After CP3 Mod, my truck has a bad surge. Quick surge not like turbo surge. I used a scan tool to check rail pressure, rail pressure jumps up and down from 21000 to 18000. This only happens at a little more then half throttle. Wide open runs make you crap your pants. Any ideas?

 

Make sure your FCA is completely deburred. If it isn't, it will surge.

 

I sanded all edges with 1500. Works great until mide to hard throttle?

 

Try resetting the APPS. That has fixed more than a couple with similar problems.

 

Ok i'm a dork whats the APPS?

 

This thread has the steps to do it...

https://www.dieseltruckresource.com/...resetting+apps

 

did you check the bore that the valve goes in for any burrs,when reassembling did the valve slide in and travel the full length very smoothly.

 

When I finished the valve went back and forth with out a problem. Smooth as silk. I made sure to check that.

 

I had the same problem and it went away after I installed the edge ez I assume it is fooling rail preassure as it does the boost sensor

 

Is there any other way to fool the fuel rail pressure (smarty)?

 

The new beta version smarty does play w a lil pressure.

Bob