d215yq
Senior Member
- Joined
- Mar 28, 2008
- Messages
- 2,664
- Reaction score
- 702
- Age
- 39
- Location
- Valencia, Spain
- Your Mercedes
- 1987 W124 300D 280k miles
Just changed the oil/filter on my car - after 20k (motorway) miles and 13 months.. yes I'll do it earlier next time if ti lasts that long! It's noticably quieter and smoother at idle/through most of the rev range but also seems to miss a bit/vibrate a bit more at 1.1k rpm/2.2 k rpm even when in neutral. It's only these two points in the rev range it's apparent. Now it's always given off noises/vibrations/judder, particularly at 1100rpm in any gear but also a little in 2200 rpm in any gear, but I've done nearly 100k miles like this and just assumed it's broken Anti-Jerk/warn drivetrain/badly balanced camshaft balcancer etc and in short too complicated to fix (as all garages its been to have also thought) It's not really a bother as 99% of the time in the car is cruising outside these ranges.
But now since the oil change/I put in the injector cleaner I've noticed it a lot more when just revving it in neutral, it's like in constant state the car is perfectly firing/not missing but as it accelerates/decelerates through those ranges the whole engine shakes a little and misses for just a split second, enough to shake the car. But at a constant 2300rpm or idle at 700 rpm is perfectly smooth - crusing outside 1100rpm/2200rpm - so in 5th gear 40 to 50mph or 55 - 80mph the car is super smooth too, just a little vibration at 2200rpm and some transmission noises at 1100rpm...but that has always been the case. Also, although the idle seems smoother it also seems more delicate - lifting the clutch a bit soon or the fan cutting in seem to make it fluctuate/make a noise like it wants to stall more than before, where it would just carry on and was practically impossible to stall the car in first gear no matter how quick clutch was released and when the fan cutting in did not effect idle speed at all.
Perhaps I notice because the car is smoother in general, or perhaps because I've been doing more research on how old diesles work and looking for more specific things. Or could it be the injector cleaner is affecting stuff? To ensure good emissions for the yearly test I usually just fill with 50% sunflower oil but this time I went for the injector cleaner as I've got a 4k mile roadtrip starting thursday and want it running the best it can.
As an aside (just for reference in future) does anyone pre fill the oil filter doing a change? I've never done that and notice it takes a good 10-15 seconds (of slight metallic noise) to get oil pressure after a change (normally it's instant upon starting ) and I know fuel filters are pre-filled so maybe I've been doing it wrong not pre filling it as i think the filter takes around 1/2 litre of oil??
But now since the oil change/I put in the injector cleaner I've noticed it a lot more when just revving it in neutral, it's like in constant state the car is perfectly firing/not missing but as it accelerates/decelerates through those ranges the whole engine shakes a little and misses for just a split second, enough to shake the car. But at a constant 2300rpm or idle at 700 rpm is perfectly smooth - crusing outside 1100rpm/2200rpm - so in 5th gear 40 to 50mph or 55 - 80mph the car is super smooth too, just a little vibration at 2200rpm and some transmission noises at 1100rpm...but that has always been the case. Also, although the idle seems smoother it also seems more delicate - lifting the clutch a bit soon or the fan cutting in seem to make it fluctuate/make a noise like it wants to stall more than before, where it would just carry on and was practically impossible to stall the car in first gear no matter how quick clutch was released and when the fan cutting in did not effect idle speed at all.
Perhaps I notice because the car is smoother in general, or perhaps because I've been doing more research on how old diesles work and looking for more specific things. Or could it be the injector cleaner is affecting stuff? To ensure good emissions for the yearly test I usually just fill with 50% sunflower oil but this time I went for the injector cleaner as I've got a 4k mile roadtrip starting thursday and want it running the best it can.
As an aside (just for reference in future) does anyone pre fill the oil filter doing a change? I've never done that and notice it takes a good 10-15 seconds (of slight metallic noise) to get oil pressure after a change (normally it's instant upon starting ) and I know fuel filters are pre-filled so maybe I've been doing it wrong not pre filling it as i think the filter takes around 1/2 litre of oil??