Tapping Sound on Cold Start
#1
Senior Member
Thread Starter
Tapping Sound on Cold Start
Good day guys
Need some assistance here.
Only on cold start, I hear a rattling sound coming from the engine.
Once the engine is at optimum temperature, the noise is gone.
Is this normal or something to worry about?
Car is still under motorplan, so if it is an issue then I will send it off to Merc.
Thanx a mill
Need some assistance here.
Only on cold start, I hear a rattling sound coming from the engine.
Once the engine is at optimum temperature, the noise is gone.
Is this normal or something to worry about?
Car is still under motorplan, so if it is an issue then I will send it off to Merc.
Thanx a mill
#2
actually had the exact same thing. Noise only on cold cold start ups, gone when idle settles and regular or hard driving. Doesn't come from the engnie for me, more like mid-pipes. Thought it was a bad weld job or hole in the x-pipe/cat delete. Took it in and examined the underbody. Nothing loose nothing pierced. Could just be metal on metal contact due to the hard shaking of everything on a cold start up.
#4
MBWorld Fanatic!
#5
Super Member
Trending Topics
#10
Senior Member
Thread Starter
Hahahaha you guys
It is a ticking type of noise, once you give it a slight rev, the intervals between the tapping gets quicker
It is a ticking type of noise, once you give it a slight rev, the intervals between the tapping gets quicker
#12
Senior Member
Thread Starter
#14
Senior Member
Thread Starter
Yeah it does, but hate to hear that noise! Any remedy? I've been told to put Liqui Moly Ceratec with clean oil to eliminate the noise, so will try that soon
#15
Drive it every day and you won't get tapping
#16
MBWorld Fanatic!
This. The tapping only comes up if you don't drive your car for a long period of time.
It's not just temps. I store my cars for 6 months a year, and it always makes the noise on startup after such a long period of time without any run time. If you sit and idle it, it'll just tap away even at warm temps. You need to drive it a little, to get some real oil pressure into the system to get rid of the tapping. Typically, I fire up the car, let the idle drop to <1000rpm, then just drive at 20% throttle. Takes a block or 2 for the sound to go away.
I've owned 4 cars with the M156 and they all do this after not driving them for several weeks.
I've owned 4 cars with the M156 and they all do this after not driving them for several weeks.
#17
MBWorld Fanatic!
This. The tapping only comes up if you don't drive your car for a long period of time.
It's not just temps. I store my cars for 6 months a year, and it always makes the noise on startup after such a long period of time without any run time. If you sit and idle it, it'll just tap away even at warm temps. You need to drive it a little, to get some real oil pressure into the system to get rid of the tapping. Typically, I fire up the car, let the idle drop to <1000rpm, then just drive at 20% throttle. Takes a block or 2 for the sound to go away.
I've owned 4 cars with the M156 and they all do this after not driving them for several weeks.
It's not just temps. I store my cars for 6 months a year, and it always makes the noise on startup after such a long period of time without any run time. If you sit and idle it, it'll just tap away even at warm temps. You need to drive it a little, to get some real oil pressure into the system to get rid of the tapping. Typically, I fire up the car, let the idle drop to <1000rpm, then just drive at 20% throttle. Takes a block or 2 for the sound to go away.
I've owned 4 cars with the M156 and they all do this after not driving them for several weeks.
#18
MBWorld Fanatic!
^ You should use the 0w40 euro blend.
#20
MBWorld Fanatic!
yeah, I know...you actually told me this a couple of years ago, and i did have to have 2 cam adjusters replaced. this particular sound is the tick tick ticking, though, not the cam shaft rattle. although, I will say that the very first time I noticed the ticking sound, which was last week, I did get a brief cam shafty rattle (hasn't rattled since though).
#21
MBWorld Fanatic!