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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Low Boost

Old Jun 21, 2008 | 08:05 PM
  #1  
'02STROKER's Avatar
'02STROKER
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From: Utah
Low Boost

I was pulling my trailer yesterday (15,000#), up a long grade. The first half of the grade I was maintaining 60-65 mph at 3/4 throttle, it was 90 degrees outside, and the fans were running pretty hard, boost was about 35-38 lbs. The road then flattens out for about 2 miles, & then another long climb, on the second climb the truck would only boost 20-25 lbs. @ 3500 Rpm. I backed out of the throttle & got back into it still same boost numbers. All guages read normal no warning lights on. Do these trucks defuel if egt's get too high? All my boots are tight & truck seems to be running fine. Any info is appreciated.
 
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Old Jun 21, 2008 | 09:00 PM
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SouthTexasDiesel
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Possible regen cycle. Boost pressures tend to fluctuate when the truck is in regen.
 
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Old Jun 22, 2008 | 12:22 AM
  #3  
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dt75flh
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my boost will drop to around 21-28 when regen under load and going up hill at freeway speeds
 
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Old Jun 22, 2008 | 06:00 PM
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'02STROKER's Avatar
'02STROKER
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thanks guys, I will watch it next time I tow.
 
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Old Jun 24, 2008 | 05:10 PM
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SANDDEMON08
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From: Henderson, NV
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Yep sounds like an active regen, and yes the PCM will defuel when the exhaust temps go to 1400 degrees.
 
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