I own a 2004 Volvo XC90 T6 2.9L AWD with 6 cyl. (Twin turbo, with catalytic converter.)
While changing the spark plugs, one broke-off (all the ceramic below the threads and possibly the metal finger of the plug - I'm not sure) and fell through the valve, after bending it and causing the valve to burn (possibly). The cost to replace the engine or valve is huge! So I intend to drive the SUV back home (about 20 miles) and then replace the plugs with iridium NGK and drive it. I am hoping the spark plug piece that broke off will melt in the piston and not destroy the piston.
What do you think?
Can I drive the car or will it destroy the engine?
The spark plugs were less than 2 years old.