on Saturday. One thing I did notice, you have to push those metal "cover" onto the plug firmly until you hear a pop. When I was taking them off, one by one and changin' the plugs one by one. I noticed some of them were loose. the ones that were seated correctly, I had to tug on to get off. Don't know if this has anything at all to do with what happened to your plug. The old plug were actually in pretty good shaped, carboned up, as the car had only be driven 5K in the last 15 years, I probably cound have gotten away with cleaning them, but decided on new ones. After the job was done, I noticed the idle is no very smooth, before, there was a skip now and then. Also, this morning the engine fired up instantly, no cranking at all.

But as other posters have written I have never seen a plug blow up like this. The one thing I can think of is somehow the plug might have been loose and each compression stroke might have loosened it enough to blow out the plug? But this is just a thought and I don't know if this is even possible? Has the ar been running OK?

__________________
Al Lueb
1999 C280 54K miles
1979 450 SLC 144K miles