I finally installed the new CP3 and the truck now hits desired rail pressure immediately. The pump was leak and on its way out!.
So now what I'm noticing is when you hold the brake and push the throttle to the floor the desired is only 6k and the truck does nothing. Also if you put the truck on a steep grade it will sit at 6k desired and not move or it will build desired pressure slowly and start to take off. This seems like if I would put a heavy trailer on it would do the same and would be dangerous. I'm not real familiar with Duramax but this seems wrong.
The throttle position sensor is reading and boost had gone as high as 32psi on scanner starting at 14 from idle. No codes after cp3 install.
2002 Duramax LB7 220K
Bosh injectors at 153K
CP3 New Bosh at 220K
Last edited by OkDually; 09-11-2019 at 08:46 AM.