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Getting Started. Fouled, damaged, or worn out spark plugs can lead to a variety of engine problems, such as misfires, hard starts, increased emissions, and poor fuel economy. For most vehicles, you should replace your spark plugs every 30,000 miles (consult your owner's manual for your specific interval). It is also recommended that you replace your spark plugs wires at the same time, or you may still experience misfires or other problems.
To remove all the coils, then you need to remove the tank empty and dismantle their support: Now proceed to remove the old spark plug with a wrench of 16 mm. We can see the difference between a spark plug with 60,000 miles and a new one: For placing new spark plugs, use a torque wrench for threading them to 30 Nm.By the end of the spark plug change operation, we will re-assemble the coils, the vacuum tank and the plastic protective cover.o access the spark plugs, the first thing to do is remove the plastic cover office: Once removed the plastic cover, observe the coils and the vacuum tank (coils shown are those that were mounting after spending campaign to replace coils Audi 28E9):