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At low speed or when coming to a stop car hunts

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here At low speed or when coming to a stop car hunts

This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 1 month ago.

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  • #986956
    fred
    fred
    Participant

    1 have a 97 f150. When coming to a quick stop it idle erratically almost dying. Also does it when going slow and coming to stop. I have changed Throttle position sensor and Idle air control valve. Still does it. Also the rpm gauge acts crazy sometimes- I believe thats just a bad gauge. Was looking at fuel trim doesnt seem quite right. At 57 mph rpm 1756 stftM!-(-3.4) LTFTM1 (+30.4) STFTRM2- (-2.2) LTFTRM2- (+31.2) 02 SENSOR S11 (.715) 02 S12 (.125) 02 SENSOR S21 (.52) 02 S22 (.55)

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  • #986962
    Nightflyr *
    Richard Kirshy
    Participant

    By the looks of your LTFT’s
    Your engine is running extremely lean.
    Could be a vacuum leak, clogged injectors,weak fuel delivery.
    Suggest you first try smoking the intake and check for vacuum leak(s)if thats checks out good, next check your fuel pressure and make sure it is with in specs.

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