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Catalytic converter?, do you have a rotten egg smell after driving for several miles? 300d is a diesel motor,does not have a catalytic converter, you need fuel filter changes, are 2 on drivers side of engine and do a vaulve adjustment, if problem still it may need injection pump adjustment, try filters and vaulves first. n0rt If your car is a turbo model then most likely the boost reference tube to the ALDA device has come loose. The turbo seal can also fail, but is more rare. Fuel filters are a possibility. Replace both primary and secondary filters. The valves should be adjusted yearly. I like to do them in the fall for maximum ease with winter starts.

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Q: On a 1985 Mercedes-Benz 300D Need to step hard on gas pedal to increase the speed and on hwy it will not go more than 55 mph Seems like engine is not getting enough fuel what is wrong?
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