Recent content by CSM diesel

tjkj2002: I agree. Do you know if there o2 sensor(s) are 4 wire heated or 2 wire? A failing 4 wire heated o2 sensor will not allow open loop to be achieved either as temps are never reached.

Mobil 1 oil has been used since it has been in my possession. There is synthetic lube in everything, diffs, t-case, and trans. And the air filter is a clean K&N "drop in." I just think it is the short commute and less than "up to temp" engine that is causing the substantial loss in mpg and...

I have a '03 libby with around 60k miles. MPG's have been acceptable (around 19mpg) up until this winter. Now it gets around 12.5 to 13 mpg. And now there is a white-ish colored goop inside of the oil fill cap neck. I believe it is coming out of the hose for the crank case vent. My commute...