I have the same problem, and noticed many complaints at server also.
I don't remember Canyon had that problem when it was launched in 2011., so how did you manage to break a working thing and still not fix it ?

Also, the engine sound is waaay too quiet compared to the other ingame sounds, especially comparing it to TMNF engine sound.
I'm not impressed at all, I tried to come back to Canyon few days ago after a long pause, but with these huge sound problems also appearing in new Stadium now also, I don't see that coming so soon.