Another low power isx870

[Titan313]

Short story. Bought an older Volvo with a bad cm870. Had a good donor engine. 10 speed manual , as soon as you switch into high gear (5th) it only catches low rpm and takes forever to pickup. Pulling 40k is miserable , and going up a grade is a struggle. It is a 400hp but from what I hear they should pull 40k no problem. This was 2 years ago , I was not very informed about these engines. So I welded the egr valve shut and unplugged it. Still not much power. Not sure if the previous owner had the ecm flashed.

** only get a little black smoke when she bogs on a lower rpm going up.

- changed turbo
- changed actuator
- replaced exhaust pressure sensor
- replaced manifold pressure sensor
- I plugged in the egr valve and unplugged the egr temp sensor today just to see what it would do. Same performance.
- Onboard diagnostic shows not codes for sensors.
( or do I need a scanner to read codes?)

It’s still a healthy engine with some life , I just really want to get it purring.

•• I have yet to clean out the exhaust pressure sensor tubes

Any suggestions are appreciated.