55.2-59 5.3L LS won't fire

[mr48chev]

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/

[87Lowrider]

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 ?

Thanks! Pretty excited to get it done. Sadly, I'm currently at the mercy of the body shop finishing the build. They have exhausted their mechanical capabilities so I've told them to finish the rest of the areas they can and get me the truck and I'll work on getting it fired up.

Originally Posted by mr48chev

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/

pretty close... mine is the 70004, 500 HP version.