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Thread: Surging freeway speeds 2011 3.8l

  1. #1
    Knows a Thing or Two A.J.'s Avatar
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    Surging freeway speeds 2011 3.8l

    So lately my Jeep has developed a concerning surging/stumble at freeway speeds. Idles and runs perfectly but after awhile on longer hwy runs it will sort of stumble when maintaining speed on flat ground. It is slight but noticeable. Almost like an on and off fuel cut or something. No check engine light. No codes. Thinking TPS but I don’t really want to just throw parts at it. Anyone else had something like this?


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  2. #2
    Old Timer BaddestCross's Avatar
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    How many miles on the motor? Have you replaced the plugs, wires, and coil pack?

    Other than that, maybe crankshaft position sensor, O2 sensors, or cats on their way out. I would expect to see codes, but maybe just hasn't gotten bad enough yet.

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  3. #3
    Knows a Thing or Two A.J.'s Avatar
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    Quote Originally Posted by BaddestCross View Post
    How many miles on the motor? Have you replaced the plugs, wires, and coil pack?

    Other than that, maybe crankshaft position sensor, O2 sensors, or cats on their way out. I would expect to see codes, but maybe just hasn't gotten bad enough yet.

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    Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407
    87,000 plugs done a couple months ago. It doesn’t act like a misfire. It’s hard to explain. More like an abrupt cruise control. Like if your foot had a real bad intermittent twitch while driving. It’s subtle but noticeable. If that makes sense.


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