C450 engine idle
#2
MBWorld Fanatic!
Mine has a faint ticking noise that you can hear from inside the cabin also.. I can't really hear it on the outside though.. I think it may be the direct injection but I'm not sure.. Does anyone else have the faint ticking noise inside the cabin on a c450?
#4
Kinda on the same topic, but what do your cars (450's) idle at once they are warmed up? Mine sits around 500RPM. Before break in, it was at about 650 or 700. Curious about others.
#7
Mine also has a very faint ticking noise that I can hear when outside of my car. From everything I've read and heard it is normal. I'm coming up on 3k miles and I will say it gets quieter as it breaks in.
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#8
MBWorld Fanatic!
I can't really hear the ticking from outside... It's mostly from inside the cabin..
#19
#20
Super Moderator
Spot on. There are two things that tick. Amplifier DI injectors & the slight diesel sounding combustion process & the EECS purge valve.