I am seeking assistance from anyone who can provide help.
I possess a 2006 E90 M47 that produces a ticking noise when the vehicle reaches optimal temperatures.
A few months ago, I operated my vehicle with low oil pressure, and a friend suggested that I might have caused low-end knock. However, after changing the oil and filter, we did not observe any metallic particles in the filter. Additionally, we placed four strong magnets underneath the oil during drainage and found no metal shavings. The ticking noise did not entirely correlate with the engine revs, leading us to conclude that it was due to chain slap. The vehicle just underwent maintenance, including the replacement of the timing chain, tensioner, water pump, steering pump, auxiliary belt, and all gaskets, approximately two weeks ago at a mileage of 165,000.
However, the noise persists. We have also eliminated lifter tick, as it is only audible from the bottom of the engine, predominantly on the driver's side, and cannot be detected with the hood open. I have included a link to my YouTube video at the end of this post. Thank you for your assistance; I recently spent £2,000 to eliminate this sound and was informed by the garage that it was chain slap, which is quite frustrating. To be fair, the car drives well and accelerates smoothly, but I detest this noise. The most accurate description of the ticking sound is that, while idling, it produces a characteristic diesel tractor "duhduhduh" noise, with the ticking occurring in varying rhythms such as "tick.......tick tick......tick tick tick tick.............tick." However, upon revving the engine, the ticking sound synchronises with the vehicle's operation.