The one in my truck has been disabled, and I've never really looked at it.

However, I have another old one sitting right here that RyanY gave me. When you turn the actuator, there is some slop, but when I apply vacuum to the fitting, it stays closed, but doesn't completely seal the short runners off. It comes close, but I can push it further closed with a finger.

Looking closer, I can tell something about the condition of the bushings in the shaft on the loose piece here. By just starting the rotation at the bell crank, I can tell it's not rotating in an exact circle...bad bushing.

There's no part number I can see on it to be able to tell if it's new or old although I know this one is an old model.

If you wanted to tear it down and or replace it, you need three gaskets for the assembly, plus a couple more for the EGR, according to the manual. Ryany also suggested knife-edging the leading edges of the butterfly valves and at least checking how all the intake lines up in case anything is grossly off that might require some machining.

There are 12 Phillips head screws that hold the valves to the shaft. These could fall out, I'd suppose, and they're right in the intake path. There are 7 bushings, or at least seven support points for the shaft. I guess there could even be two piece bushings or something in there. I can see play in them by lifting up on the valves.

If nothing else, think of the recycling value of the large piece of aluminum left over when you replace it with the new improved part. Which costs $375. Plus shipping.

John B.