neilz
MB Enthusiast
- Joined
- Nov 14, 2009
- Messages
- 1,533
- Location
- London
- Car
- W140 S320L, 1997, Black with Black Bird's Eye Maple trim
I have two engine faults I have no idea about
1) Often makes tapping sounds when starts for first 5 seconds (not tappets) and when the car starts and the engine revs a tiny bit up for a second or two (as usual on a car?) it is accompanied by a fast soft tapping
2) Makes tapping sound like diesel when idling after over 30 mins of driving (urban and extraurban)
My car has the M111.960 engine and is an E220 coupe from '95 (W124). It's not the tappets and carbon buildup has been suggested, I can tell you that the wiring harness has chosen to return to nature, eagerly degrading, which could explain why it sometimes revs up to 1600-1800 when idling for no apparent reason (otherwise it has a very slightly juddery idle)
I've noticed also that my car picks up quite slowly in first then either changes to second with a small lurch forwards or changes smoothly but makes a plastic scraping (or coarse rattling, ever heard one of those newish Land Rover Defenders which sounds like that as standard? You'll know what I mean if you have) sound in second which slowly fades away as the engine noise takes over. The engine is raspy but that's how I expect it to be I guess. Ideas?
Thanks for any help!
1) Often makes tapping sounds when starts for first 5 seconds (not tappets) and when the car starts and the engine revs a tiny bit up for a second or two (as usual on a car?) it is accompanied by a fast soft tapping
2) Makes tapping sound like diesel when idling after over 30 mins of driving (urban and extraurban)
My car has the M111.960 engine and is an E220 coupe from '95 (W124). It's not the tappets and carbon buildup has been suggested, I can tell you that the wiring harness has chosen to return to nature, eagerly degrading, which could explain why it sometimes revs up to 1600-1800 when idling for no apparent reason (otherwise it has a very slightly juddery idle)
I've noticed also that my car picks up quite slowly in first then either changes to second with a small lurch forwards or changes smoothly but makes a plastic scraping (or coarse rattling, ever heard one of those newish Land Rover Defenders which sounds like that as standard? You'll know what I mean if you have) sound in second which slowly fades away as the engine noise takes over. The engine is raspy but that's how I expect it to be I guess. Ideas?
Thanks for any help!
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