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My car is a '69 FI, MT Fastback. Just a few hundred miles ago I gave it the 3,000 mile tune-up, including valve adjustment. I've had the car about a year. The PO gave me receipts that show an engine rebuild about 20k miles ago. My daily drive includes a few long, steep hills that I normally travel at around 30-35 mph in 3rd gear at medium RPM. It's a good load on the engine, and I often slow down and move to 2nd gear to avoid lugging the engine. In the last couple of days I have noticed the *tok* *tok* *tok* sound when the engine is under this load. It goes away or lessens if I slow down and shift into 2nd gear. I don't think this is the pinging that is normally associated with timing or gas of too low octane. Does not have that high-frequency ballsy sound that I've heard before. This is definitely a lower frequency *toc* sound. I don't hear anything like this at idle or at freeway cruising speeds. Just under heavy load going uphill. Maybe I'm a worry-wort... But is there some preventative maintenance I should look into right away? Or am I just being silly? -Mark Fuhriman ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org