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Old 07-07-2013, 06:12 PM   #1
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9-3 oil pressure reliefe valve questions!

I have a question that has yet to be answered...
I am curious if the oil pressure relief valve opens at only the pressure before the spec given on WIS? Or, does it start to weep/open at a lower pressure and only fully open at WIS's spec? The reason I ask is because I too am a victim of "low" oil pressure... If it begins to open before the given spec on WIS then it would make sense to shim it with a few washers, say .0060" to raise pressure a bit throughout the rpm range... I know the Chevy guys do it, but have limited info on our cars. The car is t7, btw...
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Old 09-01-2016, 07:41 AM   #2
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Old 09-01-2016, 08:18 AM   #3
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I've heard about shimming the pressure relief valve. I have never seen an explanation as to how it works. I'm assuming that the oil pushes against the top of the piston and as pressure raises, it relieves.

So I see no reason why shimming wouldn't help to keep the pressure up.


My fiance's 9-5 aero has a low oil pressure problem when it's warm and at idle. I put maybe a 1/8" (.125")shim at the base of the spring it was all I had around at the time.

I have not had the car out yet, but I will report back as to if the light stays off or not. I do not have an oil pressure gauge on the car.
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Old 09-01-2016, 11:16 AM   #4
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I just chased-down a flickering oil lamp at idle that only happened sometimes (initially) at idle and only after more than 20 minutes of running. Long story short it was the oil pressure sensor itself.

Prior to getting to the sensor as root cause I removed/inspected the oil pan/pickup and o-rings and pressure valve looking to clean it, that all looked good though so I put it back together, still flickered, then I swapped in a brand new oil pump, still flickered, then I bought a full bearing set and dropped the oil pan again, the bearings looked okay so I ended up just putting it back together, still flickered, then I pulled the oil thermostat and tested on the stove top in some vegetable oil, and the thermostat was actually bad. Replaced the thermostat, oil lamp still flickered.

I agree with TurboJohnny, a cross check w/a real oil pressure sensor is a good first step.

At that point I was thinking about shimming, but figured the only remaining part might be the sensor itself, and it was. Anyway, I wouldn't shim anything untill all the other components are checked.
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