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Thread: RPM Lag

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    Default RPM Lag

    hi. i have mazda 3 2008.
    after drive for 10-15 mintues the rpm get lagging. ( when the lag start i lost a little performance on car - when pushing the pedal the rpm goes to 4000 but after a sec goes to 3700 without change the pressure on gas pedal)
    video

    if i turn off the car for whilethe lag gone. but it become again after a long drive)

    - i change the engine but problem not solved.
    - no error code.
    - battery replaced
    - i cleaned the throw body + MAF
    - my mechanic said i clean the EGR too. but i'm not sure. it could be from there?

    do i need to replace the MAF or MAP sensor? ( no ODB error code )

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    Default Re: RPM Lag

    could it be from transmission?

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    Default Re: RPM Lag

    i agree ...perhaps Clutch slip... if MAP / O2 / dirty airfilter would trigger a CEL

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    Default Re: RPM Lag

    UPDATE :::
    if i don't turn on the AC then everything would be fine.

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    Default Re: RPM Lag

    someone said this could be from bad knock sensor. right?

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    Default Re: RPM Lag

    it's possible
    it's also possible there's programming faults in the ECU... a dealer can update this to the latest one.... there's always bug fixes with newer versions
    2005 Mazda3 SP23 hatchback (auto)
    2016 Mazda3 Sport GT (auto)

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    Default Re: RPM Lag

    knock sensor replaced . but no luck. i think this mess coming from the air condition, but i dont know which part.

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