Anyone ever heard of a spark plug porcelin breaking off? I have now. Unfortunately, the shards may be stuck in the valves, causing no compression in the cylinder. Guess the heads have to come off...bummer.
It's a Bosch platinum plug, now missing the entire conical section of the porcelin. Any advice on dealing with the Bosch warranty deptartment?

 

First off, confirm that the plugs are listed for your truck. If they aren't, your done for.
Second, have the shop-or you-take pictures of the head when it comes off. I doubt that there are broken plugs floating around.

SL

 

If Bosch admits that their plug failed, they will likely replace it.

So much for the warranty.

Steve

 

I too have had the porcelain break off of a bosch platinum plug. In my case the broken piece never fell from the plug. Caused one nasty miss. installed new plug and took care of problem