2003 volvo isx15 cm570 issues

[Rawze]

#1. Max boost that should be seen for the engine under 100% full operating loads should be about 36 psi or so. Is the waste-gate unit and feed-back circuit properly hooked up and working?. Is it stuck partially open?.

#2.. you should have the exact program according to the engine ser#... and not some alternate program with bigger HP shoved into that ecm. This especially if you have been having issues.

#3... WHY did you not go to an actual Volvo stealers$it to get the ecm replaced and had the OEM program according to the engine ser# back into it, instead of some 3rd party yahoo unknown from some 3rd party repair shop do it?. That does not make any sense. For all anyone knows, it could not even be a genuine, 100% factory CM570 program. And it the ECM purchased form the OEM?.. or is it some used/repaired garbage?.

#4.. what you are seeing for the engine control state is exactly that. The engine doing exactly what it should be doing ... and it is 100% normal for it to transition in and out of fuel-air-mix hold-back conditions because the turbo is mechanical, and it takes time for it to spool up when you hard accelerate. - What your seeing is perfectly normal.

- What is not normal is if it only getting to 27 psi boost max. It being a Volvo,.. they have restrictive front ends.. and horrible air flow thru the CAC unit vs other trucks. Make sure that ...

A> it does not have an after-garabge CAC unit installed on the truck like a duralite or other Piece of s#it, non-OEM CAC unit.

B> Pressure test the entire intake air system to 30-psi and ensure it does not leak down more than 10 psi on one minute. If the intake is leaky then the turbo will struggle to make proper boost.

C> Remove the exhaust piping BEFORE THE MUFFLER and see if the boost response improves. If it does then the muffler is getting clogged up. <- this is a very common problem with old trucks and everyone seems to ignore or over look it these days.