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Thread: Bad MEMCAL?? Can I substitute an L27 MEMCAL on an L67 Application

  1. #1
    Fuel Injected! darbysan's Avatar
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    Bad MEMCAL?? Can I substitute an L27 MEMCAL on an L67 Application

    I've been tracking issues with a 16183247 ECM ( '95 OBD1). It was running fine, and then suddenly won't work properly. I've tried everything, and am down to one last potential variable- the stock MEMCAL. I'm using a MEMCAL from the Donor car ( '95 Riviera L67), with a prom burned with a Burn1, and a Moates Adapter.

    My Question: Would a bad MEMCAL cause issues with Temp readings( ECT, IAT, TRANS), Voltage Readings,Fans not running, etc? Can an L67 MEMCAL be replaced with and L27 ( NA) MEMCAL, or does the Memcal have to match the prom and engine. Hard to find L67 PCM's in the local junk yards.

    Thanks
    '85 SS El Camino, Gm Crate 350 L31, Vortec heads,TPI.
    https://sites.google.com/site/darbyselky/home

  2. #2
    Super Moderator dave w's Avatar
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    I can't say yes to your question.

    What I can say is a Memcals can cause some unusual behavior. I recently helped with an engine swap, simple enough. out goes the 350 and in goes the 383 (pcm 16197427 / 1995 TBI). So for some UNKNOWN reason, the original 5.7 memcal wont start the new 383 engine. Tried 3 different 350 Memcals from the same part # 16197427 pcm, engine still won't start. In a "What in the World is going on", I installed a memcal from a 454 same part number 16197427 pcm, engine runs fine.

    I would try the L27 Memcal. Of the many functions the Memcal does, the L27 and L67 share the cylinder select ( 4cyl / 6cyl / 8cyl) voltage. Of the many functions the Memcal does, the Limp Home mode and Knock Sensor Filter would likely be different. I would only install the L27 Memcal long enough to figure out if the L67 Memcal is the problem, maybe a couple minutes of engine run time?

    dave w
    Last edited by dave w; 07-01-2016 at 07:20 PM.

  3. #3
    Fuel Injected! darbysan's Avatar
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    Thanks Dave- Guess I'll play around some more.
    '85 SS El Camino, Gm Crate 350 L31, Vortec heads,TPI.
    https://sites.google.com/site/darbyselky/home

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    I just bought a 16183247 bhdr 4740 on memcal. Out of a 94-95 Olds something s/c 3800, picked it up looking for 7730's. Cant garrentee its good but let me know if i can help..was reading ur post when searching the ecm number but thought it was a years old post??.....

  5. #5
    Fuel Injected! darbysan's Avatar
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    That MEMCAL could be a possibility. I sent you a PM
    '85 SS El Camino, Gm Crate 350 L31, Vortec heads,TPI.
    https://sites.google.com/site/darbyselky/home

  6. #6
    Fuel Injected! darbysan's Avatar
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    Just closing this thread out ( I hate "dangling" threads). Could not discover the problem, but got lucky and was able to return the engine for refund. Now starting an install of a newer 3800SC series II that is OBDII. Hopefully, better results.

    Thanks
    '85 SS El Camino, Gm Crate 350 L31, Vortec heads,TPI.
    https://sites.google.com/site/darbyselky/home

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