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LS Swap No Spark VATS?

This is a discussion on LS Swap No Spark VATS? within the LSx Retrofit and Swap forums, part of the LSx Technical Help Section category; I just put a 2006 LQ9 (Vortec 6.0) in a 1956 Chevy and I have no spark. No Codes. All ...

  1. #1
    Junior Member
    Join Date
    Jan 2020

    LS Swap No Spark VATS?

    I just put a 2006 LQ9 (Vortec 6.0) in a 1956 Chevy and I have no spark.

    No Codes. All grounds look good.

    Can the VATS prevent spark?

    I was under the impression I could fire the thing up and the VATS would shut the engine down after 3 seconds so I could at least make sure it runs before I program the computer. I have not got the VATS removed from the PCM yet.

    Thanks for any help.

  2. #2
    Junior Member
    Join Date
    Jul 2021
    Plymouth MA

    1957 Chevy bel air

    with VATS it should start for a second or 2 then shut down. do you have RPM showing when cranking it over ? you can check with a scan tool. bad crank sensor will prevent spark. Another common problem, is the wire people use to switch the ignition relay, has to remain hot while cranking.

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