Hmmm. Yep, you could have a carbon problem. I don't think low compression can cause nailing but I'm not 100% sure. The prechambers require 2 special tools to remove. The first is a "pin wrench" that you use to unscrew the lock ring that holds the prechamber in place. The second is an adapter that you screw into the prechamber itself, and attach to a slide hammer to yank it out of the head (may take lots of hammering).

The lowest price for the pin wrench, that I have found, is from Performance Produts at $63 plus S&H. I wouldn't attempt to make this tool. The slide hammer is nothing special, the best price for the hammer + adapter is at Baum Tools for $74. Or if you already have a slide hammer, you can buy the adapter only from Baum for $37. Prices are about a year old so they may have gone up a little bit.

Don't forget to remove the glow plug BEFORE attempting to remove the prechamber! Before all that, though, I'd remove the offending glow plug and see if it requires some force to remove (doen't fall out after you loosen it). If so, try reaming the glow plug hole first before pulling the p/c. You can isolate the cylinder by starting the car cold, and immediately loosening one metal injector line at a time... when the noise stops, that's the injector. Tighten the line again and the noise should come back. Make sense?

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