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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 12-03-2016, 10:14 PM   #1 (permalink)
st_man
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Oil pressure issue

My 6.5L turbo has some strange oil pressure behavior.
The history: It had always run about a steady 40psi on the highway for the longest time. A while back I had to change the sensor and it started running a bit higher but in idle it would drop to almost 0, so low that the check gauges light would come on.
Now in the few days I have started getting really high readings. Almost 80psi (almost pegged out) at 60 mph but it is only dropping to 10 psi in idle. Also when I shut off the engine the gauge stays at 10psi. Turn the key to engage the electrical (but not crank) and the gauge will drop to 0.
Any ideas??
Also, is there any motor flush (add to oil) I can use on this turbo diesel?

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Old 12-03-2016, 10:33 PM   #2 (permalink)
grabowski
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Check all your grounds, especially the firewall harness to passenger side intake. Did you put an AC Delco sending unit?

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Old 12-03-2016, 11:06 PM   #3 (permalink)
OkDually
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Quote:
Originally Posted by st_man View Post
My 6.5L turbo has some strange oil pressure behavior.
The history: It had always run about a steady 40psi on the highway for the longest time. A while back I had to change the sensor and it started running a bit higher but in idle it would drop to almost 0, so low that the check gauges light would come on.
Now in the few days I have started getting really high readings. Almost 80psi (almost pegged out) at 60 mph but it is only dropping to 10 psi in idle. Also when I shut off the engine the gauge stays at 10psi. Turn the key to engage the electrical (but not crank) and the gauge will drop to 0.
Any ideas??
Also, is there any motor flush (add to oil) I can use on this turbo diesel?
Welcome to the forum

As noted by grabowski, go through all of your grounds.
https://www.dieselplace.com/forum/63-...d-grounds.html

A faulty OPS can give a bad signal to the gauge as well..

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Last edited by OkDually; 12-03-2016 at 11:06 PM.
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Old 12-04-2016, 04:58 PM   #4 (permalink)
JMJNet
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If the OPS is NOT ACDelco, it will do that.

Also, check the oil filter, make sure it is not collapse especially if it is "orange" color.
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