tashspop

I have noticed my stft/ltft bank 2 going high adding to my fuel trims. after several logs it seems occasional but frequent with the only thing I noticed making it repeatable is warmer weather.

so far I have switched my o2's and the problem stayed with bank 2. this morning I switched my fuel injectors from passenger to drivers side and that didn't change anything.

my next guess is exhaust leak or intake leak or wire issue from that o2 sensor.

I have a wideband but it is connected on drivers side. I believe this erratic behavior is what been giving me so much grief trying to get my tune dialed in since I've been watching the drivers side exhaust during tuning. I only noticed this when I went back to watching my o2 sensors.

you can watch my log and see that after a while of driving the fuel trims go off from each other with the bank 2 being a large percentage higher.

tashspop

also is it possible i'm looking at a fuel pump or pressure regulator issue?

danieloneil01

Did you switch the plug wires too? Have you checked the spark plugs or valvetrain? Check for soot around the header gasket and primary connection.

tashspop

i'm going to go through the exhaust today. i can check my plugs too. i just put the cam/lifters/springs/trunion upgrade in there and ported my heads lightly.

tashspop

plugs all looked fine. i went through my exhaust front to back. i had alot of leaks on both sides. i didn't realize how much. i haven't drove and loged yet but the truck seems alot quieter now lol. i'll get time to log today see what happened.

Exidous

iTrader: (11)

Aside from injectors, fuel system will affect both banks. If the O2 swap didn't work I always default to an exhaust leak.