My friends truck vehicle 2006 GMC canyon with 5.3L V8 automatic swapped in
- 2003 Silverado 5.3l V8
- 05 trailblazer ext lt MAF, CAI, Fuel pressure regulator, PCM with a custom
HP tuners tune, stock trailblazer injectors I think either 28 or 32 lb/hr
- 07 silverado drive by wire throttle body
- LS2 knock sensors from CP
- 02 Camaro F-body BBK ceramic coated shorty 1 3/4" headers with 3"
collectors
- dual 2.25" exhaust to magnaflow high flow cats to a magnaflow x pipe with
two stainless t 304 magnaflow mufflers
- Bellhousing from silverado also input shaft and pump from silverado 4l60E

PCM wired to control 8 wire throttle body low and hi refs joined together TPs and TPs2 wired to sweep in opposite directions, like the PCM wants to see.

He was getting lean codes and had to use the pedal to get the truck to start

I noticed that the idle scalar was never changed from the larger throttle body so I calculated the ETC scalar for the 78mm and came up with;

78mm calculate area divide by 2 =39mm (39mm x 39mm x 3.141592653589793= 4778.3623mm) subtract throttle shaft area 10mm x 78mm =780mm so 4778.3623mm- 780mm = 3998.3623mm x 90% max throttle opening = 3598.5261mm rounded to 3598.5mm

I am 90% sure this is calculated right, I had him change his etc scalar to this, he then tried it and it would start to easy, he leaned it way out and now it starts 2nd to 3rd crank, but set code P0121 throttle position circuit.

I think the tables below the etc scalar need to be changed as well?

like the Effective area, max, min fail, etc..


any other settings need to be changed?

I posted up his tune before he leaned it out and the etc scalar hasn't been changed in this tune yet.