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Thread: 03 Monte Carlo SS L67 swap

  1. #1
    Potential Tuner
    Join Date
    Jul 2020
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    03 Monte Carlo SS L67 swap

    recently swapped an L67 into my Monte carlo and need some help from someone who has done this.. have only had hptuners for a few weeks now and bought it for swaps like this, but have a whole lot to learn.. have the car running on the 03 MAF tables and the spark and fuel from a 2000 GTP, have lowered the commanded arf to 12.7 to make sure its not leaning out.. it keeps getting code p101 mass air circut range low and stubbles at the 2200 rpm range.. anyone on here with a similar swap that can send me a good compare file to get me running? or possible the stock files for an 03 Monte carlo ss
    Last edited by wreckhouse81; 07-26-2020 at 12:49 PM.

  2. #2
    Tuner in Training
    Join Date
    Sep 2016
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    Commanding 12.7 afr at wot is lean, you want like 11.5. Fix that code issue and it may run right. The tune repository will probably have a stock 03 mc file.

  3. #3
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    13,533
    Only change it to 11.5 if you have zero'd out the rpm vs time fuel adder. Otherwise you will make it extremely rich as the adder table can add -1 to -1.5 to the current commanded AFR, making it go from 11.5 down to 10.0 pretty easy.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  4. #4
    Potential Tuner
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    Jul 2020
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    ok thanks. going to give this a try