High Fuel Trims Driving Me Crazy!!!
 

Hey guys...recently installed my Pro-Charger and have not been able to determine what is causing high LTFT at idle. They are maxed out at 25%. The truck is an 04 with a 5.3L.

60 lb. Motron Injectors
D1-SC

We have eliminated the possibility of it being the MAF or the O2's. It has high LTFT's in both banks. Fuel pressure is at 62 psi. I have tried propane and BRAKE cleaner around all of the IC piping after the MAF and around the motor and have not noticed any change in idle. Do I need to try CARB cleaner instead of brake cleaner? My AFR is dead on at 14.7 at idle. I have searched through many pages on this topic and came up with that it is more than likely a vacuum leak, but I cannot tell any change in RPM when spraying brake cleaner or propane around the engine.

The truck is tuned by a very notable tuner with HPT's. Any more tips to help me shed some light on this situation? Could one of my injectors or all of them be messed up? I wouldn't think it would be just one as both banks are maxed out. Thanks in advance for the help. :bang:

Sounds like an injector problem. I think people have been fighting with tuning those injectors for a while.

http://www.hptuners.com/forum/showthread.php?t=14101

Thanks for the link...I read through that thread, but I don't have enough knowledge in tuning to decipher if this is my problem or not. My AFR's seem to be dead on throughout the RPM range and going to 10.8 or so while in boost.

Anyone else have any other suggestions?

Thanks in advance.

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