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Originally Posted by xccman
1981 380 Sl idles just all of a sudden like the car had a radical cam in it. Very ruff idle until 1200 or 1500 rpm. Have replaced frequency valve, oxygen sensor, excess voltage protection unit and the spark plugs. Upon replacing the plugs I found all the plugs on the right side to be very black with carbon. While the plugs on the left side were not a perfect light brown, they were close and much better. Also, the fuel economy gage on the dash indicates the cars economy is way off from what it was. Any ideas on what suddenly went bad with this car would be appreciated!! Help  |
Do you still have the original single row timing chain installed? The 81-82 380SL's have a high failure rate. If it jumped a tooth or two on one of the two cams, it will do what your experiencing. There is a conversion to double row timing chain available from MB.
If that is what is happening, please don't run your engine until worn chain and components relating are replaced. If you let it go, it will experience catistrophic failure! BB