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Thread: 3500 swap with factory ecu

  1. #1
    Potential Tuner
    Join Date
    Aug 2014
    Posts
    7

    3500 swap with factory ecu

    Hello everyone,
    Starting on my latest project which will be a 3500 from a 2008 impala with the VVT and have a question I?m hoping someone can help me with.
    I?ve been researching 3500/ lx9 swaps for info and it seems that everyone who has done this swap always uses the OBD2 3100/3400 pcm controlling it.

    So I?m just curious is there any reason not to use the factory pcm for the 3500 when swapping?

    The motor is a factory rebuilt engine that will retain the VVT and the DBW throttle body, and will be mated to a T5 transmission in an MGB. I see no reason that it won?t work with the factory pcm from the vehicle but just wanted someone with more knowledge to verify.

    Thanks in advance.

  2. #2
    Tuner
    Join Date
    Oct 2015
    Location
    Orange County, NY
    Posts
    77
    You will have to use the factory controller or an aftermarket setup. There were two generations of 3500, a VVT version that you have and an LX9 non VVT that 3400 Guys swap to. The 3500 LX9 is just a larger displacement 3400 with better flowing heads and intake. Which is why it makes sense to use the original ECU. In your case, you are swapping a VVT engine and the LA1 ECU is not able to control that