knocking sound that sounds like #1 cyl rod bearing. someone said its carbon build up?

Asked by Jan 26, 2016 at 01:08 AM about the 2002 Cadillac DeVille DHS

Question type: Maintenance & Repair

1 Answer

95,075

Carbon in today's engines is rare, I have only seen it one time and that car was only driven at the most 1 mile a day, but it never really knocked, just got very sluggish, O2 codes, EGR plugging up, stuff like that, so I really doubt it is carbon.

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