Recent content by The Raven

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    Adjust ODO for new tires?

    A couple of things - first, you can't "hand calculate" mileage properly unless the computer knows the right tire size. Doing it by GPS ain't gonna work because GPS is not nearly accurate enough. Furthermore - everyone is talking about tire size but no one is considering what is almost...
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    Diagnosing erratic/high oil pressure...

    I agree...that second sensor effectively cost me over $600.
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    Diagnosing erratic/high oil pressure...

    GM OEM. Same exact thing that I took out. Got them from two different dealers.
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    Diagnosing erratic/high oil pressure...

    Well it appears that it was a bad replacement sensor after all. After watching the above video I figured it might be possible that the +5v wire was shorting to the signal wire intermittently, cause that would cause the gauge to jump around and sometimes peg at 80...though it was tough to...
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    Diagnosing erratic/high oil pressure...

    Two issues with the idea of it being a gauge issue - first, the computer logged PO521 and PO523 which are both pressure sensor reading out of range codes (this is what spurred me to originally try replacing the pressure sensor) and second, both the dealer and the independent mechanic commented...
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    Diagnosing erratic/high oil pressure...

    Yeah I thought of that too, because the issue doesn't seem to happen when the truck is sitting, idling, on level ground. So i put it in the garage, let it run with the hood up, and made sure the gauge was stable, then had my son watch it while I poked and prodded the sensor harness and the...
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    Diagnosing erratic/high oil pressure...

    I got a third (second professional) opinion yesterday and it matches mine. A professional was able to get his mechanical gauge on the truck and verified my results. Oil pressure is rock solid, so there's no REAL problem here. It's only the gauge. Next i'm going to try another sender, but...
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    Diagnosing erratic/high oil pressure...

    Ok finally some progress. I put the test gauge setup on it again, and this time I routed the gauge up through the fenderwell (around the frame rail) and out under the back edge of the hood so i could see the gauge while driving. Then I went out for a nice long cruise until it got warmed up and...
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    Diagnosing erratic/high oil pressure...

    No luck. Behavior continues, even with new oil filter. I have driven the same test loop now so many times that I have noticed a few things, which I confirmed on my last loop. The behavior is noticeably worse while going downhill or braking, and during left turns. I can peg the pressure gauge...
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    Diagnosing erratic/high oil pressure...

    Ok got a mechanical gauge on it, and the mystery only deepens. Background info - The mechanical gauge setup I used uses a pass-through block that screws on in place of the oil filter, and has a port for a mechanical gauge fitting. So during testing, the oil filter was not installed...
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    Diagnosing erratic/high oil pressure...

    I spoke to the tech and writer again today, in person, to get a complete rundown of exactly what they did so I have it documented. They were unable to verify the gauge reading while driving the vehicle because they couldn't get a tee on without removing the intake. They were able to verify...
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    Diagnosing erratic/high oil pressure...

    Does it only operate along with AFM or does it work on it's own? I had AFM tuned out a couple years ago so while all the components are still there, they aren't activating.
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    Diagnosing erratic/high oil pressure...

    They didn't call out the o-ring individually, they said "there are several possibilities when it comes to the oil pump, but the pressure relief is the problem here". They also mentioned that there's a second pressure relief for the AFM system in there that they would also change out because...
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    Diagnosing erratic/high oil pressure...

    107k miles. Mobile 1 5w-30 and AC Delco pf48 filter religiously.
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    Diagnosing erratic/high oil pressure...

    Working with my dealer and I think we are headed in the right direction here but before I spend a big chunk of money i'd like to engage some more experts. This problem is a little different than most that i've read about. I've had a check engine light come on and then go off before I could get...
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