03 sierra 4.3 to 5.3 swap(i need help)

[Lextech]

As far as I know the 03-05 DBW parts are the same. I won't swear to it but, I think so.

Jeff

[00_Silverado_Z71]

My pedal just bolted in.

He's referring to my truck and mine did not just bolt in I had to take the entire dash out to remove the whole pedal assembly from the firewall my old gas pedal had to be cut off and then we had to modify the mounting bracket to bolt the new pedal to. Not sure if its because my truck is a standard or not but it was just a pain. When I went to the salvage yard I removed the DBW stuff from the same year truck as mine an 04 and even a standard truck and I wouldn't of imagined they made that much different stuff in the same year but how it was the the salvage yard 04 was no where near how my truck is.

[Frenchy]

God damn. Mine's a standard too, had the studs on the firewall for the TAC module too. Maybe someone f'd up on the assembly line and put a 4.3 in by mistake.

[sonnychills]

Well I got bored today and compared the pinouts from a blue/red and a blue green ecu and found a few things different, not many. One a blue green ecu the blue side has a starter Enable relay (pin 39) and my harness from 99-02 doesn't have a wire there. My ecu is a blue/green but was told it was programmed to work withthe older harness.... Hmmm!!! Other differences I found was sone ac related things but I plan to pit ac in it eventually so still trading out for a 03+ harness. I'm pretty sure that my starter problem was from the block thy goes into the fuse box. Also I had to put a ns pigtail on the harness(7 wires) and 4 of them go to that block!! Which I'm assuming are in completely diff pins that an 03 truck uses. Ideally hope once I get the dbw stuff this thing will start right up. I miss driving my truck, the daily Honda just ain't doin it for me IMO

[00_Silverado_Z71]

God damn. Mine's a standard too, had the studs on the firewall for the TAC module too. Maybe someone f'd up on the assembly line and put a 4.3 in by mistake.

Must have I don't have the studs on he firewall either my truck is all different from the 2004 I've been getting parts from at the salvage yard. Ideally one you put all the 03+ parts with the 03+ truck like it should be from the factory it should work.

[sonnychills]

Well got to looking at my pedal yesterday and I found out mine is gonna be a pain! It's part of the entire bracket lol! Gonna get my cutoff wheel and go to town... New harness should be here mid week next week, then gotta find some time to go get the pedal and stuff. Found the pedal, wire, and module for 75 bucks. Also found the throttle body for 48 bucks, just hope they still got em when I go up there...

[00_Silverado_Z71]

Yea yours sounds like the same as mine was as long as you cut the old bracket off all the way just drill 2 holes and mount it. I had to space the bottom out a little bit to get full pedal travel.

[sonnychills]

Yeah I took a pix of it yesterday, I'll post as soon as I get on a computer. But yeah Thad what I was thinking I needed to do. Hopefully I get some progress on this thing next week, but I gotta wait for the new harness.

[00_Silverado_Z71]

I'm ready to get back to work on mine all I have left is to finish putting in the new harness and bolting up a few minor things and some minor wiring and it's done

[sonnychills]

That's about what I gotta do plus install the pedal, other than that just wait for the harness which will be here next week. I already had a tuned ecu but was for 99-02 truck so I sent that back as well that should be done by the end of next week I hope but I'll have everything else ready so when it gets here plug it up and go for a spin.