black_yukon

I have a GMC Yukon with a Procharger. The setup uses an inline pump and an FMU. I'm gonna be dropping in 43lb injectors in the near future, but I'll need to drive the truck to a shop about 40 miles away to get the PCM tuned. Will it be okay to drive in that condition? Also, for the trip to the tuner, should I disconnect the FMU? Thanks.

y2khawk

iTrader: (5)

if you were going with something in the 30lb to 36lb range you could get away with it, PCM still has enough authority with L-trims to make up for the injectors. 42's are just too big.

Install them when you get there, your engine will thank you

ChrisB

Yeah, it only takes a few minutes to install the injectors - just get all the tools together and do it when you get there.

MIGHTYMOUSE

iTrader: (59)

if the car happens to have an adjustable fuel pressure regulator on it, you could install them and crank the pressure back until it will idle.. but otherwise above.

black_yukon

Thanks for the info

ChevyNo1

MM, great idea! I was just thinking the same thing the other day . . . my car is throwing the KR codes where it thinks they're dead . . . P0327 and P0332 ( I think ). I'm wondering if LS1-Edit isn't causing this ( I've heard of others having the same problem ). I've already replaced them, no dice. So I want to put the car back to stock, but I also have 42lb injectors. So I thought, I've got an adjustable FPR, why not just crank it down? You just confirmed my thoughts exactly, thanks! I just need it to idle for a while to see if it sets the same codes.

- Dug

yeary03SS

I haven't actually used it but the fmu has an adjuster screw to lean out the air/fuel for larger injectors. Maybe you can adjust that and then get rid of the fmu at the tuning shop. I saw it in the installation manual.