Quote:
Originally Posted by ohiomike
Daughter had a 92 300CE with the same problems. Replaced most all parts. In front of different techs. No one solved the running problems. When we put in a new oxygen sensor, it was like a new car. Did you try that even though the light is not lit. Seems the oxygen sensor goes out every 20,000 miles due to a rich mixture which is the prioblem.
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And sometimes even faster due to the M103 tendency to leak oil through valve stems. If you have no oil usage, the O2 sensor should last much longer than 20k miles...