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2005 Questions for all other cars Oil pressure dropping

Tiny
EANDMPOOLS
  • MEMBER
  • 2005 ALL OTHER MAKES ALL OTHER MODELS
  • 6 CYL
  • 2WD
  • MANUAL
  • 50,000 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.
Friday, March 12th, 2010 AT 1:22 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
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Monday, March 15th, 2010 AT 12:28 PM

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