Hello. I am seeing an idle oil pressure of around 35-40 PSI that intermittently flickers down to around 5 PSI. I say "flickers," because it drops for a second or so, returns to 35-40, and repeats a few times. Then, the engine continues to idle at 35-40 PSI.
I see three scenarios:
- Gage is faulty.
- Sensor system is faulty. (Loose wire?)
- Oil pressure is actually dropping.
If anyone could bounce a few ideas around regarding that last scenario, I would be much obliged. This bus is important to me.
This is a 1999 RE Thomas with a CAT 3126 engine and Allison MD3060 tranny.