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Thread: Operation 258 High-Output: 4.0 head swap conversion on the 4.2L

  1. #46
    Join Date
    Jun 2007
    Location
    Mesa, AZ
    Posts
    2,806

    Re: Operation 258 High-Output: 4.0 head swap conversion on the 4.2L

    Congrats, glad to hear you got everything sorted out. It's got to feel pretty good finishing a project not too many people can do
    I'ma cookin' somethin' up!

  2. #47
    Join Date
    Oct 2010
    Location
    Your back pocket.
    Posts
    1,162

    Re: Operation 258 High-Output: 4.0 head swap conversion on the 4.2L

    FINAL UPDATE to this project!

    I just got back from officially clearing all the check engine codes on my system, including the "code 41" alternator field since the 4.2 doesn't use a 4.0 alternator! This setup is now officially California compliant since there will be no CEL illuminated on state inspection (in case someone decides to move there)

    It was simply a matter of bridging the two alternator sensor wires (Dark green, and dark green / orange stripe) together with a 1K ohm resistor (The alternator field sensor just measures the voltage across those two points)

    I will add this further up also so the wiring stuff is all together.

    bsns. Just got srs.

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