Cylinder 1 and 4 Misfire

Discussion in 'Mazdaspeed 3 General Discussion' started by DarrinS, Jun 4, 2025.

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  1. DarrinS

    DarrinS Greenie N00B Member

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    Hello all, I’m running into a huge problem on my speed 3. I’m having a cylinder 1 and 4 constant misfire. It will randomly stop and run fine then go back to misfiring. Recently it has not stopped misfiring.
    What I have done:
    • Spark plugs replaced and gapped
    • MAF replaced
    • Set of fresh injectors from cwturbochargers
    • New battery
    • I switched the working coil packs from 2 and 3 and put them on 1 and 4 and they were still misfiring
    • Compression was: 1-135psi 2-130psi 3-130psi 4-125psi
    Compression test was done on cold engine. I know it's low but it should still run without a misfire right? What should I check next?
     
  2. automaticonlyspeed3

    automaticonlyspeed3 Silver Member

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    Did you end up solving it? any other engine codes thrown? do you have a log?
     
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