swathdiver
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??? ^^^^
Oil Pressure
- Thread starter Wolfbraid
- Start date
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??? ^^^^
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Wolfbraid
Full Access Member
see last post
I changed the oil(which includes a new filter, don't think I've ever considered changing the oil without also changing filter)
If it keeps up tomorrow, i'll pull the sensor and sensor filter tomorrow and see what it looks like...
have you guys ever considered a wire issue? the wires could be shorting out 0 Ω (or OL)= shorted to ground which will give you a reading of 0PSI on the cluster
Honestly it sounds like the wire is shorting out which why it works for a day(as the wires have been moved/adjusted.) then goes back to the issue..
A. the wire(s) has a short to ground =0Ω resistance
B. The wire has an internal break in it (OL= 0Ω resistance, aka no reading)
C. loose connection. at the terminal(s)
if you can read the Ω while it has an issue.. it can rule out an issue with the cluster it self..
vibration is an issues as well I remember with my gm car the oil pressure sensor would read 0psi when going over a very specific speed bump.. only this one speed bump would do this ..
crazy huh?
reproduce able to the very specific speed bump.. other wise i could not get it to happen any other time..
Honestly it sounds like the wire is shorting out which why it works for a day(as the wires have been moved/adjusted.) then goes back to the issue..
A. the wire(s) has a short to ground =0Ω resistance
B. The wire has an internal break in it (OL= 0Ω resistance, aka no reading)
C. loose connection. at the terminal(s)
if you can read the Ω while it has an issue.. it can rule out an issue with the cluster it self..
vibration is an issues as well I remember with my gm car the oil pressure sensor would read 0psi when going over a very specific speed bump.. only this one speed bump would do this ..
crazy huh?
reproduce able to the very specific speed bump.. other wise i could not get it to happen any other time..
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swathdiver
Full Access Member
see last post
I changed the oil(which includes a new filter, don't think I've ever considered changing the oil without also changing filter)
If it keeps up tomorrow, i'll pull the sensor and sensor filter tomorrow and see what it looks like...
I saw it, just wanted to make sure!
How'd you do that ohms thing? My Montana is acting up like this. The engine is running fine but it threw a check engine light last night. Tech-2 could not communicate with it at all. Previously, it could talk to the engine but not the body. Now nothing. Gotta be a ground or broken wire problem.
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Wolfbraid
Full Access Member
Another Update... All is well, during my commute, my pressure is reading again...
swathdiver
Full Access Member
So was the culprit the oil filter? If so, anything untoward about it?
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Wolfbraid
Full Access Member
The oil filter was a fram XG I think, I didn't cut it apart. This time i just used an ACDelco filter.
My theory:
1. I imagine that the prior owner possibly used only conventional oil, and at my first oil change I switched to Mobil 1 full synth.
The first time this happened, it happened right after I got on the gas HARD... I'm guessing that some gunk or build up broke free and blocked the
Oil Pressure Filter/screen thing.(I know it was blocked because I took it out and replaced it)
Second time it happened again (I think after I got on it hard.) Did an Oil change with Engine Flush... seemed to do the trick.
Another theory, the first owner grandps'd the truck, making built up possible.
Who knows, probably just junk floating around.
swathdiver
Full Access Member
We see and experience this all the time when switching over to synthetic from regular oil. It sometimes does more harm than good and unfortunately, there's no way to know what will happen. I mistakenly put my wife's old Montana onto synthetic last time and now it's got oil problems too as does my driveway! Dumb!
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Wolfbraid
Full Access Member
Yes, the only downfall of buying used, with a relatively unknown service history.
I wonder if switching to a blend or back to conventional is a better option.
Also wonder if a aftermarket solution to the oil pressure switch is a good option?
I don't worry about it too much, although I wish you could disable to warning buzzer, its integrated into the stereo.
I imagine I could put a resistor in the plug to fool the ecm and then run an aftermarket gauge...
kbuskill
***CAUTION*** I do my own stunts!
You could run a resistor IN PLACE OF the sensor to trick the ECM and gauge but it's not the best idea. There is a chance you might not be paying attention if/when the oil pressure really does drop to zero and you could do damage before realizing it.
Just keep in mind that the INPUT for the sensor is only 5V so don't just hook 12V up to a resistor and hook it into the OUTPUT wire of the sensor.
