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Thread: Need a little help with tuning on my 1949 3100

  1. 01-07-2022 #1
    Coffer81
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    Need a little help with tuning on my 1949 3100

    Hey guys, so I am having a bit of trouble tuning the 5.3 that was swapped into my 49 chevy 3100. The truck will start fine and idle but as soon as I try to drive it it will start cutting out. I had my neighbor do the tune on it but something is just not right. The engine is a 5.3 out of a 2000 yukon and I used a PSI harness. I am running a 700r4 transmission.

    I have attached the tune and the log if someone has time to look it over to see what I am missing I would greatly appreciate it.

    thank you
    49.3100.1.7.hpl1.7.hpt
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  2. 01-07-2022 #2
    5FDP
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    What is your fuel pressure?

    You need to disabled the transmission abuse mode and also the engine side abuse mode. Set the engine side to 7,000rpm and 0mph. Then go in and turn off all trouble codes for things that aren't there. Like rear o2 sensors, EVAP, transmission related DTC's all need to be set to no error reported.
    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.
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