Baffling engine Oil pressure
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Baffling engine Oil pressure
1999 F150 XLT with 5.4 Non-supercharged motors.
This truck for the past few months has been baffling me. I recently replaced the transmission on it and the next day took it to work over 2 hours away. Upon driving it home the oil pressure suddenly dropped and the ECM shut the engine down. From then on for a while it would get to operating temperature then the pressure would drop after id say about 10 minutes. When we hooked it up to a live gauge it read 5-10 PSI so possibly bearing, internal at least. The baffling bit here is recent, it is running normal, even with a lighter oil in it (5W-20), I took it out the other day and it ran perfectly fine, drove to the next town over (30 minutes) and no pressure issues there and back.
I do plan to change the bearings regardless as those with the high mileage of this engine are probably due for replacing. But my question is, am I missing something? Am I completely wrong about the issue?
This truck for the past few months has been baffling me. I recently replaced the transmission on it and the next day took it to work over 2 hours away. Upon driving it home the oil pressure suddenly dropped and the ECM shut the engine down. From then on for a while it would get to operating temperature then the pressure would drop after id say about 10 minutes. When we hooked it up to a live gauge it read 5-10 PSI so possibly bearing, internal at least. The baffling bit here is recent, it is running normal, even with a lighter oil in it (5W-20), I took it out the other day and it ran perfectly fine, drove to the next town over (30 minutes) and no pressure issues there and back.
I do plan to change the bearings regardless as those with the high mileage of this engine are probably due for replacing. But my question is, am I missing something? Am I completely wrong about the issue?
Fleet Owner
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Fleet Owner
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From: Brentwood,CA
The obvious here is not the engine. The PCM won't shut the engine down with low oil pressure. Having both a low oil pressure and engine shutdown is a fault in the PCM. You need to look for com errors. Have you pulled the codes and looked at mode 6 data?
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No I haven’t
No codes pertaining to the ECM.
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