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Thread: Help the kraut with LS3 and E38

  1. #1
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    Help the kraut with LS3 and E38

    Hello from Germany!

    I got a LS3 crate engine with a E67 ECM (from GM Performance) and all work fine. Now I'm trying to get a LS3 with a E38 running. The parts are from GM, only the MAF sensor ist GM Performance.
    The Idle is very poor, including backfire and an idle RPM between 250 and 1250. So I disconected the MAF and the Engine was runnig better.
    My first step was to read out the MAF MAP and IAT tables from the E67 and write it to the E38. As a result, the idle was a little bit better but not satisfyfing.
    The IAT was 10°C to high. Is the Map value relativ or absolut? should it show 0 or 1013hpa when the engine isn't runnig?
    I'am wondereing also about the TPS. The values are between 25% and 88% on both ECM. is that correct?

    I hope i'm on the right way, and find someone who can help me to solve this problem. And sorry for my english

  2. #2
    Senior Tuner
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    The TPS not showing you 100% is due to the incorrect PID for drive by wire. http://www.hptuners.com/forum/showpo...69&postcount=2

    It sounds like you need to make sure the MAF axes are the same before you copy/paste the data, and if not, interpolate it as best you can until you can tune it.
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  3. #3
    Senior Tuner DSteck's Avatar
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    Post the file from both PCMs. Also post a log.

    Your English is fine. It's better than most Americans.

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  4. #4
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    ok, the TPS signal should be correct. As i changed the MAF table, i changed also the labels, so that should be the same (in my opinion).
    I can post the files on Monday, and a log on wednesday or thursday, when i am for the next time in the company.

    He are some more facts about the components:
    The MAP Sensor is from GM Performance # 15865791
    The Harness an ECM is from Howell Engine Development, i suggest it was GM, but the purchasing told me, that is was from Howell
    ECM GM# 19210738
    Throttle control customer P# 10379038

    are the MAP, MAF and IAT tables the keys to solve this problem, or are there more possible mistakes?

  5. #5
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    Here are the files from both ECM.
    The C3_edit file is the one where I tried to tune the MAP MAF and IAT tables.

  6. #6
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    And here is the logfile

  7. #7
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    Any ideas for a proper engine running?

  8. #8
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    No one who can help?

  9. #9
    Senior Tuner DSteck's Avatar
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    Sorry, been super busy. If I get free time tonight, I'll review everything posted.

    DSX Tuning - Authorized HP Tuners Dealer
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    Just say no to bull s***.
    IF YOU WANT HELP, POST A FILE!