I noticed a knocking noise on my Ford Focus 1.8tdci 74kw from 2004. The car is old, so it might be the end for it. Nevertheless, I would like to diagnose the problem if possible. You can hear the noise here.
The knock comes from the accessory belt side of the engine. I don't think it comes from a pulley, since the noise is there with the belt off. The noise goes away after 2000rpm. It seems to me like a chirping sound is audible at 2000 rpm, not at the same frequency as the motor rpm.
Also the noise is not present when the car is not in load (when decelerating with the gas pedal lifted). No error codes are present, no smoke, no vibrations, the car was never low on oil. I did not feel any loss of power.
I am thinking:
- chain? the sound is not a rattle. It's like two pieces of metal knocking.
- injectors? I heard bad injectors can give engine knocking
- rod knocking? The car doesn't sound as bad as cars having this issue on youtube.
- exhaust leak?
Thanks in advance.