W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

1985 300D loss of power after 20-25 mins

My wife has been driving our 85 the 35 mile trip to work everyday and has had the same problem twice now in the last couple days. After about 25 mins of driving at 70 mph, the car would lose power like a clogged fuel filter. I drove it today and it started to do the same thing after about 30 mins of driving when I floored it up a steep hill near our house at about 55mph. The fuel filters are both fresh with a new priming pump and the air filter is clean. The loss of power is temporary. The car feels fine again after slowing down or stopping.

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300D Hard Start Hot and Sporadic Power Loss?

Hi there. First i want to thank everyone at MercedesSource for all the help to us. Thank you. I lump these two symptoms together because they seem to possibly be related. First, is the regular occurrance of hard starting only when the engine is still warm. My engine starts great when completely cold, i never have to crank more than a second. But most often when i return to my car after it has sat for up to 2 hours and is still warm , i have to crank three times usually, and sometimes 4 or 5. And then, sometimes there is a real loss of power that accompanies the car after i am started.

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79' 300D loud clunking/rattling from rear end on right turns

My 1979 300D started making a very loud and concerning metal on metal rattle about two days ago on my home. I didn't do anything to warrant it either, it just started around a 90 degree right turn at about 15 mph. Now, it makes the sound which comes equally from both sides every time I turn right at greater than 5 mph and progressively gets faster with speed. It is definitely a rotational sound too.

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86 560sel low rpm sputtering

My 86 560sel sputters as i first step on the gas. At about 1500 rpm the engine picks up and runs like the beast its supposed to be. When i come to a complete stop and the car is still in gear the engine misses constantly. If i just put it in neutral it revs a little and runs smooth again. I just bought this car for next to nothing and put heat in the gas tank, along with a good amount of the recommended "premium" fuel, and it seems to have helped a little bit so far.

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My 1985 300td wagon will not idle

My 1985 300td wagon will not idle. I cleaned all the lines, fuel filters, and even installed new injectors. I checked all the vacuum lines to the best of my ability. It is not starting as easily as it used to, takes some cranking. I turn the idle screw up so that it runs at high rpms so that I can crack the lines to see it fuel is getting to the cylinders. Everything seems to work fine, untill I start turning down the idle screw; then it stalls. I''ve tried ''everything'' but can''t seem to get it to start and idle as normal.

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'76 300D intermittent odometer/jumpy speedometer ??

My odometer stopped working about a week ago for a day. It's worked 90% of the time over the past week, but there's a problem in there somewhere. Also, my speedometer is jumpy under 15mph. Not sure if the two are related. Took out the instrument cluster and noticed that one of the corners on the speedo cable is rounded. Could that be causing both problems? Also, any tips on how to test and see if the odometer gears are slipping? By the way - only 95k actual miles, so the odometer hasn't had that bad of a workout.

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1985 300D turbo - oil dripping from turbo

I am slowly working my way around the engine cleaning and searching for oil leaks. Around the turbo I have 2 leaks. One in back, (from misaligned breather drain tube) and one in front. Looking from under the car up, the boost pressure control valve (correct name?) looks like it has oil dripping from it. Not knowing how turbos work, is this a place for oil escape?

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