Most of you guys know that your 4.3 is designed to operate at it's most efficient with the EGR that works. I have been noticing a little exhaust smut on the body @ the tailpipe and I immediately thought the van is running rich. My first thought was the Fuel Pressure Reg. was leaking. I started to get the SES light and it was a code 32 - faulty EGR. I replaced my EGR motor this past weekend with great results. I'm getting an average of 18.6 miles per gallon - up by almost 2.8 MPG. The EGR motor is nothing more than a computer controlled valve that allows a little inert Exhaust gas enter the combustion chamber to help fill the space. By doing this the small mist of fuel is contained in a smaller available area within the combustion chamber. THe engine thinks it is smaller than it is and uses less fuel to rotate the engine. There are different types of EGR motors - some are computer controlled and some are vacuum controlled. Either way, these can become lazy in their operation and completely fail due to spring or diaphram fatigue - depending on the type. My EGR part cost $ 96. It should pay for itself in a few months.
The point of all this is your engine will only run at it's peak effieiency if all of the emissions parts work correctly.
I hope this helps some of you in your quest for better MPG.
The point of all this is your engine will only run at it's peak effieiency if all of the emissions parts work correctly.
I hope this helps some of you in your quest for better MPG.
