There's only a knock sensor on the 16v - I think the 8v's are KE-Jetronic... not definite, but even so I'm quite sure there's no knock sensor on the 2.0 and 2.3 8 valve engine.

later!

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg