What causes 1 fouled spark plug?
#1
What causes 1 fouled spark plug?
Hello, I am looking at buying a B5 A4 1.8T. The seller mentioned that the car has a fouled spark plug, and that seemed weird to me. What would cause a fouled spark plug on an A4? My concern is that a fouled plug is an indicator of a bigger problem. The car has S4 coil packs, but is otherwise stock. Does anyone know if this indicates a bigger problem or if this is just a common occurrence for A4's.
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