Hi,
I have a ML320 2000 with 165K miles. Code reader shows P0303, misfire in cylinder 3. After visiting a Mercedes Benz dealership, they told me I needed a new fuel pump, MAF, ignition coils and spark plugs with new wires! I declined the service because of the cost and the dealer's uncertainty that this would fix the problem.
I installed a new fuel pump (fuel lines were replaced @ 50K, spark plugs were replaced at 100K), all new spark plug wires, and 2 new plugs on cyl. 3 with a new ignition coil. It is still sputtering and eventually it chokes. I ordered an OEM MB MAF, coming in on Monday. If that doesn't solve the mystery, what is left to do?
Any advice will be considered and greatly appreciated.
Thanks in advance, John.