Just got back from a ski trip to Colorado and had some problems with the 1995 S-350 Diesel. I did all the cold weather stuff like fuel antigel and such but the morning after I got there, when I cranked the car up it started running rough at idle and smoking excessively. It would run a little better after it warmed up at highway speeds but as soon as I slowed down and let it idle it would run rough ( like a miss ) and smoke. I added some Power Service octane booster and cleaner and ran it for several tanks but the problem continued until I got back to a lower altitude. I am from Louisiana. My first guess is injectors. Has anybody else had a similiar problem? How do I test the injectors? Car is running great now I am back home but I know something is wrong and don't want it to happen again if I travel to a high altitude place. Car has 173,000 miles and never had an injector off of it.

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K

??

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K

Here in Canada I found a truck injector rebuilder that can check car injectors - If I bring them in he charges me $10 CDN for each injector. Check around for an injector rebuilder in Louisiana and have your injectors checked - with that mileage it is almost time - and it might be cheaper than going to a MB dealership. By the sounds of your description - I would suggest the only one or two injectors could be culprit. Have them all checked to be safe. The other faster alternative would be to contact Phil at Fastlane and buy and install new ones. They are not hard to change.