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    techtimdavis's Avatar
    techtimdavis Posts: 103, Reputation: 1
    Junior Member
     
    #1

    Feb 22, 2019, 05:32 AM
    Engine surges at 45-55 mph
    2002 pontiac grand am 3.4l v6 surges at 45-55 mph, not every trip. Checked for dtcs only dtcs are o2 sensor related. What would be the most probable cause of this surging at this speed range?
    kitch428's Avatar
    kitch428 Posts: 1,428, Reputation: 152
    Ultra Member
     
    #2

    Feb 24, 2019, 11:53 AM
    If the car has egr, I'd be looking into that. Could be leaning out at that speed.

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