[Frakenstines_bowtie]

I have this 2003 Silverado I bought for 3k. It has a ton of issues. This truck was a v8 swap. The computer says it is out of a 03 Yukon xl. However I want to ensure the computer is reconfigured right so I’m trying to figure out if there is a way I can pull the vin off the block or something that will locate the Vin so I can reconfigure the computer to the engine

 

[shakenfake]

That is not how it works.

 

[Frakenstines_bowtie]

Can you shed a little light? The truck isn’t starting right. I’m just trying to reverse engineer this swap so I can pin point the issues

 

[Frakenstines_bowtie]

Truck starts like it doesn’t have enough fuel getting to the engine, I’ve replaced MAF, air intake filter, fuel filter.

 

[RedSLEd]

Does that happen all the time, just when the engine is cold, just when it's hot? Is it a flex fuel engine? Have you put a scanner on it? Any codes? What are the fuel trims? More details might help.

 

[Frakenstines_bowtie]

Happens regardless hot or cold, not a flex fuel engine. Scanner is pulling a p0178 code. It’s a base model trim.

 

[Bradley21sanders]

Step #1 What engine was in the truck from the start?

 

[Frakenstines_bowtie]

Per the car fax a 4.3L v6

 

[Bradley21sanders]

Thats what I figured being a base model no wonder it dont work.. see this thread. I imagine someone threw the engine in without figuring out if it was doable and became too much work to figure out. Little more involved.

Official NBS V6 to GENIII V8 swap Guide - PerformanceTrucks.net Forums

GM Engine & Exhaust Performance - Official NBS V6 to GENIII V8 swap Guide - NBS V6 to V8 Swap So basically youre tired of going slow and want some power and obviously you want to swap out that old 4.3 for that massive V8 :devil: so lets get to it. There are some other threads out there but they...

www.performancetrucks.net

 

[Frakenstines_bowtie]

Yeah I have no clue what they did I’m just trying to reverse engineer what they did.

 

[Bradley21sanders]

Well go by that guide and start checking the most obvious things, seems like the biggest hurdle is having the V8 harness and reflash so I might would just get one and swap in or try to find the PN on the current one if its not gone.

 

[Frakenstines_bowtie]

How would I go about finding the “PN” in this truck? And that’s where I was gonna start as well. Wiring harness and the flashing.

 

[shakenfake]

I don't even know why you would buy such a thing if you have no knowledge on the subject.

 

[Frakenstines_bowtie]

Wasn’t my intention to go this far deep, I have mechanical experience just not in engine swapping

 

[Bradley21sanders]

Its probably not there just due to being 20 years old but you can check the harness for the tape/sticker with a part number. I don't know exactly where it is on the 03 if its still there but you can look on the connector (the 888) like shown here and might get lucky

 

[Frakenstines_bowtie]

Bet man I appreciate the help

 

[shakenfake]

If he is running the V8 he already has the correct harness.

 

[Bradley21sanders]

Have you had it running at all?

 

[Frakenstines_bowtie]

Yes it’s completely driveable minus the entire suspension needing to be redone and exhaust

 

[Bradley21sanders]

lord, I missed that. No need to worry about the harness then like mentioned you already must have the right one.