever oil pressure the oil pressure transmitter senses.

If the oil pressure gauge indicates 3 bar with the engine static, the oil pressure transmitter is probably bad. BTW, the "important" oil pressure read by the car is the oil pressure sensed by the idiot light (it's curcuit is separate from the oil pressure gauge circuitry and has a different terminal on the oil presure transmitter). If the idiot light illuminates, among other things, a record is entered into the DME memory. If you carefully read the owner's manual, you'll see much different responses indicated for the idiot light illuminating and an indicated low oil pressure. (Idiot light illuminated = stop immediately; oil pressure reading low = visit dealer to rectify the problem- or words to that effect.)

I don't know what oil pressure causes the idiot light to illuminate. And as far as 3.5 bar @ 5,000 RPM goes, I would think that should be interpreted as "at least" 3.5 bar @ 5,000 RPM (3.5 bar = 51.5 PSI).

Bill

Edited February 3, 2010 by whall