The cam tensioners were light beige to brown plastic not green on my '98 base. I did have green camshaft end plugs, so it could be that someone in the past popped one (or part of one) into your cam cover when removing them.
I would suggest using a magnet to see if the apparent metal particles are steel. That's a bigger issue if they are. If they are aluminum, one of your tensioners may be bad causing a timing chain to scrape the casing. This will throw a code, if it is the problem. You can take off the cam covers without removing the engine and replace the cam tensioners if that's what is bad.
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