2005 MCS 13000 miles
I visited dealer with what I thought was tappet noise, turned out to be valve to left of intercooler as suggested above, (something to do with fuel and emmisions).
If you put a big screwdriver on the valve or piece of tube the tapping resonates through it.
Also close your hand around valve and tapping noise gets quieter.
Other than that I saw a post on here a while back about faulty valve lifters which caused noise you describe.
Good luck. |