Generation IV External Engine - GEN 3 - GEN 4 Harness differences..

There any differences in the harnesses themselves for the DBW motors to the DBC motors? I picked up a DBW 5.3 (assuming it's a gen 4) and have a drive by cable throttle body sitting around. Wondering if I put that on, will I have to change anything else in the harness and will my computer still work since it is programmed for a GEN 3 5.3???

A lot of Gen 3 engines are drive by wire, and all Gen 4 engines are drive by wire. You need to look at the cam and crank sensors to figure out if it's going to work or not. Gen 3 engines use 24 tooth crank wheels and 1 tooth cam sensors in the block at the back of the cam. Gen 4 engines use 58 tooth cranks and 4 tooth cam's, and the cam sensors are in the front in the timing cover.

SOME early Gen 4 engines use 24 tooth wheels, and you can run them with a Gen 3 computer, but that's LS2's, and I think it might only be LS2's, and not any 5.3's...but either way, a Gen 3 computer will not run a 58 tooth Gen 4 engine without a signal converter box from Lingenfelter.

Completely forgot about the whole reluctor wheel thing lol..the cam sensor is on the back of the block where it is for a gen 3 motor so I take it that it's a gen 3

what would it take to make it a DBC? just the throttle body then?

pay attention to the cam, crank, maf, and injector connectors

Completely forgot about the whole reluctor wheel thing lol..the cam sensor is on the back of the block where it is for a gen 3 motor so I take it that it's a gen 3

what would it take to make it a DBC? just the throttle body then?

Yes, if the cam sensor is in the back of the block (right on top behind the intake manifold) it's a Gen 3 engine. To make it DBC, you just need a compatible TB, and if the intake on it doesn't have the brass inserts to attach a cable bracket, you can rob them from another manifold and press them in too.

You will need a RED/BLUE PCM to run the Drive By Cable as well. Some of the GREEN/BLUE PCMs have IAC drivers but it is easier/cheaper to find a RED/BLUE. Hope that helps.

JON
PSI

You will need a RED/BLUE PCM to run the Drive By Cable as well. Some of the GREEN/BLUE PCMs have IAC drivers but it is easier/cheaper to find a RED/BLUE. Hope that helps.

JON
PSI

Yeah, even if you run GTO code in a Green/Blue, it won't work unless it's got the drivers that a lot are missing.