gromlog Posted May 28, 2021 Share Posted May 28, 2021 Hello, I'm looking for ideas till I find some time to get to the mechanic. Curiosity and all... Basically when my car is just started it's making really loud tractor kind of noise more like tapping I don't think I know how to describe it, but if I rev engine up, the sound kind of goes away at around 2k rpm, well most likely, because it's covered by the burning petrol sounds. When engine gets to it's normal working temperature it turns into really silent diesel engine alike ticking sound, revving the engine up then it really kills it as if everything's ok. I do have a code for NOx sensor (VCDS advises to replace NOx sensor) And Incorrect flow at EVAP system By any chance there are known cases, that one of them could cause this ? could it do some engine damage ? When I just bought the car it was very silent, as if it had start/stop system, but it doesn't. I think issue is more noticeable from inside the car, than outside. Car: a3 8p 2.0 fsi petrol, thoughts ? Quote Link to comment Share on other sites More sharing options...
Stevey Y Posted May 28, 2021 Share Posted May 28, 2021 Hi I think you must be referring to the oxygen sensor this and the EVAP canister would cause the symptoms you describe, change them and it should cure your problems. Steve. Quote Link to comment Share on other sites More sharing options...
gromlog Posted May 28, 2021 Author Share Posted May 28, 2021 Hopefully, well, thanks. Quote Link to comment Share on other sites More sharing options...
A3_Ben Posted May 30, 2021 Share Posted May 30, 2021 I have the same noise when I first start it up occasionally it’s really weird Quote Link to comment Share on other sites More sharing options...
gromlog Posted June 13, 2021 Author Share Posted June 13, 2021 I'm still going to the mechanic on wednesday, but if anyone curious I'm almost 100% certain, that it's cam chain. Some symptoms are very accurate, and using flat screwdriver it seems, that the noise is coming exactly from where the cam is. Quote Link to comment Share on other sites More sharing options...
gromlog Posted June 16, 2021 Author Share Posted June 16, 2021 Yup tensioner failed. Quote Link to comment Share on other sites More sharing options...
cliffcoggin Posted June 16, 2021 Share Posted June 16, 2021 41 minutes ago, gromlog said: Yup tensioner failed. Glad you found the fault. The screwdriver stethoscope is always my first choice for diagnosing odd noises, though a proper mechanics stethoscope is easier on the ears and skull. Quote Link to comment Share on other sites More sharing options...
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