55.2-59 5.3L LS won't fire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10-09-2022, 02:45 PM

mr48chev

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Join Date: Jul 2007

Location: Toppenish, WA

Posts: 15,375

Re: 5.3L LS won't fire

Quote:

Originally Posted by mongocanfly

Beautiful truck..does sound like you need to start with the grounds..
I'm not familiar with the Holley setup, but you should have a 12v constant feed,a switch on 12v feed to the ecm, and the grounds..who flashed the ecm

Researching the Ultimate LS setup last night it is a stand alone with it's own ECM and doesn't need the oem ECM. This is probably the unit he has. https://fitechefi.com/product/ultima...3-port-intake/

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