AlwaysOnKill

I'm working on a friends truck and I'm having some Tbss issues .
Truck is a 2001 gmc c3 with a 78mm dbw tb

We put on a Nnbs intake with 87mm dbw tb.
We used the casper ls6 to ls2 wing adapter .
I wired it up using diagram from here LS2 throttle body harness adapters

We had to swap the brown and yellow wires since the Tb motor was going to 100% with the key forward .

It idles correctly for a second then raises idle up and reduce power light comes on .
I'm at a loss . Help!

Wolftrk99

iTrader: (5)

What codes is it throwing???

CrisKyro

Did you ever figure this out ? Or are we stick with the 78mm on the 01-02 dbw 2 connector set up?

Bluecollar Hotrods

iTrader: (18)

The stock throttle body isn't as bad as everyone thinks. A friend of mine tested an LS3 gold blade on his swap. Then an adapter with the factory TB. They made exactly the same power. (422 rwhp)

CrisKyro

I believe it. I’ve come to the conclusion that the hp per dollar for an LS2/3 throttle body is not worth it for me. I really wish the 87mm gen 4 truck throttle body was more of a plug and play solution. Was he able to see or feel any power band differences with the adapter and 78mm?

Bluecollar Hotrods

iTrader: (18)

The graphs when overlayed mirrored each other. He did say that the throttle response feels better with the 78mm TB. He ended up selling the LS3 TB and X link, and investing that money elsewhere. I worked on a local 5.3L truck, had all kinds of issues with the X link. Put the factory TB back on, made the exact same power and no drivability issues. Those are 2 instances I have personal experience with, as you said - the HP per dollar isn't very good.