1985 Mercedes Benz 300td Repair Question
1985 Mercedes Benz 300td smog
1985 Mercedes Benz 300td Two Wheel Drive Automatic 150000 miles
exorst pipe bleck smog-only in low speed?
Sounds like its running rich
Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode
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