If you're really getting 22 MPG, you're getting about as good mileage as any 6.2.
If anthing, if you totally unhook the EGR system, you might get a slight improvement - but NOT just by unhooking the hose from the EGR valve in the intake. There is an EPR valve (exhaust pressure regulator) that controls a shutter valve in the driver's side exhaust manifold. It restricts the exhaust on that side to divert it up to the EGR in the intake. If all you do is unhook the EGR on top, you still have that shutter retricting the exhaust. Unhook the line to it and tie it open with a piece of wire.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
... [Read Article]
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