I noticed my problem when traveling to the California mountains on July 4th weekend. As I hit 2000 ft. or so, I began to notice significant power loss. Once I got to 4500 ft., I had to turn around and find a place to park the car for the weekend, as I had almost no power left. I was able to make it the 5 hour journey home later that weekend, but experienced intermitant pwr loss on the fwy, sometimes traveling 70 was fine for an extended period, and sometimes the car slowed to 45.

At first I thought that this might be the result of extremely poor gasoline, as the problem started almost immediately after filling the tank. So when I got home I drained what remained in the tank, replace the fuel filter and all of the neighboring fuel hoses which were old, cracked and leaking. While I finally got rid of some lagging fuel leaks, I still had the intermitant pwr loss problem. I subsequently replaced the fuel relay, but this did not help.

As I have mostly been driving around the city I left the problem for quite some time at it seemed manageable around the city. But I recently started noticing an odd smell, and when checking into MercedesShop I saw a sulfer like smell can sometimes point to a clogged Catalytic Converter. So today, I had a muffler guy cut the pipes so we could look into the Cat, and it was clean and clear, no clogs.

I recall others discussing the O2 sensor as a possible culprit for power loss. Any ideas from the group? I can really use some help in fault isolating this issue as my plugs are only about 6 months old, my distributor and cap is about 18 months old, the injuectors and pumps are also about 18 months old. Just not sure where to look in to next.

Your thoughts are appreciated.

Steven

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)