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Thread: VTCS troubles

  1. #1
    Registered Member

    MX5 NA '94, Mazda 2 '08

    Join Date
    Dec 2017

    Question VTCS troubles

    My girlfriend owns a 2008 Mazda 2 (110k) and recently developed knocking sound when the engine is cold. In my small amount of experience, it sounded like bearing or piston slop. Upon further thought and testing I actually found it to be the VTCS butterflies. I found this by removing the plug to the control motor and the issue went away. Also, the issue only existed with the blue "cold engine" light on, as soon as it turned off the noise disappeared.

    My question is: Should I take the manifold off and inspect the flaps, or is it just the bushings on the control rod that are rattling and not a big deal. I've seen that some engines have screw on flaps and some are slip on. As i do not know which on the mazda 2 has, i would hate for it to be a screw on flap and have it come off in the engine!

    Many thanks for any help or information :)

  2. #2
    Mazda Addicted AN7's Avatar
    Donated: $15

    Mazda2 1.5T Sport

    Join Date
    Feb 2010
    They are a slip on, only bushings, no screws or anything.
    That's weird tho, I've never heard any rattling from those butterflies from mz2s that have 100k miles or so.

  3. #3
    Registered Member

    MX5 NA '94, Mazda 2 '08

    Join Date
    Dec 2017
    Thanks so much for you information! It's definitely the butterfly assembly that's rattling. Yeah I agree with you tho, shouldn't happen at 100k. Unfortunately the car has done a lot of short trips in its early life; it's done a lot of cold starts, so that would change the wear rate.

    Cheers, I'll carefully pop the manifold off and check for play in the butterflies.

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