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Old 08-26-2019, 06:30 AM   #1
Mini-Skoolie
 
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Electrical or mechanical

Well I just had my oil pressure sensor replaced. Same problem, no change. The oil pressure gauge reads about 95-98 psi. The repair shop did not try to figure out the problem. One mechanic made a silly comment that high pressure is always good. Anyway, what could be the problem? I'm sure a manual pressure gauge would be the best way to know what the true pressure is but why is the new pressure sensor reading too high too? This is a 1999 5.9, 24 valve.
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Old 08-26-2019, 06:44 AM   #2
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Old 08-26-2019, 07:39 AM   #3
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Are you sure the new sensor is reading that way? Are you sure your oil pressure isn't that high? Are you sure the gauge isn't what is faulty?

How did you talk to the shop when you dropped it off?

If you asked them to diagnose and fix the high oil pressure reading, then this is still on them, and whatever tech that did the repair didn't do his job.

If you told them to replace the oil pressure sender, then that's what they did and it not working is on you.
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Old 08-26-2019, 10:22 AM   #4
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high pressure

to diagnose oil pressure problem the first step would be to install mechanical test gage. start engine cold, run engine to bring oil up to operating temperature, normally around 200 degrees Fahrenheit, some times a little higher. oil pressure at idle, 1500 rpm or so and maybe 2500 rpm are then recorded. Based on information at this point, judgement is made. It is possible there is a stuck oil pressure relief valve. It is possible the oil is too thick. It is possible the there is a problem with the wires between the gage and the sending unit, it is possible the gauge is faulty. it is possible the sending unit is faulty. It is possible there is an obstruction in an oil gallery. It is possible there is more than one problem.

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Old 08-26-2019, 10:50 AM   #5
Mini-Skoolie
 
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The gauge reading is about the same hot or cold. When I first noticed it about 2 years ago it would read about 85-90 cold then when hot about 95. Now it reads about 95 cold and about 98 hot.

I guess it was my fault by not making it clear with the repair shop to fix the problem. I had ordered the sensor and told him what the symptoms were. And he just installed the switch.

One of the mechanics said that perhaps the computer needs to be reflashed. Perhaps they just saw me coming with that clueless look on my face.

It could be a bad new sensor but as was stated it would need to be tested. Can anyone tell me if the oil pump will actually produce that amount of oil pressure?
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Old 08-26-2019, 11:22 AM   #6
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Quote:
Originally Posted by budbud7 View Post
I guess it was my fault by not making it clear with the repair shop to fix the problem. I had ordered the sensor and told him what the symptoms were. And he just installed the switch.
Yeah, if you provided the part and told them to change it, I doubt they did any troubleshooting to verify if that was actually the problem.

Quote:
Originally Posted by budbud7 View Post
One of the mechanics said that perhaps the computer needs to be reflashed. Perhaps they just saw me coming with that clueless look on my face.
The computer might need to be reflashed or updated, but I doubt that is the cause or solution to your problem.

Quote:
Originally Posted by budbud7 View Post
It could be a bad new sensor but as was stated it would need to be tested. Can anyone tell me if the oil pump will actually produce that amount of oil pressure?
There is a lot that it could be. You could have a mechanical failure causing the pressure relief to stick closed. That would peg a gauge quickly, but it's unlikely that's what is happening. Every time that I've seen that happen, they blew the seal out on the oil filter as well.

First thing to do is to check with a known good gauge to see what the oil pressure actually is vs what the dash gauge is reporting. If those two numbers are off, then you check the sending unit for the correct signal being sent. If all of that is okay, then you check for the same signal at the gauge connection. If that checks out, and the gauge has the proper power and ground supplied to it, then the gauge is at fault.
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