WHEN I took my 2004 BA Falcon ute in for its 150,000km service at my dealership, I was advised of a problem that could occur when servicing the spark plugs. The plugs have a tendency to break during removal, leaving part of the plug embedded in the head, The service guy said Ford was aware of this and takes no responsibility should this arise. Why should the customer be responsible for a defective product? Are you aware of this?
I ASSUME it's a three-valve V8, and if so it is a common problem. I know one case where the heads had to be removed from the engine so the bits of plug jammed in the threads could be removed safely. It took two weeks and cost a small fortune. It's a problem when the plugs are left unchecked for so long; if they were more regularly removed and cleaned etc, it probably wouldn't happen. I agree it shouldn't happen, and you shouldn't be responsible if the plugs do break. You can fight Ford in the event they do, or maybe you could just leave the plugs alone.
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