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Thread: Flashing cel

  1. #1
    Registered Member NaturalFlavored's Avatar

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    Flashing cel

    So now my car just had a check engine light come on and it drives like shit and sounds like shit.
    I checked and I don't see any broken lines.

  2. #2
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    That's engine misfire.

    It's the only code that flashes the CEL. Then your car goes into limp mode.

    If you still have a pre-cat you can wreck it in seconds.
    Headers don't have a pre-cat and need the non-fouler mod.
    The Diagram Dude

  3. #3
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    A code reader will tell you whether you have a random mis-fire(P0300) or cylinder specific (P0301- P0304).

    Many people here have found that the misfire was caused by coils.

    If I were you, I'd start with a new set of ignition coils. They are notoriuos for giving us grief.
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  4. #4
    Registered Member STudMUffin1177's Avatar

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    Only time my pro5 threw a code was a random misfire, new coil packs and cleared the code. Been fine since, id also check out your plug wires. The girlfriends kia optima ruined the plugs and wires when the coils went out

  5. #5
    Registered Member NaturalFlavored's Avatar

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    I did the Mazda 626 swap so I'll check those. I bought everything new. It went into limp mode when I was on the freeway.
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  6. #6
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    If you've got a header and no pre-cat then it's not an emergency and you've got some time to figure it out.

    If your CEL is now on all the time (no longer flashing) it means that limp mode is working and has stopped the mis-fire but you'll need to fix it to get out of limp mode.
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  7. #7
    Registered Member NaturalFlavored's Avatar

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    Cylinder three misfire. The plugs wires and coil are all new from February. So what should I look for?
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  8. #8
    The Diagram Dude pcb's Avatar

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    I'd pull that plug and take a look at it.

    Maybe run the car in the dark and look for sparks around the plugs wires and coils.
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  9. #9
    Registered Member STudMUffin1177's Avatar

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    Plug wire might've just gotten knocked loose

  10. #10
    Registered Member NaturalFlavored's Avatar

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    Spark plug smelt like gas and was black.
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  11. #11
    The Diagram Dude pcb's Avatar

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    Sounds like it's not firing.
    I'm guessing bad coil ??

    Do you have 4 coils now or still two ?

    Check the plug wire for cracks.

    You can mist some water around the wire, coil and plug and check for sparks.

    Inspect the sparkplug boot for signs of sparking.

    It could also be a partially clogged injector.
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  12. #12
    Registered Member NaturalFlavored's Avatar

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    I switched plugs and wires around and still cylinder 3
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  13. #13
    The Diagram Dude pcb's Avatar

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    So you cleared the code first and it came back again as cylinder 3 ??

    That's sounding like injector.

    Try swapping coils too, just to help make sure.

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  14. #14
    The Diagram Dude pcb's Avatar

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  15. #15
    Registered Member NaturalFlavored's Avatar

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    Ok I'll try some more tomorrow before I buy any parts. I have the coil swap so I'm going to need more time.
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