I will take alook tonight if I remember...

But here is something to get you going:

There is a black plastic cover on the front of the engine with the Merc star on it. You can remove it just by pulling on it. Once it is off you will see some little solenoids to the lower left (as you are facing the front of the engine). These are controls for the EGR valve. They have a couple of little tubes that lead to the EGR valve which is somewhere in that neighborhood. Should be a round metal thing with a pipe going to the exhaust manifold. I will try to take a look tonight and give you a better answer tomorrow. I am not sure what needs to be cleaned though. Hopefully someone can help with that info.

Mike

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra