Okay gang, I need some help here... this is on my F150 but the emission end is going to be the same. I posted on most boards I know of to get advice on what could have caused this problem.
My HC's and NOx's were high. The HC's were about 20ppm over and the NOx's about 900ppm too high.
Any clues as to what would cause this? The truck is a stock internal motor (stock cam, stock E7s, etc) just all boltons is all. I replaced my EGR setup (EVP and EGR valve) last year and installed a new TPS then also.
I also now have just a single high flow cat too. There's an adjustable fuel regulator on there set around 42psi and the BTDC timing is 14° too.
What's my next move?