1999 MITSUBISHI 3000 GT KNOCKING NOISE COMING FROM THE ENGINE

  • Tiny
  • 2CarPros-Archives
  • 1999 Mitsubishi 3000GT
  • 6 CYL
  • 2WD
  • automatic
  • 103,200 miles

1999 Mitsubishi 3000 GT mileage: 103,200. I hear a knocking noise coming from the engine. I can hear it sometimes at idle but mostly when the engine is revved to 2000 to 3000 RPM. The sound seems to go away if I unplug the spark plug to the number 5 cylinder. Any suggestions on what it could be?

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Wednesday, November 10th, 2010 AT 10:13 PM

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  • Tiny
  • 2CarPros-Archives
  • Member

From the tests that you have described, it could indicate a possible broken piston or broken ring, or a failing wrist pin or rod bearing on the number 5 cylinder.

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Wednesday, November 10th, 2010 AT 10:14 PM

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