2012 maxxforce 13 boost surging

See if the boost pressure shows anything with the key on and engine off. May just be a sensor or wiring.

 

I got a question. Since you have done a delete of the EGR/DPF who do you take it to when you break down on the road? No dealer will touch it.

 

Yeah, this is the thing, since you have aftermarket ECM and programming, it's hard to point you in the right direction since your problem could actually be software related.

 

Sounds like you have some sort of scanner there. If you can watch engine performance parameter values with it, I'll give you a couple of things to watch for. Fluctuating boost could be problems from fuel pressure in either the low or high pressure systems. The factory ECM could monitor fuel delivery pressure for the low pressure system. It needs at least 60 psi, but most are around 90-110 psi. So watch your pressure while at highway speeds under full load.
The high pressure system has a few things to watch for. The actual Rail fuel pressure, and Rail fuel pressure Desired! The Rail fuel pressure is the high pressure fuel in the common rail and ranges between 7000 psi and 32,000 psi depending on load. Usually at highway speeds under full load it is very close to 32,000 psi. The Rail fuel pressure Desired is what the ECM wants and is trying to command. So with a healthy fuel system, both the actual and desired should mirror each other. If you see desired at 31,000 psi for example, but actual only 23,000 psi, there is a problem. With older units, the high pressure fuel pump starts to get weak and can intermittently lose pressure enough to cause low power. You need to see if you can watch the Fuel Pressure Control Valve percentage. The way it works, the lower the percentage, the higher the actual rail fuel pressure goes. So basically 0% is making the fuel pump work as hard as it can go! Any healthy fuel pump should never go below 20-25%. If it does, this means the pump is working harder than it needs to in order to maintain fuel pressure. (5% is as low as it actually goes, not zero.) So if you see rail fuel pressure no quite meeting desired and your fuel pressure control percentage is below or near 20%, the fuel pump is likely worn out and needs replacement. BUT, if during all this the low pressure fuel delivery is lower than about 60 psi, you have base fuel delivery problem.