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Cat C-15, it was the ECM (See post 5 days 2 ago)
Posted to HD/Fleet Forum on 3/20/2008

It was the ECM!!!

I just never have seen an ECM fire two cylinders at once. Something new.

Also on my other post about the Volvo coolant in oil; it was the water pump. When the water pump front seals fail it fills the oil pan with coolant.

Steve Login to read more.