I also have been using 2014 model, using since 2016, bought at 9000 KM now at 33000 KM, 1st owner, everything was fine until it just started giving knocking sound in the beginning/startup and gets disappeared in couple of minutes. Even if I start car again in couple of hours sound will not come. Usually it comes in the morning or after a long interval stop (hrs). I have changed the fuel full high Octane, from Shell, from PSO etc.
Shall I go for throttle cleaning? I used to have throttle cleaned, but this time my mechanic didn't, but yes I changed plug this time and 1st time switched to Liqui Moly 5W-30.
Any suggestions?