Loss of acceleration power

Tiny
SAMANTHA SKYE
  • MEMBER
  • 2004 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 204,111 MILES
I put a lot of miles on this vehicle, I do lots of desert driving. I've always maintained it and checked fluid levels. I try and do as much of the work myself that I can on her, but I lack most knowledge on the mechanics regardless. That being said, I do drive it kind of on the fast side, and I know it's wear and tear. Last week I noticed a slight studder or two as I was normal street driving, during acceleration. Enough to really notice when I felt it a couple times. I just did a long drive, and while at highway speeds, it did it again more consistently. I think I was going probably 80. It feels like it's puffing air, or shuddering. Especially on incline. It did not feel powerful at all. It doesn't ever shut off on me. Nothing major. But after that. I babied it and it continued on fine. No check engine light. No stalling. Idles in park around 600, sometimes feels a bit on the frumpy side of idling. But my acceleration just isn't what it should be.
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Monday, November 22nd, 2021 AT 9:33 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Since you notice it the most when driving fast or accelerating, it could be low fuel pressure or even the need for a tune-up.

Since there are no codes, that will require us to check a few things until we find an issue. With that being said, I would first suggest checking the fuel pump pressure. If it is low due to a weak pump or plugged filter, that will be most noticeable under a load.

Here is a link that shows how the procedure is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you look at pic 1 below, I provided the manufacturer's fuel pressure specifications.

Let me know what you find. Also, let me know when the vehicle was last tuned up and if you have other questions.

Take care,

Joe

See pic below.

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Tuesday, November 23rd, 2021 AT 7:39 PM

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