Mechanics

QUESTIONS FOR ALL OTHER CARS OIL PRESSURE DROPPING

2005 All Other Makes All Other Models

Engine Performance problem
2005 Questions for all other cars 6 cyl Two Wheel Drive Manual 50000 miles

We have a 2005 Freightliner M2 Class. Diesel. When going 70 mph (after already warmed up), is it normal for the pressure to drop below 50 psi? It is also causing the truck (we believe) to drop speed and not be able to get back up past 65-70.
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Eandmpools
March 12, 2010.




Hi eandmpools,

The operating pressure should be at about 45 psi for most diesel engines.

I believe the diesel filter is the more likely cause of lack of power at high speeds. Clogging of the diesel filter would restrict the amount of fuel getting to the fuel pump.

KHLow2008
Mar 15, 2010.


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