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Thread: M52B52, Wiring help/no spark

  1. #1
    Join Date
    Dec 2019
    Location
    Norway
    Posts
    1
    My Cars
    2003 bmw 318

    M52B52, Wiring help/no spark

    Hi

    I Been asked to look at a iceracing 318i with a newly dropped in a 1998 m52b52 in it. Since its a race car it will be ran on minimal wirering directly from the engine loom. However, this engine wire harness has a square plug for the power,starter etc, and not a big round one like i found online, so i cant really figure out exactly which wires i need. Has anyone encountered this square type plug before and have any info?

    By using the wires from the square plug, i get relays etc to turn on, i also get power to go to the coils, but no matter what i do, i get no spark. The ecu has supposedly been flashed to run without ews, but i dont know if this is true. Will the EWS cause no spark?

    Thanks in advance for help and suggestions.

  2. #2
    Join Date
    Mar 2019
    Location
    Silver Spring, Maryland
    Posts
    176
    My Cars
    1990 325i
    EWS will cause a No start situation it should cut power from main relay to IGN switch.Try throwing a spark plug on a coil and boot to body ground? Do you have fuel? I haven't seen square connectors before either maybe on 84-85 e30s maybe? To rule out a variable is this OBD1 or OBD2?
    Last edited by E30s50dude; 01-01-2020 at 12:03 PM.

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