P0300 on load

Discussion in 'Mazdaspeed 3 Troubleshooting' started by davros, Mar 27, 2023.

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  1. davros

    davros Greenie Member

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    Ok, car originally had p0301, asked tuner what he thought he suggested new injector seals, so I tore apart the front, removed the obviously destroyed oem seals, and got hurt. (Tore my bicep tendon at work it was a great time )


    Two years goes buy car has been sitting waiting for me to put it back together after my surgery and time allowed.

    Car is now back together with new overspeed seals and at load and cold start it throws a mean p0300 code now. Sputters and spits on any kind of load.

    Things I have done so far,


    Changed plugs newly gapped

    Filled gas tank there was about a 1/4 tank of two year old gas that was treated with Stable.

    Cleaned maf

    Checked every vacuum hose I could find

    Going to run a compression test tomorrow and take some logs (will post after)

    Slightly stumped.















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    Last edited: Mar 27, 2023
    davros, via a mobile device, Mar 27, 2023
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  2. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Check all of the electrical connectors and grounds
     
    Easter Bunny, via a mobile device, Mar 27, 2023
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  3. Awafrican

    Awafrican Moderator Gold Member

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    This is what I was thinking too, when I had a random code myself after doing seals it was because the injector harness wasn't seated properly on the one injector so it wasn't firing properly.
     
    Awafrican, via a mobile device, Mar 28, 2023
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  4. davros

    davros Greenie Member

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    Going to for sure, I'm also going to recheck torque on injectors just for peace of mind.

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    davros, via a mobile device, Mar 28, 2023
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  5. davros

    davros Greenie Member

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    took everything back off, checked the torque on the crows feet, fuel rail, intake etc. plugged everything in. Put everything back together. No code. But still has symptoms, stutter, shudder and sputter. Compression is good on my china tester it was 172-174 all 4 cyl.

    took some logs posted a bunch 1st is idle others are driving.


    I'm gonna pull it apart again and send the injectors out to clean them and test
     

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    Last edited: Mar 29, 2023
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