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Thread: random misfire code after engine work

  1. #1
    Join Date
    Oct 2020
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    random misfire code after engine work

    hey guys,
    After modifying the engine with 8 rib belt and pulleys, a 10% od crankshaft pulley , and a smaller pulley on the supercharger, I keep getting the random misfire code. Ive not retuned with Marty yet.. soon.
    Could the larger crank pulley w/o a tune be the cause of the code?
    Ive not heard or felt a misfire.
    Thanks
    -KK
    '03 Silver Birch. Rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. Upgraded to 8 rib belt to reduce slip, July-Nov '23. Car broke during tune with Marty Feb '24. Running again May '24. Still needs tune.

  2. #2
    Join Date
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    Certain parts of the tune adapt and others don’t. It just depends on what your knock margin is and how much risk you’re willing to take. The increase in air flow is easily handled if you have the fuel system capacity. Either way get it retuned start there.


    2003 300A Black MM
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  3. #3
    Join Date
    Oct 2020
    Location
    Chandler Arizona
    Age
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    Posts
    331
    ok, retune is scheduled for sept 17 w/marty & jeff.

    what is the “risk” you are mentioning ?

    thanks for the input


    Sent from my iPhone using Tapatalk
    '03 Silver Birch. Rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. Upgraded to 8 rib belt to reduce slip, July-Nov '23. Car broke during tune with Marty Feb '24. Running again May '24. Still needs tune.

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