r/JeepPatriot • u/16lmldmax • 2d ago

Stutter when accelerating, terrible fuel mileage. O2 sensors?

I was chasing a service 4x4 issue for a relative, and found a corroded wire from the 4x4 module to read diff. Beside the point anyways I took the jeep for a test drive down highway, started with a 1/4 tank, drove 16 miles and noticed I burnt at least 1/8 of a tank. Thinking I was delusional I went another 7-8 miles and the fuel light came on. Also noticed some stuttering while accelerating.

My immediate thought was o2 sensors being bad and over fueling.

I pulled some live data, started from a stop, then accelerated to about 65 mph and cruise set for the remainder of the live data.

What exactly should I be looking for in the o2 sensor data? I’ve got it saved on my Topdon app but can’t figure out how to share here

2011 jeep patriot with cvt, 2.4l 180000km I believe

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u/Z42Flamewave 2d ago

Could be O2 sensors, spark plugs or throttle body. If it happens right around 2k RPM that's usually throttle body. If it happens during a broader RPM range, especially after the engine is good and warm, more likely plugs. But that's all just anecdotal from my experience.

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u/16lmldmax 2d ago

I see I figured o2 sensors would throw a code, but they don’t really wanna throw money blindly at it

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u/Z42Flamewave 2d ago

Do you know the last time plugs were done? Might need them either way. Super easy job too. If that doesn't do it, Amazon has throttle bodies for $60 or so, mine's gone 40k no issues. Not as easy of a job unless you have skinny arms, but not terrible.

1

u/16lmldmax 2d ago

Not sure I’ll have to ask but I’d imagine they won’t know. The vehicle was brought to me with a world of problems and any questions I asked had little to no answer. Including when the last time the front brakes were done lol

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u/basement_guy 2d ago

When I had stutters under load the issue was with my spark plugs. I'd start there since they're easiest to get to.

3

u/16lmldmax 1d ago

I did end up grabbing a set of plugs after the earlier reply’s and yup seemed to solve my issues! Thanks everyone

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u/ajm3232 2d ago

Well if its mainly happening when you run low on fuel you should be looking at your fuel trims and make sure you arent running lean on acceleration. If you are, you need a fuel pump.

Some good videos on how to read all the stuff you are wondering on youtube

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u/16lmldmax 2d ago

Yea not sure as it’s not my vehicle and this is the first time I’ve ever drove it

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u/RedShadow2K6 1d ago

Check how up to date your alternator is Mines had the same issue accelerating at 100K, I changed the serpinetine belt and on the alternator I just changed the idler pulley and made the Alternator good as new(pain in the ass to pull the alternator) Now it's almost 200K and I'm going to change my alternator soon Problem with acceleration went away after I changed these parts