240D Making 'Tic Tic Tic' Noises while running

[gdg9]

Hi, first post on the board. I have a 79 240D, 188k, Automatic, no problems. Just recently, about a month ago, had a valve adjustment.

Today while driving the car, things seemed very weak. At first I thought the car was in the wrong gear, but no, it was in drive. The car made a tinny sound, sort of tic tic tic, almost like a playing card on a bicycle. It was running underpowered, but the temperature never got above 90 on the thermometer. The oil was a bit low, and later on after it cooled down, I added another quart. Still, the tinny sound, every time I rev up and hit the accelerator. You could hear it echo down the street. I know this may not be the best description, but any thoughts?

Hopefully, if it sits a day or two, it will go away! And, BTW, nothing was leaking, smoking, or smelling, that I noticed. The car starts fine and it almost sounds like the noise is coming from the center of the car. THANKS!