Engine stutter

Discussion in 'Mazdaspeed 6 Troubleshooting' started by Youri Lamie, Jul 11, 2020.

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  1. Youri Lamie

    Youri Lamie Greenie N00B Member

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    Hey guys first time posting.

    Recently bought a Mazda 6 MPS in the Netherlands with 180000 km with a new transmission (10000 ~ km).

    I love the car but the engine stutters and misfires if I accelerate quickly. About 3000-3600 rpm it's starts stuttering. Also the check engine light is on

    Obd2 scanner said it was a p0300 Screenshot_2020-07-11-14-59-20-11_aa9a7e9b7a713a0e77a9bb5cef99cf9b.jpg Screenshot_2020-07-11-14-58-51-96_aa9a7e9b7a713a0e77a9bb5cef99cf9b.jpg Screenshot_2020-07-11-14-58-13-61_aa9a7e9b7a713a0e77a9bb5cef99cf9b.jpg Screenshot_2020-07-11-14-40-54-62_aa9a7e9b7a713a0e77a9bb5cef99cf9b.jpg

    I reset it did an oil change and spark plugs change
    After that 2 times I got the p0300 and 2 times I got the p0304 code.

    The p0300 showed 24 misfires on the 4th cilinder and on cilinder 1,2 and 3 had about 2~3 misfires.

    So I think the coil pack for the 4th cilinder is broken. I checked the coil packs with an multimeter but they all had the same resistance.

    So i switched the coil pack with cilinder 1 and cilinder 4. Now the misfires are on cilinder 1. Is it really the coil pack or could it be something else?

    PS: the files below are the check engine light reading snapshots and the last one is the misfire counter when I changed the coil packs
     
    Youri Lamie, via a mobile device, Jul 11, 2020
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  2. jsmith

    jsmith Silver Member

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    So, you had misfires that you traced to cylinder 4. Swapped the suspect coil pack to cylinder 1 and the symptom follows the coil pack?

    Sounds like you already know what your issue is.
     
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  3. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Coilpack
     
    Easter Bunny, via a mobile device, Jul 12, 2020
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  4. Awafrican

    Awafrican Moderator Gold Member

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    No it's probably your driver's seat being in the wrong position. /S
    As others have said, yes it's your coil pack replace it and go from there.
     
    Awafrican, via a mobile device, Jul 12, 2020
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