My car has just started to make these weird knocking sounds. What is it trying to tell me? Check the video at 0:19 and 0:27.
It's only hearable at cold starts, and just when the revs drop from about 1200 to 900. It sounds like it's coming from somewhere below... There is a few knocks and after that it's "quiet". There is no other strange noises, vibrations or warning lights.
I've had the car for six years and it has 34000 miles on the clock. Oil and filter is changed every 3-4k miles. Its never been tracked and I have never ever redlined it.
I hope its just something like carbon buildup, but if someone knows, have an idea, hunch or comment about this, feel free to chime in!
Enjoy video (or not):