Ok, so I got my wideband installed and discovered a huge problem, my air/fuel ratio is all over the place. With the base tune from hemifever, it can drop to 8.5 and climb to 16 all in the same rpm range and throttle position. It has been washing down my cylinder walls and ruined my oil. So the truck is parked again while I figure this out, and hopefully I didn't do permanent damage to this motor that has 40 miles in it now.

If anyone has any ideas, feel free. I have checked the tps, and it appears to be working. My other concern is that the knock sensors are wired backwards, but unless its cause the whole harness to go haywire, I can't see it causing this. I also think the shotty exhause shop gave me an exhaust with pinhole leaks I the welds, and I think I have a leak around the flanges.

Another thing is the spark plugs are a different range than stock, which was recommended by some people on DT forums to go with this cam. Also, I'm not sure if it would matter, but I removed the crankcase venting from the air intake to just a filter on the filler stack. All the pcv action takes place inside the manifold so i am pretty sure its ok like this, whereas the 4.7 had the tubing external.

Any hoo, I am not going to start troubleshooting it for a couple weeks, 'cause the wife is going into the army then, and will be leaving so I'm spending some time away from the beast.

 

Here's a video of my woes. Does anybody have ant idea what could be causing this? I got a new tune from Sean and it didn't solve anything, so something's gotta be going on.

 

This just hollers fuel system at me.

Getting the proper fuel pressure?
Pressure regulator working as it should?

Not enough fuel = lean mixture on acceleration.
Too much pressure from the regulator sticking or simply not reacting fast enough can actually keep an injector from closing. (mix a 22 on decel)

Remember, perfect world air:fuel mixture is 14:1.

I also have to question the accuracy of your fancy little gauge there. Sounds a bit too healthy to actually be running that lean (8:1) under heavy acceleration.

 

I was having level sending errors prior, due to something exposed to the elements because the sender only failed when it was wet in the bed of the truck. But fuel delivery was always ok. Yea, the innovate isn't the best, and they say I don't need to calibrate it with the innovate gauge because they are synced. I also just became aware of a leak somewhere precat. Flanges, header gasket, or the new welds, I'm not sure. Exhaust shop will look at it tomorrow because they have a post cat weld to fix anyways. I will look unto the pressure when I can.

Even if the gauge isn't that great, it shouldn't be that bad. It may be getting fresh air from the leak, where ever it is.

 

I would like to see what your STFT and LTFT are doing in real time at idle and under load. I disagree that it is a fuel system issue at this point. I think this is in tuning and/or exhaust issues and/or bad wideband. Most of you acceleration pulls were rich as hell, yet I didn't hear any stumbling: which leads me to believe that the gauge is not reading your exhaust correctly. 8.XX:1 will typically make the truck stumble and fall on its face @WOT. On the race car, 10:1 was barely drivable.

 

That's kinda what I was thinking at this point after looking at other peoples experiences. That wideband is just dancing and the truck barely falters. It does react though, to the fluctuations, just not as much as one would expect based on the numbers.

So my theory is, exhaust leak at the flange or header gasket. Fresh air gets in and causes the o2s to react. They react. The truck stumbles a bit, but the wideband goes crazy. I will calibrate it when I have the chance. The manual says I don't need to if I use the innovate gauge. But I'm going to anyways since its acting up.

 

OK, exhaust is fixed and I recalibrated the wideband! Its working perfectly nowz