Ok, here we go.....

Replacing the radiatoer today, the plastic tube that the hose going to the expansion tank is cracked, apparently from over-tightening......Found a radiator locally for 200 bucks with a lifetime warranty.....I'll be changing it out this weekend.

Next, check engine light came on January 29, (97,537) miles on odometer, code P0410, cleared code.......Code resurfaces this morning, January 31, odometer reads (97,649)......Approximately, 150 miles until code resurfaced.

Secondary Air System....I did notice that during acold start, I get a vibration from the front of the engine for approxiamtely 60 seconds......From what I've read, it's quite possible that this could be coming from the air pump....

Did some research in the archives, the P0410 code can be anything from a lazy oxygen sensor, to a fuse, to carbon build-up in the system.....Found a few external links that show how to disassemble Secondary Air System components and clean.....I will systematically attempt to diagnose the source of the fault before getting to that point.......I do suspect that the previous owner may have used regular gas at some point......Initially, when I purchased this vehicle, 6 days ago, I was fully aware of the fact that upon coming to a stop, the vehicle had a rough idle......All other drive ranges, the vehicle runs silky smooth.......With 97,000 miles, I'm going to assume that the spark plugs are in need of replacement....

Despite what I'm experiencing, I still faind this M class to be a most fascinating vehicle......With 97K miles, I expected to have to do something with regards to maintanace.......I used to do all repairs on my 1997 E320, so I'm not intimidated by this car......Would like to find a repair book with schematics......

Anyways, expect lots of posts from me, I intend to become an expert DIYer on the ML320....I will also post the external limks that I have found regarding this vehicle.....My wife has also found a site that has owners manual, radio manuals, etc in pdf format, I will post the links as well....

Antbody wanna chime in on the P0410 code, please do!!!

Once again, thanx to all!

Big Dee