Jjblur

2014 sierra 6.2. Has headers, afm delete, tsp stage 2 cam, whipple 2.9. Truck is running incredibly rich and gas is going in to oil. Cant find a vacuum leak. Replaced 02s, plugs, removed blower and found split in bypass valve and replaced iat and harness while at it. Truck still idles very rich. It used to fire up cold at 1200 rpms then gradual come diwn to idle at 750. Now it fires up straight to 750 then to arkund 650. When i let the truck sit for 45 min after initial crank it will fire up to 1200 then go back down. So weird. Any ideas. Injectors or bad hpfp?

Jonblarc7

Can you post the tune and a log?

Jjblur

I dont have hptuners yet. I figured it out though. The hpfp was leaking filling the crankcase with fumes. The pcv system was sucking it back through into the intake causing a rich condition. As soon as i unplugged those the stft wiuld go to zero or close

Jjblur

Guys im at a loss. Replaced the hpfp. The truck idles better but its still really rich. Stft are around -6 to -12 at idle. Vacuum is good at 16-18 in. Replaced blower oring. And bypass actuator. Its throwing codes for bank 1 sensor 2 codes but i have no rear 02s. Any ideas

Jjblur

Also replaced iat sensor under blower and new map sensor. Idk

Jjblur

Guys im at a loss. Replaced the hpfp. The truck idles better but its still really rich. Stft are around -6 to -12 at idle. Vacuum is good at 16-18 in. Replaced blower oring. And bypass actuator. Its throwing codes for bank 1 sensor 2 codes but i have no rear 02s. Any ideas