Hey All,

I have a 2000 S10 with a 5.3 swap. The 5.3 has a LS1 intake, injectors, throttle body on it. Would it be easier to run a LS1 ECM and harness or a 5.3 ECM and harness? Transmission doesn't matter, it has a TH400 in it.

Tuning will be done with EFI Live.

Thanks,

Chris

 

There is really nothing different between the two other than how the harness lays on the engine.

 

You want to use the harness with a dbc throttle body connectors. Injector pigtails are different but those arent a problem to change.

 

Any LS car or truck will use the 12200411 svc number pcm that uses a drive by cable throttle body. As far as the harness a lot of that depends on basic asthetics only as they do the same exact function when used with the above PCM. Car harness is more hidden and discrete and the truck harness looks like someone crapped a harness on the intake.

When I did my sonoma the reason I chose to use the f-body pcm and harness is from a basic a/c, and cooling fan operation standpoint.
If you use a pcm that is flashed for a f body it allows you to use a 3 wire pressure switch for the hvac compressor clutch control and the pcm has dedicated high and low speed cooling fan control capability that when coupled with the 3 wire pressure switch above allows the pcm to switch from high to low fan speed based on liquid refrigerant pressure and engine coolant temp.