Engine Clicking/Tapping Sound at Idle

32927 Views 23 Replies 16 Participants Last post by Andrews413, May 13, 2021

C-Class

Discussion Starter · Jun 7, 2005

Has anyone ever experienced this issue? At idle, I can hear a faint but distinct "clicking" sound coming from the passenger side of the engine. With the hood closed, I hear the noise coming from the pasenger-side front wheelwell. I hear this noise while the car is not moving. The frequency of the clicking increases with RPM. I do not hear this noise under acceleration (probably because it is so faint).

If anyone else has experienced this, have you addressed the issue with your dealer and, if so, what did they say?

Save

1 - 4 of 24 Posts

vvv90

· #5 · Jun 7, 2005

It's the injectors.

It's normal.

Save

vvv90

· #7 · Jun 7, 2005

C-Class said:
Thanks all...I read on the LX forum mention of using Mobil 1 to make the clicking go away too.

No amount of oil is going to do anything about injector noise.

As far as the theory being the lifters? Considering they're rollerized, ramped cam profile I'll bet and hydraulic. I dought it's the valve train.

But let me ask you a qustion.

Is the ticking so faint that you actually need to be really close to the engine? and if so, is it a rapid ticking? It's not:

tick......tick......tick......tick......

But more.

tictictictictictictictictictic

But faint and pretty much goes away when accelerator is pressed (due to engine noise)

I still think it's just the normal operation of the solenoids in the injectors.

See less See more