I own a 420 SEC (W 126) form 9-1989 (120000 km); some time ago I noticed a ticking noise at the right side of the right cylinder block,with the engine idling (tapping valves??).
The normal idling speed is irregular (like stumbling/misfiring)and it seems to me the fuel consumption has slightly increased lately....
The MB dealer supposes a malfunction of the valve tappets and/or rockers which need to be replaced, maybe the camshaft as well...!?
Has anyone experienced the same problem ? If so, please let me know what the diagnosis was....
Thanks in advance,
[This message has been edited by cremer (edited 04-11-2000).]