carbon

  1. jbrickman0000

    Carbon buildup due to free-flowing exhaust and/or K&N filter?

    I was wrestling some major carbon buildup until recently, on my 1998 Tahoe, upon which a past owner bestowed free-flowing exhaust duals. I ended up replacing all plugs and wires, which helped for a while, but then carbon got plug #4. I replaced the K&N air filter with a standard one, and that...
  2. T

    BMW running, misfire issues, black spark plugs HELP!

    Looking for some help with my 116i F21. I have had the car remapped now for maybe 3 years and have had multiple issues with misfiring. First time it happened, coil pack seemed to resolve the issue. The next, ECU repair. The next I send the ecu back for repair again, no issue so coil pack +...

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