Cat injectors

Have you ran the truck on cruise to see if the fuel pedal has a wore place on it? You could have a dead spot on the sensor and cause that but it would run proper on cruise. If you have fuel pressure at spec and injectors passing cutout I believe you would be wasting money on injectors. Did they test the truck sitting in shop or did you do a road test with cat et? All the sensors on the truck are mechanical combined with electrical. I had a very low boost problem once that ended up being the ecm not reading the boost. The boost and both timing sensors can go bad and not be visible to a normal et reading without a roadcheck.

 

Have you checked the turbo for any damage?

There was a guy on here not too long ago that had engine work done and when he got it back had half the boost and no power. He was stumped also cause it ran fine before work was done to it. It turned out that whoever did the engine work didn't keep things clean and eventually dusted both turbos. I hope this isn't your case.

Keep us posted on what you find to fix your problem, good luck.

 

The turbo fins will have nicks or bent blades. I will see if I can find that thread I was talking about earlier. He showed some pictures of what happened.

The way it sounds your turbo has been checked and verified it is ok.

 

It would look like this

 

Here is the thread.

https://www.thetruckersreport.com/t...er-overhaul-cat-c15-2006.328934/#post-5609960

I was wrong on how the turbo got ruined. It was something that got sucked up from when his engine went down after rebuild. Keep in mind this is a twin turbo acert.

 

One thing I haven't seen, maybe I missed it. Did the check and see if the cac has a leak??