ccroy wrote:Different vehicle, but I had a spark plug blow out of the head of a Toyota PU.
A shop could tell right away if it's going to go. They ended up putting a helicoil or other threaded insert in the head without having to remove it.
This was in the 1980's and the shop said it was my fault for using cheap plugs (Champions) in an aluminum head. Went back to NGK's and never had a problem again.
I'd assume today with most heads being aluminum today spark plugs are made for them, but like anything thing else threads wear and/or get damaged.
I'd get it checked immediately if you think that's what it is especially if you can hear an air pumping sound near that plug. If that's what it is and you ignore it the plug with pop right out while you're driving! It's an ugly sound and you now have a poor running 3 cylinder engine!
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