Thread: My Little Red Muscle Truck

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DOD is a system that uses engine oil pressure to control up to 4 lifters and shut down their operation under cruise conditions. It will also shut off the fuel to those cylinders too. It is a scheme used by GM and Dodge to get a tiny increase in fuel mileage on the bigger V8's. The problem is that it is failure prone on higher mileage engines. The special lifters fail and can wipe out the cam. This fills the engine with metal and is usually a death sentence. Folks I have talked to that disabled this system in the computer reported only a 1 to 2 mile decrease in fuel mileage. The best way to get rid of it is to replace the cam and lifters with non-DOD parts and plug the DOD oil passages. That's a big expense job if the engine is still in the car.

There are virtually no high performance cams available for it either.