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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53986
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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320 ML: 3 cyliner on driver side has no power. i changed the

Customer Question

3 cyliner on driver side has no power. i changed the ignition coil, all 6 spark plug working. but when i unplug the 12 volt cable, no difference in engine speed. it runs by 3 left cylinder but no power
Submitted: 2 years ago.
Category: Mercedes
Customer: replied 2 years ago.
it is ml320 1999
Customer: replied 2 years ago.
are you there ?
Customer: replied 2 years ago.
I am paying almost $50 for this? time to dispute the credit card
Expert:  Marty replied 2 years ago.
Hi, welcome to Just Answer. My name is***** apologize for the wait.
This problem sounds like a plugged up right side catalytic converter. Remove the right front oxygen sensor and see if it will run on all 6 cylinders. If it does it means that the right side catalytic converter is plugged up and will need to be replaced.
Let me know what you find out.