Carbon Buildup: The Silent Killer of Your Direct-Injection BMW or Audi
Your BMW or Audi may start, idle, and drive every day while slowly losing the sharp response it had when it was newer. The problem may not be a failing turbocharger, worn ignition coil, or clogged fuel injector. In many direct-injection engines, the real issue is hidden inside the intake ports: carbon buildup on the…
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