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ecu question

This is a discussion on ecu question within the General Help forums, part of the LSx Technical Help Section category; im going to add this here also for the traffic Hi all first post here and looking for a answer ...

  1. #1
    Junior Member
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    black
    1969 nova

    ecu question

    im going to add this here also for the traffic

    Hi all first post here and looking for a answer to a question
    Im in the middle of building a 5.3 turbo 1969 nova and got a deal on a turbo and computer set from a friend
    he said the ecu is programmed for a 54 tooth wheel. looking at the computer and harness for install i noticed that the ecu plugs are color coded for a 24 tooth wheel
    I currently have a 24 tooth motor in my nova now so I swapped the ecu out and it started and idled
    although not happy it hunted for idle speed a little and when i cracked the throttle a little it popped in the intake a bit, im figuring its because of stock injectors and no turbo at the moment

    it runs just fine with my ecu in it holds idle no problem and dosent pop at all
    im trying to ID if this is for a 24 tooth or a 54 tooth motor
    thanks
    mike

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Only way to know for sure is have a tuner look at the software on HPTuners or EFI Live.

  3. #3
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    Black & Blue
    '02 WS.6 / '07 Suburban

    What year and model vehicle was the 5.3 sourced from? I am thinking that anything 2004 on up is probably 58x.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    True however 04 is the yr of the change over. Safer to say 05 and up are 58x. With 04 you need to verify. IIRC Black crank sensor = 24x, gray = 58x

  5. #5
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    Black & Blue
    '02 WS.6 / '07 Suburban

    ^^ Good point.

    The aftermarket now sells a 24x to 58x converter box.

  6. #6
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    black
    1969 nova

    The 5.3 came from a 2006 1500 suburban
    It turns out it is a 24 tooth wheel on it so I am good with it

  7. #7
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    Black & Blue
    '02 WS.6 / '07 Suburban

    By chance, is it a DOD engine?

  8. #8
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    Not that I know of
    But I will find out next week

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