Just bought a 1991 500 SL, 26k miles. Seems to have been well taken care of. A few days after I got it, the CEL came on. The car idles a bit weird, and often takes a few tries to turn over after it's been driven for a while. I took the car to a mechanic who worked on the car under the previous owner. He said CEL is indicating that the idle speed is not correct. Larger issue being fuel distributor is in need of rebuild, which will allow them to adjust to the correct spec, which should solve...
2nd opinion - 1991 500 SL, CEL, rough idle at start, and slow to turnover
2nd opinion - 1991 500 SL, CEL, rough idle at start, and slow to turnover
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