SL/R107: EXHAUST PROBLEM
Thread Starter
Newbie
Joined: Dec 2008
Posts: 6
Likes: 0
From: florida
1981 380 sl
EXHAUST PROBLEM
380 SL 1981, WHEN I DRIVE THE CAR A FEW MILES AND STOP IT WILL IDLE A LITTLE ROUGH, BUT NOT ALL THE TIME. WHEN I EXELERATE AND PUNCH IT BLACK WILL COME FROM EXHAUST. WE CHECKED THE TIMING CHAINS THEY ARE FINE, ALSO CHANGED THE O2 SENSOR AND PLUGS. MECHANIC SEEMS TO THINK THAT THIS IS UNBURNT FUEL. CAN ANYONE GIVE ME IDEAS OF WHAT TO CHECK OUT NEXT. CAR RUNS FINE HAS LOTS OF PICKUP EXCEPT FOR THIS PROBLEM. THANKS
Senior Member
Joined: Sep 2007
Posts: 270
Likes: 3
From: Overland Park, Kansas
SOLD both: 1987 560SL 2003 ML320
Black from the exhaust is either carbon build-up or the fuel mixture is too rich. Has your mechanic checked the coil? That can effect the idle somewhat. One alternative would be to try a different mechanic! 
