QUOTE(wjang85 @ Mar 10 2019, 06:52 PM)
How sure r u that the sound is from engine knocking? Have u tried revving the engine while being stationary, to hear if there's any pinging noise?
I used to having this weird metallic pinging noise & i thought it was coming from the engine. Until 1 fine day, while trying to dampen some dashboard rattling sound, I removed the glove box & run my hand in it gently tapping around & found that 2 screws connecting between 2 parts of metallic sheets are not secured with nuts. Once i secured both screws with nuts, the metallic pinging noise is gone. That 2 sheets of metal parts are around the left side of the aircond blower. U can try to tap ur hand around that area.
If the noise is really caused by engine knocking, try a bottle or 2 of Techron Concentrate Plus from Caltex. Pour it into ur fuel tank when u refuel. It helps to remove carbon deposits from the fuel system & some of the engine parts. Caltex even produced this as OEM for BMW to clean carbon deposits. Same bottle design, same content, but relabeled it with BMW label. It costs RM46 per bottle. Nvr tried, nvr know...
confirm engine sound, not dashboard.. like previous posts mentioned, sound like old proton iswara/saga going up the hill.
it doesn't make that sound when stationary, only when there is heavy load onto the engine, like going up the hill at less than 2k RPM. but nowadays mine is bad that even flat surface it will make that sound.. to make the sound disappear, i have to pedal harder until RPM above 2k , but then the car will go faster when I dont want it to go faster like got traffic ahead or etc.
i haven't tried adding those stuff in, I heard its not good to add stuff into fuel, the engine oil in engine will become thick?