Thanks - and yes my Benz is from California - I know since I replaced the air filter and it was the $65 one that looks like it would work for a Mac truck and sits there off to the front and side of turbo - so now what am I looking for in this Trap Oxidizer? where is it located - and how to I can clean? - I will check my ALDA line - thanks! Adam - when you check your compression do you use a shreider valve inline with testing and do you see what the first reading is or do you crank it until needle stops increasing for reading and call that the compression reading? thanks again
Well, if you call any Mercedes Benz dealership you can ask for them to do a search with your VIN to see if the recall swap was done. If it wasn't done request to have it done on your vehicle free of charge!
But do this quickly because the older catalyst (or was it trap ox?) can damage your turbo.
Since I'm a north eastern I have never seen a California setup before. So I'm sorry I don't know the differences between the two or how to clean them.
If you have access to a Federalized parts you can follow this guide and to get rid of the cali stuff.
PeachPartsWiki: Calf. to Fed. Emissions Conversion
Sadly I have never done a compression test on my vehicle, but from what I've read on this forum and others is any compression reading higher than 300 is good for our vehicles.
Doing some quick and dirty math with a lot of ASSuming, if we all live at sea level (14.7 psi) and the compression ratio from the FSM is 21.5 : 1. I'm guessing any reading over 316 psi is good. I would take this all with a grain of salt, but everything I've picked up from this forum as well as peachparts has been telling me compression numbers higher than 350 are really good.
If the car starts, idles, and runs well than I wouldn't worry much about the health of your car. If your car is slow off the line than check the ALDA boost line and overboost solenoid to make sure they aren't clogged.
Here's a pic of the catalyst
Edit 2: Mr. Govert has the best advice on compression readings below.