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Low power when driving up a long hill

Tiny
TREADY66
  • MEMBER
  • 2005 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
My truck has a new engine with about 12,000 miles on it. About 8 months ago, I noticed It had no power when traveling uphill. Giving it a lot of throttle from a stop seems fine mostly (except it seems to take too long to shift) but going up a long incline it won’t go over 70 MPH and 4,000 rpm's.

Recent things done to it are:
New heads.
New cooling system including electric fan and water pump.
New coil packs.

There is no check engine light. This problem seems like it has gotten a bit worse over time. I just got back inside from cleaning the MAF sensor but haven’t had a chance to test it yet.

What else could it be? The fuel filter maybe?
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Sunday, December 8th, 2019 AT 10:25 PM

1 Reply

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
I would start by verifying the proper fuel pressure under a load. The best way to do this is with a fuel gauge attached to the windshield with tape and road testing it under the same conditions that you feel the loss of power. The pressure should be between 28-45 psi as per specs, but anything in the 20's in my opinion is too low and is usually caused by a weak fuel pump, especially if it's the original one that the truck came with. We can go from there with other tests but this is where I would start.
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Monday, June 28th, 2021 AT 12:43 PM

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