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2015 Freightliner Cascadia with a DD15 came in white smoke, bad idle and no power. Performed various tests to confirm the issue and tried to find the root cause of the problem
A compression test can help narrow down any potential damage or problems. An Idle Speed Balance Test can help, injector cut out test and also a FSIC.
After the first compression test showed the terrible numbers, a valve adjustment was performed and then another compression test. Some improvement was made but the damage may already be present and the engine may need to be repaired.