Chris996

"After driving rather hard and when coming to a rapid stop, my oil pressure drops below the number 1 bar and the low oil pressure light comes on. As soon as you blip the throttle, it goes back to normal. "

"The car is a 2002 C2 with 35000 miles. The oil pressure while driving appears normal between 3.5 to 5 bar. The oil level is kept about 2 bars down from the top of the electronic oil level indicator. The outside air temperature today was 100 degrees."

Having same problem...anyone know the fix?

rpm's S2

Just had identical problem. Not a fun moment when the light first came on and I shoved the clutch in and dove for the curb to shut the car down. But oil level was good and I did not hear any scary sounds so I cautiously drove it home.

I really debated having the car towed or driving it to my independent. Chose to drive and it ran fine with the gauge showing normal operation.

My shop inspected everything and replaced the oil pressure sensor. There was no fault code, but the computer did register an electronic 'event.'

ivangene

not to start an oil thread... but what were the ambient temps and what oil are you running

Chris996

Thanks, I replaced oil pressure sending unit. Both times this happen outside temp was 95++, fuel low, running very hard. After opening fuel cap symptoms went away. I replace fuel tank pressure valve and thought I fixed the problem.

Chris996

Temp 100, oil M1 0w40.

Chris996

Would 15w-40 fix the problem?

fpb111

15w-40 could help. What are the rpms when you stop, ~700 or is it lower?

fpb111

Just a thought:
See part #23 and 24 in this exploded view
http://dcauto.gotdns.com/illustratio...35#90037815109

also this thread
https://rennlist.com/forums/996-foru...-question.html

Chris996

Just drops under 1000rpms.

Chris996

Thanks, my 2000 996 had this replaced also. I thinks I have a new spring somewhere, I will give it a try...this sounds like a fix!!!!

ivangene

In 100 degree weather you might consider another oil though I am sure not all will agree.

I really dought its a major issue but watch it to make sure its not frequent

Macster

Not if the problem is a bad or misbehaving sensor.

If the engine really had an oil pressure problem moving to a heavier oil just kicks the problem down the road a while longer. The real problem is not the oil being used but the engine has increased bearing clearances (or something else internal possibly not related to bearing wear but simply wear) that ups the engine's oil budget over and above what the oil pump/oiling system can supply. And it has plenty of margin so if the engine's oil pressure is really too low...

Sincerely,

Macster.

Chris996

"Oil pump screw plug pressure relief piston" part # 24 from above.

Cann't remember if you need to drain the oil first to replace spring?

At that temp, will it make a difference? if not tracking.

100plus

Apologies to the OT but i just wanna ask, what could be some possible reasons why the needle on the oil pressure gauge does not stay steady? I can see the needle move a tiny up & down ...

Macster

If it does there's a problem and it is not the oil.

Engines vary but not much, if they're healthy. I've had my cars through hotter temps than 100F with Mobil 1 0w-40 oil and never had any oil pressure problems.

I have I"m sure mentioned the 116F air temp I drove through and 226F coolant temp and God only knows the oil temp my 02 Boxster manifested one blazing hot summer day in southern AZ. The engine had relatively fresh (Approx. 1K miles fresh) Mobil 1 0w-40 oil and suffered no signs whatsoever of any oil pressure issues.

While I have not had the Boxster in that high of heat since, it has seen 100F+ temps during the hotter months where I live and drive. So has the Turbo.

In fact the Turbo experienced 118F and even 119F for a few minutes between the 118F temp readings one summer day again in AZ but this time between Kingman and Needles CA and points east.

Even at 80mph (or off the freeway in Kingman or Needles and driving on surface streets) and with the A/C on to keep the cabin at a cool 72F the Turbo's oil pressure never showed any effects from the temps.

Had I not had the outside temp reading to let me know how hot it was outside of the car I could not have told you the temp was anywhere near that hot from the oil pressure or the Turbo's coolant gage needle.

If at 100F and reasonably fresh Mobil 1 0w-40 oil (or any other approved oil) and if the engine is not able to produce enough oil pressure to keep the oil pressure light from coming on and the oil pressure sender and in fact the entire oil pressure warning/gaging system is in good working order -- in short the low oil pressure reading is not due to something other than low oil pressure -- then the engine's actual oil pressure needs to be verified and if found to be too low the cause determined.

It might be an oil pressure relief valve spring or relief valve proper problem. It might be one of the pressure valves that routes oil to the piston oil jets and is supposed to shut off under low oil pressure conditions but instead has stuck open and the low oil pressure condition is sort of self inflicted.

Sincerely,

Macster.