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Thread: Rough idle/stutter MPS Gen2

  1. #1
    JWMPS3 is offline New Member
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    Apr 2018
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    Default Rough idle/stutter MPS Gen2

    So over the last week I’ve noticed my MPS running a bit differently. At first i thought it may have been some bad fuel. Today i started the mazda and noticed it being more rough on idle/cold start. After reversing out my driveway it did a solid backfire (not just the normal sputter/mps tone).
    Also last week when driving in 2nd/3rd i have noticed a very slight stutter around mid throttle, very subtle but easy to notice when driven daily.
    any ideas on what this could be? MAF sensor?
    any help would be great cheers

    edit: car is stock with resonator delete
    Last edited by JWMPS3; 23-04-2018 at 03:50 PM.

  2. #2
    Nexus's Avatar
    Nexus is offline Administrator
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    Some cold start miss/pop isn't that unusual in BK, I can only think of once I got a solid backfire from mine (BK) and that was in stop start traffic. I'd suggest getting an OBD log onto it, possibly could be bad fuel - have had that once with my BL. I'd be eyeing knock retard values, fuel pressure, manifold pressure, long and short term fuel trims and AFR. That's where I'd start. Some other members might have some good suggestions for what should be logged in this case.

    If bad fuel i.e. had toluene in it or something can take a few tanks to be completely rid of it - that's what I found anyway.

    Spark plugs pop to mind as something that might need checking. A _careful_ clean of the MAF wouldn't go astray...
    "Blue Meanie" 2007 Aurora Blue MPS 3 - 18x8.5+44 SSR GTX01 - 235/40R18 Federal RS-RR - 3.5" ETS TMIC - CPE stg 2 mount - HKS/CPE BPV - 2XS inlet - 2XS short shift - 2XS turbo manifold - Hypertech tune - Leather/Aluminium handbrake - Momo shifty knob - 7" touchscreen - JDM Mazda Retractable dashtop screen assembly - PC based GPS and instrumentation - 36AH reserve battery and C-TEK isolator - TEIN Street Advanced coilovers 1" drop - Superpro bushings - 220Kw/410Nm.

    "Lipstick" 2013 Velocity Red MPS 3 - 18x7.5+48 Enkei RPF1 -225/40R18 Federal RS-RR - CPE TMIC - COBB inlet - CPE stg 2 mount - COBB Stage 1 98 octane tune - COBB shifty knob - 2XS short shift.

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