Don't know if you got any answers, but my '91 300D did the same thing a
few times. After discussing it here, I ended up believing I had carbon
buildup in the cylinders and put some liquid "fixer" in that was said to
break the carbon up. My wife had just started a job where she was
driving 100 mi RT each day to work and those lengthy drives fully warmed
the engine and broke the carbon up. After a week or two of the daily
drives we never had another problem. We had only owned the car for a
week or two when this started - it was exactly as you described - we
would back out of the driveway and be enveloped in a cloud of white
smoke. The car lost power then things cleared up and he problem went
away. BTW, My 91 300D only had 99k miles when I bought it in '06 so it
was seldom driven far and did not warm up properly. HTH...
Wish I could remember te liquid I used but it's been too long,
sorry. But a Net Search will likely provide many hits...
Good luck!
On 2/7/2021 6:24 PM, Craig via Mercedes wrote:
On the 35 mile trip to church this morning, we were driving at 75 mph when
suddenly the engine started running rough and a big cloud of white smoke
came out of the exahust (right into the front of the semi which was
tailgating us). After a couple of seconds the engine started running
normally and the smoke stopped. I checked the oil pressure (pegged) and
the temperature (85 C) and saw and heard everything was OK, so I kept on
driving.
Leaving church, we had a little problem backing up, which I attributed to
the rear wheel parking brakes acting up as they have done in the past.
We went to the nearby supermarket and everything seemed normal. I found
there was a long line to get into the building (yes, again!), so we left
and drove east. We got off the Interstate at Edgewood and stopped at the
supermarket there. Interestingly, there was no line at all and not even
someone watching the front door. I got some of the items we needed, went
back to the car, put them into the trunk, and proceeded to leave --
except the car would not move backward. It was OK going forward, however.
I left the engine idling and checked the transmission fluid level. It
seemed to be high, though I am not satisfied I'm getting the right level
indication when I check ATF levels. I did check the level a couple of
months ago and recall it was OK then.
After getting some help pushing the car out of the parking space (up a
slight incline) we were on our way toward the Interstate onramp. We
accelerated up the ramp and got on the roadway just as the engine ran
rough for a few seconds and then ran normally. I looked back and saw a
large cloud of a little white, but mostly black smoke.
The car ran fine the rest of the way home (15 miles), shifting through
all of the forward gears as it was supposed to. I was even able to get it
positioned so it would roll backwards down the incline from our front gate
to our building, so it's ready to go tomorrow -- we need to drive to our
dentist (56 miles) to have the recurrent infection in Shirley's jaw
looked at.
So, does anyone have any idea what's going on with the car?
Any idea if we will be OK driving to Albuquerque tomorrow?
Thank you for your help!
Craig
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