So my 2006 Mustang GT came back from the shop, where they said they’d checked spark plugs and found the bottom of the wells very greasy. Last weekend, I pulled off the coils and the boots and cleaned it out. That’s when I noticed that all but two of the threads in the housing for the coil retaining bolts had been stripped or nearly so (Thank you very much Ford dealership! Though, to be fair, I’d notice that, despite tightening them finger tight when I’d removed them to change the plugs months ago, they were already showing some give.).
So, a couple of/three questions:
- Am I right in thinking that these bolts, the ones retaining the coil, are 10-32s in diameter/thread count?
- Has anybody repaired their stripped threads using inserts, and how’d that turn out?
- Any other recommended methods of repair?