I have a 2012 Cummins with EFI by Starlite Diesel. It has 127K on the engine. Last weekend I pulled the valve cover and ran the valves and retorqued the head. While I was in there, I gutted the factory crankcase filter and vented it by running a hose down the side of the block. Now if I lug the engine down below 1200 RPM, or get it above 2600 RPM, I get a code for crankcase filter restriction. Can anyone explain why? I would figure with the filter gutted I shouldn't see anything like that.
Thanks
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