Gen 1 misfire

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Brian R, Sep 27, 2020.

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  1. Brian R

    Brian R Silver Member

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    Just bought a 2009 Speed3, it turned on check engine light on code is P0304 for misfire on cylinder 4 the car stutters at higher rpms above 3000 any idea where I should start? I’m a newbie :(
     
    Brian R, via an iPhone, Sep 27, 2020
    #1
  2. Raider

    Raider Administraider Administrator Platinum Member

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    Lots of posts here.
    1) swap plugs (not from Amazon, those are likely fakes)
    2) swap the coil pack to another cylinder see if it goes to the other cylinder. If so bad coil pack. Oem only aftermarket is trash.


    Still bad after?
    1)Compression test. And leak down. You may need a motor.
    2) take off intake manifold, pull injectors and replace the injector seals with Corksport seals as oem may be leaking.
    3) clean the valves while inside.
     
    Raider, via a mobile device, Sep 28, 2020
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  3. jsmith

    jsmith Silver Member

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    Also, try some E-85 (gallon or so on a full tank) if you have it handy. Unlikely to help if your injector seals are bad, but may help if you just get shitty gas.
     
  4. Brian R

    Brian R Silver Member

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    Sounds good guys thanks for the advice I will go this later today and hopefully it is just the spark plugs or coil packs... thank you!
     
    Brian R, via an iPhone, Sep 28, 2020
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  5. Brian R

    Brian R Silver Member

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    Hey guys I switched the spark plug to cylinder 1 and the misfire moved with the spark plug so good news! Do you guys know what the gap is for the new spark plugs? Thank you in advance.
     
    Brian R, via an iPhone, Sep 29, 2020
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  6. Orangatang

    Orangatang Gold Member

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  7. Raider

    Raider Administraider Administrator Platinum Member

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    NGK plugs,. 026 to. 028. 1 new coil pack and you should be OK.
     
    Raider, via a mobile device, Sep 30, 2020
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  8. Awafrican

    Awafrican Moderator Silver Member

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    @Brian R did you get this sorted? Raiders post above this should have done it for you hopefully. also only used OEM coil packs it'll be a bad time if you don't.
     
    Awafrican, via a mobile device, Oct 7, 2020
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  9. Brian R

    Brian R Silver Member

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    Sorry for the late updates, I replaced the spark plugs it got a little bit better but the car still feels like it stutters when building boost. Where could I get oem coil packs? Thank you.
     
    Brian R, via an iPhone, Oct 7, 2020
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  10. Raider

    Raider Administraider Administrator Platinum Member

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    Dealer is the best option for oem.
     
    Raider, via a mobile device, Oct 7, 2020
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  11. Awafrican

    Awafrican Moderator Silver Member

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    Awafrican, via a mobile device, Oct 7, 2020
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  12. Brian R

    Brian R Silver Member

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    Thank you for the link I called dealership and they quoted me 105 a piece I’ll order it from that website and keep you guys updated!

    Another quick note, when I put the spark plugs in the guy at autozone told me gap was .36 but someone mentioned .28 would this cause the misfire to happen just less severely?
     
    Last edited by a moderator: Oct 7, 2020
    Brian R, via an iPhone, Oct 7, 2020
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  13. Awafrican

    Awafrican Moderator Silver Member

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    Gap size: 0.026" - 0.032"| Preferred gap is between 0.026" - 0.028"

    .36 is huge! Shouldn't be more than .032" .036" is probably the OEM spec but through trial and tuner .026"to .028" has become the go to gap for the speeds so definitely gap your plugs in that range.
     
    Awafrican, via a mobile device, Oct 7, 2020
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  14. Brian R

    Brian R Silver Member

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    I changed the plugs gapped them to the right gap and switched all 4 coil packs, the problem went away a little bit but there is still hesitation/misfire when accelerating slowly.

    I did a compression test all cylinders read between 145-150 .
     
    Last edited by a moderator: Oct 10, 2020
    Brian R, via an iPhone, Oct 10, 2020
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  15. Tyler Young

    Tyler Young The road to hell is paved with tread tracks Greenie Member

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    since you replaced the coils and plugs, is it still throwing codes?
     
  16. Brian R

    Brian R Silver Member

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    No more codes but it’s still misfiring I am lost and don’t know where to go from here I will probably end up taking it to a shop this week
     
    Brian R, via an iPhone, Oct 11, 2020
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  17. Tyler Young

    Tyler Young The road to hell is paved with tread tracks Greenie Member

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    Maybe it's related to your APP. Might be worth looking into. Do you have anything that could monitor koeo and slowly depress the accelerator pedal to check for inconsistencies?
     
    Tyler Young, via a mobile device, Oct 12, 2020
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  18. Brian R

    Brian R Silver Member

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    Finally got the mess sorted out, it was a fuel injector that was leaking took it in to the shop and they figured it all out.
     
    Brian R, via an iPhone, Oct 17, 2020
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  19. L337TurboZ

    L337TurboZ Silver Member

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    At least it was something fairly simple and not an internal engine issue causing a miss. Glad you got it worked out.
     
    L337TurboZ, via a mobile device, Oct 17, 2020
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  20. Awafrican

    Awafrican Moderator Silver Member

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    So the first response in the thread by raider that said if after coil packs it continued replace injector seals was spot on ;)

    Glad it's fixed
     
    Awafrican, via a mobile device, Oct 17, 2020
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