When I took one of my "normal" cars in for the annual NY State
emissions inspection, my mechanic told me that sometime next year
they will start enforcing a limit on NOX emissions. He said that
older, high mileage cars generally have significant carbon buildup
and will, as a result, fail this test. The cure, he said, would
be an engine rebuild.
Since he mentioned a figure of about $2k, I suspect that he was
only talking about pulling the cylinder head and decarbonizing,
possibly with a valve job thrown in.
Does anyone have more specific facts on this?
Any suggestions for preventative maintenance?
Peter Schauss, Long Island, NY