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Solved: switching the "Crank low res" to a zero from a 1 got me spark, and it started up first try.

Do I need to segment swap the "system" segment also?

Hi guys,

I'm swapping in an 04 LM4 from an Envoy into my 04 ZR2 Blazer.
Stock block, ls1 car intake, L59 injectors, and running the stock Blazer's P59 PCM with an LM7 cable throttle body and...

Thanks, I will be trying that first.

happy new year everyone, anyone have input?

As seen in the below wiring diagrams, the 04 blazer and 99-02 silverado share PCM pinouts, so would be super easy.
unfortunately the 03/04 silverado use different pins in different ways.

Ideally...

Hello everyone,

I'm swapping in a 04 truck 5.3 into an 04 Blazer, but noticed the wiring/sensor routing and pcm pinouts on the blazer are more similar to the layout in the blue/red ~02 (I believe)...