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Ls1 Silverado with two computers

This is a discussion on Ls1 Silverado with two computers within the Computer & Tuning forums, part of the LSx Technical Help Section category; Ive got a 2001 silverado that we swapped out the 4.3 v6 and put a ls1 engine out of a ...

  1. #1
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    Ls1 Silverado with two computers

    Ive got a 2001 silverado that we swapped out the 4.3 v6 and put a ls1 engine out of a 2001 trans am. The truck is running with two computers, one from the ls1 engine and one from the truck. Anyone think that is weird or not correct?

  2. #2
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    You can buy a stock GM v8 truck harness and run just one pcm.

    I don't know the pinouts exactly, but sometimes a truck will need the original pcm to run certain items, ie fuel gauge.

    Are you also running a stand alone engine harness for the LS1 and still retaining the factory harness?
    If so, I'd simplify it!

    later,
    allen

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    Quote Originally Posted by farmtruc View Post
    You can buy a stock GM v8 truck harness and run just one pcm.

    I don't know the pinouts exactly, but sometimes a truck will need the original pcm to run certain items, ie fuel gauge.

    Are you also running a stand alone engine harness for the LS1 and still retaining the factory harness?
    If so, I'd simplify it!

    later,
    allen
    I have a painless wiring harness and uses some of the factory wiring also, its all tied together.

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    2010 Camaro 2SS/M6

    couldn't you just use a V8 truck harness with that swap rather than going with a Painless harness? I'm not educated much with the truck wiring but if it's anything like the cars, it's just a harness swap as long as that chassis also came with V6 and V8 versions.

  5. #5
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    Quote Originally Posted by That Guy 2-1 View Post
    couldn't you just use a V8 truck harness with that swap rather than going with a Painless harness? I'm not educated much with the truck wiring but if it's anything like the cars, it's just a harness swap as long as that chassis also came with V6 and V8 versions.
    YES, much easier to troubleshoot and makes for a cleaner install.

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