My '88 300E runs well except poor idle and I also get slight surge in acceleration with foot off accelerator when coasting. I was advised to clean or replace air slide and replace injectors. If this sounds correct, what type of solvent to use and, on injectors, any special tools to remove or set up? Replacement parts are Bosch I assume?

Also, cruise control lever works to accelorate, however, it will not hold a steady speed. Any suggestions?

By the way, I have the Mercedes service manuals for my car, but these do not have any real explanation of repairs. The Chilton I bought is poor and covers serveral models - not much depth. Any suggestions?

Lastly, someone recommended non-dust silicone brake pads any recommendations on these as well as year-round M&S tires?

Thank you,
Bill W.

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Bill W

I have the exact same problems with my "new" "88 300 E. Turns out to be 2 different problems:

1: Poor Idle and low speed surge - I fixed that one by tightening up the vacuum fitting at thye power brake booster. Was told that the booster was probably bad, maybe a leak in the diaphram, and that I should pull the vacuum line and plug it. If the idle smoothed out then the booster needed to be replaced. the vacuum line is hard plastic and I had a hard time breaking thye line at any of the junctions so I worked my way back to the booster. Couldent get the line off the fitting so when I put the fitting back on I made sure it was seated properly and tight. What do you know, problem solved. The idle is now smooth, surging is gone and the throttle now advances evenly. Maybe this will help for you.

2. Cruise control - in researching this I found that it is probably the speedometer sensor that is bad. Haven't yet ordered a new one, just found this yesterday. Seems for the '87 and '88 124's, there was a defect in the sensor that causes this problem. Supposedly a cold solder joint on one of the wires. Gonna try removing the sensor ( back of the speedometer) and seeing if I can get to the joints and re-solder. If not, the sensor costs around $52 and I'll replace it.

Hope this helps ...