Help? Rough idle & blow by

infidel_duramax05

New member
Aug 21, 2015
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Hello everyone new to this forum, I got a 2007 lmm silverado, picked it up with 116k miles on it about a year ago, I just recently did an oil change on the truck last saturday, only 2 liters came out when I drained it, after finishing the oil change I noticed a rough idle. Removed the oil cap noticed blow by. No white smoke just clear if that makes sense. Drove it around the block and boost, egts, and everything looked normal except the rough idle. The next day turbo wasn't getting power. Took it to a well known shop in AZ on Monday and they did a compression test and checked the glow plugs. Everything is normal. They believe it is the harmonic balancer. They are going to check that out tomorrow. But that wouldn't explain the loss of oil and blow by correct?
My lmm has some mods - efi live by anarchy diesel, afe air intake, afe straight pipe.
 
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