Forge rebuild after blown engine - 1 single spark when cranking

Discussion in 'Mazdaspeed 3 Troubleshooting' started by muppy, Sep 13, 2020 at 9:38 AM.

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  1. muppy

    muppy Greenie N00B Member

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    So I've recently had my MK1 3 rebuilt and forged after ZZB flat foot shifting
    We're having issues getting it to fire after everything has been put back into the chassis

    What issue we're currently having is that the engine cranks, but only produces 1 spark across the cylinders and that's all

    Everything is grounded, all sensors have been changed and the timing is correct, fuel pressure and anything we can think of has been checked over

    We changed the loom, coil packs and even ecu!

    I would massively appreciate anybody who understands or who has had the same issue rectified to shed some light

    Thanks in advance!
     
  2. Raider

    Raider Administraider Administrator Platinum Member

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    1 spark basically in firing order 1 time, then nothing?
     
    Raider, via a mobile device, Sep 13, 2020 at 12:45 PM
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  3. muppy

    muppy Greenie N00B Member

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    exactly
     
  4. Raider

    Raider Administraider Administrator Platinum Member

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    Do a data log and see if pops up something. Any CEL codes?
     
    Raider, via a mobile device, Sep 13, 2020 at 7:29 PM
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  5. muppy

    muppy Greenie N00B Member

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    Getting a fuel pressure regulator code (P0089) when scanning with obd alongside an ABS code but it seems like it's just giving us random codes tbh

    Will try to get a log while cranking
     
  6. The_big_dill

    The_big_dill Greenie Member

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    When you changed the ECU, did you get it re-flashed for your vehicle or just plug it in?

    When you checked fuel pressure what did you see?

    If the spark plugs are consistently firing in order and only 1 time after every ignition cycle, then that sounds like an ECU failsafe.

    Why do you think the ECU is giving you random codes? This is normally the best source of information for figuring out your problem.
     
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  7. muppy

    muppy Greenie N00B Member

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    Changed the ECU along with clocks, ignition barrel and key from a donor car

    And I feel like they're random mainly because we have checked over any codes it's given us and all seems fine
     
  8. The_big_dill

    The_big_dill Greenie Member

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    My recommendation:

    Revert to the original ECU, barrel and key.
    Gather data from your car: codes, fuel pressure etc.
    Do some research or post your findings here.

    We will support you with knowledge of common problem areas - the ECU is rarely a problem.

    There is the possibility that codes could be misleading, but unless you have evidence to show why the ECU is wrong, then I would focus on what the code is hinting at. You can then use the service manual or ask for help, but we need more information.

    Here is what the manual says about P0089: "If the fuel pressure average value measured by the PCM exceeds the specification when the camshaft is rotating at a specified rate, the PCM determines that there is a fuel pressure regulator performance problem."

    The diagnostic procedures tell you to check the HPFP connector and spill valve. These can be better diagnosed with fuel pressure behavior.

    The ECU may be disabling your ignition to protect the engine since it found a problem with the fuel pressure - This is what I meant by a "Failsafe".
     
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