Oil pressure gauge seems high
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So my oil pressure gauge seems pretty high. It idles warm around 40, starts cold at about 60, and before the car is totally warm can get near 80 while driving.
I thought I had some old or too thick oil in there, last change was ~4k mi and I didn't do it myself. So as of yesterday, I've got some new 5w30 (valvoline dino oil) in there, and the same thing is going on.
Is there something mechanically wrong that can cause this?
Do I just need to check the oil pressure sender and the wiring? Or maybe just the gauge could be off?
I have no complaints about how the car is running.
I thought I had some old or too thick oil in there, last change was ~4k mi and I didn't do it myself. So as of yesterday, I've got some new 5w30 (valvoline dino oil) in there, and the same thing is going on.
Is there something mechanically wrong that can cause this?
Do I just need to check the oil pressure sender and the wiring? Or maybe just the gauge could be off?
I have no complaints about how the car is running.
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Oh yeah, the car's a 2000 z28 with about 114k miles on it.
And might be unrelated: I did have to replace a pretty bad looking PCV hose. So I think it's getting some (but not a lot of) blow-by for a while now.
And one more thing I remember seeing: it does seem to bounce around a bit more than I'd expect. Kind of a low frequency (2Hz?) vibration. Not all the time, but sometimes.
And might be unrelated: I did have to replace a pretty bad looking PCV hose. So I think it's getting some (but not a lot of) blow-by for a while now.
And one more thing I remember seeing: it does seem to bounce around a bit more than I'd expect. Kind of a low frequency (2Hz?) vibration. Not all the time, but sometimes.
Last edited by smcnealy; 12-19-2008 at 09:06 AM. Reason: one more thing...
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Your car have a manual trans?
I ask because I can only get near 80 with higher rpm than the automatic will allow during normal driving.
I just installed an autometer oil pressure gauge.
The factory gauge reads higher at low rpm, and lower at high rpm.
My point I guess is all gauges read different, especially factory gauges.
PCV will not have any effect on oil pressure.
I ask because I can only get near 80 with higher rpm than the automatic will allow during normal driving.
I just installed an autometer oil pressure gauge.
The factory gauge reads higher at low rpm, and lower at high rpm.
My point I guess is all gauges read different, especially factory gauges.
PCV will not have any effect on oil pressure.
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It's an auto. Has the factory gauge. And it doesn't really need a lot of RPMs to read high.
I'm thinking more and more that the pressure can't really be that high and that it's a bad pressure sender. Apparently it's behind the intake manifold? Maybe I bumped it and messed it up since you can't see what you're doing back there. Looks like a pain to replace...
I guess I'll be looking into the sensor as a problem. I was really hoping people would say, "oh, everything's fine."
I'm thinking more and more that the pressure can't really be that high and that it's a bad pressure sender. Apparently it's behind the intake manifold? Maybe I bumped it and messed it up since you can't see what you're doing back there. Looks like a pain to replace...
I guess I'll be looking into the sensor as a problem. I was really hoping people would say, "oh, everything's fine."
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Mine always reads high but it reads almost 20 with the engine off and key on so I just subtract 20 from the pressure it says and I still have good pressure so I'm not too worried about it. I broke my sending unit when changing the intake and when I replaced the broken sensor with a new one it started reading high then.
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mine read 65 on cold start 40-45 hot idle and pre-warm up driving was around 80-85. nothing to worry about. i melted three pistons due to a nitrous issue and my bearings/crank/rods all look to be in very good condition. 99 30th M6 110k.