Fuel pump or filter?

[Tuckdawg]

2020 willys 3.6L engine bucks or jerks when settling into a cruising speed around 55 - 65. Jeep has 27k miles. I'm thinking something is interrupting fuel supply (fuel filter or pump?). If jeep had 80k miles I would be more likely to think pump or filter. Anybody have experience with this same issue?

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[mwilk012]

Why would you think fuel issue? Random guess?
There’s not much you can do without real diagnostic data.

 

[Beachcomber72]

As mentioned above I’d say you need better diagnosis, I’d be highly skeptical of it being a fuel issue if it’s only experienced in a certain mph range but it’s possible.
No serviceable filter per say fuel wise on the JL’s.

 

[Dan M.]

I have a 3.6 and do not have that issue. Try putting it in manual mode and hit the same speed in a lower gear so your RPMs are higher. If it still does it at the same mph probably not a fuel issue.

 

[Tuckdawg]

Thanks guys. Suspect fuel issue based on symptoms. Could be electronics possibly. Just seeing if there is any experience with similar issues. I'll try in manual and see what happens. Just started yesterday but will take it in to get checked out of problem continues. I'll follow up regardless.

 

[oldcjguy]

Try checking the spark plugs. See what they look like. I would think more ignition than fuel at low RPMs. If it were fuel I'd think it would get worse higher with more demand for fuel flow.

Put a diagnostic tool on the OBD port and check for codes. Not all codes will turn on the cel light when present. Maybe a misfire code? If you know someone with a Superchips TD3 (or similar tool), record a log of the jeep while it's bucking and review the data. You, or someone on this board should be able to see something going on in the log.

 

[mwilk012]

Probably a transmission fault.
It’s almost certainly not a fueling problem.

 

[Tuckdawg]

Took jeep out and drove at high and low speeds. Couldn't replicate the skipping or bucking. Drove majority of day, drove fine. Don't know what issue was but hope it doesn't return. Still getting it checked out soon to see what might turn up. Appreciate the feedback.

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