Help with fuel pressure weirdness and theory

Discussion in 'Mazdaspeed 6 Troubleshooting' started by mstake6, Oct 29, 2024 at 2:03 PM.

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  1. mstake6

    mstake6 Greenie Member

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    I read that tread and I think there was no follow up. I used compressed air to check it and it sealed. After looking at it I agree with Enki that it would be super unlikely to fail.

    So I got it back together and no love. It took much cranking to start and initially idled fine with occasional pops. As it runs and warms up there's a noticable stumble or slight misfire. The pump managed to hit 1936 psi. About 15 minutes in the fuel pressure started to act up. I noticed after revving it up that pressure dropped to 60 psi for a split second. Over the next few minutes it slowly and steadily dropped until it stalled. The reading was 39 psi. KOEO, the pressure went down over a few minutes to 29 psi.
    So what? Spill valve solenoid failure? Another PRV replacement?
    It's a condition related failure that can be consistently replicated. I'm thinking it's caused temperature or pressure. I really wish I had CEL's to point at something. The complete loss of rail pressure seems to be a spill valve failure. I was surprised how long the engine will run with the relays unplugged. It makes me think that the spill valve is cutting out and the engine runs until the rail is drained. Wouldn't that cause a CEL though?
     
    Last edited by a moderator: Oct 30, 2024 at 11:40 PM
    mstake6, via a mobile device, Oct 30, 2024 at 10:53 PM
    #21
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