Wild misfire/shudder around 2.4k RPMS

Discussion in 'Mazdaspeed 6 Troubleshooting' started by pzntRS6, May 29, 2022.

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  1. pzntRS6

    pzntRS6 Silver Member

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    Having a very intermittent problem with my speed 6 shuddering and misfiring like crazy while accelerating at low rpms between 2-3k. It’s super random so very hard to get a log of it but the one log I was able to get I noticed that the fuel rail pressure dropped below 100 psi for about 20 seconds before it started misfiring. Figure it’s something to do with the HPFP, where should I start? It’ll drive fine for days at a time, some days it might be just a blip, some days it just goes crazy, super weird how intermittent the issue is to me
     
    pzntRS6, via an iPhone, May 29, 2022
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  2. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Do you have a way to take logs?

    Test your pressure relief valve.
     
    Easter Bunny, via a mobile device, May 29, 2022
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