Yep I've tested continuity to coolant temp sensor :/

Today we're testing the ignition timing. My Dad reckons it is off when he had a quick look with a timing light yesterday. However we're being hampered in testing this because the area with the TDC markings on is damaged - half the readings are missing . The stud (for some sensor I can't remember which) is there but the TDC marking missing, it looks like it's shattered away!

How could the ignition timing be off, and what could cause that which I could investigate in the meantime?

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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