When I tried the fresh air mod for the first time, the engine was still warm and I noticed quite a bit of sludge build up in the egr unit. I had the intake manifold off about <10k earlier and cleaned both the egr and the manifold out. At first I just wanted to test the idea out, so I turned a piece of pipe down on the lathe and attached an air filter to one end, and wedged the other side into the egr pipe that connects to the exhaust manifold. Started it up and let it idle. No problems. So then I took it for a 10mile drive around the area and no lights came on, the car seemed to have a little more pep. I put the car back in the garage and began making a moke permenate fixture to hold the filter in place. Put it on a few days later and with in a few minutes, it poped a CEL light. My guess is that the hot exhaust gases loosens up the build up in the egr valve. When the cooler ambient air comes in through the filter, the dirty egr valve doesnt operate as it should throwing the CEL. Im goin to try this mod again the next time I have time to remove the intake and egr to clean them out. Its the ONLY way to finally tell if this mod works or not.

__________________
2002 G500 74K
1998 E300 200K and rising
1995 S600 73k


"Some people spend an entire lifetime wondering
if they've made a difference. The Marines don't
have that problem."-Ronald Reagan

"Never tell people how to do things. Tell them
what to do and they will surprise you with their
ingenuity."-General George S. Patton