D5 (2005 on) - Slow dropping engine revs?

Sen1977 · Aug 29th, 2018, 19:36

Hi Guys,

I have a 55 plate 2005 D5 185, recently I have been hearing what sounds like a noisy camshaft under acceleration, but not at idle, or off throttle, it has me baffled, I am pretty sure this is not a camshaft noise.
Today I noticed that if I come off full throttle and depress the clutch the revs hover and drop slowly, this doesn't happen when the engine is free rev'd it responds as it should smoothly up and down.

Could anyone help me with this? I am feeling its more fuel orientated but I do not know in what way.

Thanks Scott

AndyV7o · Aug 29th, 2018, 19:38

Could well be the DMF...

Sen1977 · Aug 29th, 2018, 19:44

I hope it can't be, all replaced last week after the slave cylinder seal went, full lot done, slave, clutch, dmf.

AndyV7o · Aug 29th, 2018, 19:50

Ooh! Yes, one would hope not in that case!
However it does beg the question, did this occur after or before the clutch work?

Sen1977 · Aug 29th, 2018, 19:59

Can't say I noticed it, but, I wasn't looking, now I'm worried, I have invested a lot of money in this car and it isn't going to last and give me back my return.
I am sure the 'cam' noise wasn't there. It would growl. but no noticeable rattles, off throttle it is whisper quiet.

AndyV7o · Aug 29th, 2018, 20:22

If in any doubt, and you had it done at a garage, they and the parts warranty should cover any issues, if there are issues of course... Was it volvo who did it? If not were they quality parts?
Of course this is based on one hasty suggestion, it could be way off the mark. I posed the question as I have experienced dmf equipped cars having a slow rpm drop, or brief increase, when changing gears, and, dmf's can make funny rattles/noises/vibrations which can be mis-diagnosed as other things. Hopefully this is the opposite, something else giving symptoms similar to a dmf!

Sen1977 · Aug 29th, 2018, 20:36

No, it wasn't Volvo, it nearly broke me as it is using an independent, I trust the lads who did the work, the parts will be good, LUK, I believe, and I know they will have done it right.
Thanks for your help, fingers crossed it isn't something really major as my pocket can't take anymore.

AndyV7o · Aug 29th, 2018, 20:48

Yeah LUK should be ok.
Other things to check, aux belt tensioners, alternator pulley, etc, It could simply be you've developed a lazy tappet, or, it could be, thinking-on a bit to recent personal experience, an injector seal. If a seal goes it sounds just like a tappet, I thought for a long while my scenic had developed a lazy tappet, until I started getting fumes in the cabin when car at rest. I could hear that the 'tappet' noise had become more 'fluffy' sounding like a cracked manifold or leaking gasket. The sound came from the front not back of the engine though, and once I took the plastic engine cover off & checked injectors, there it was, no.3 all black and oily, chuffing away....
Luckily injector seals arent (usually) expensive or difficult to sort, you could do it yourself. Check out SiRobb on youtube, couple of vids on the D5 injectors/seals

Sen1977 · Aug 29th, 2018, 21:52

I have heard an occasional chuff when cold, and funnily enough I have just been watching SiRobb's channel, which inspired me to go out and have a good look at the injectors. They are ALL clean, no black at all, tho it appears someone prior to me has ventured in as one of the bolts on an injector is cocked over and it appears to not have gone in straight. Hoping this is not my culprit as removal could be difficult.
If it was a lazy tappet would it also be audible on idle and also when the engine was free of throttle input, off throttle coast?
The performance is still really strong, pulls like a train, only rattly now, just worried about doing harm to a good motor.
I also noted a leaking engine mount vacuum also. clamped the offending mounts pipe with some mole grips to see if that improves anything.

AndyV7o · Aug 29th, 2018, 22:01

This might interest you perhaps, if it is a tappet https://www.volvoforums.org.uk/showthread.php?t=283172
Tappets can rattle at certain engine speeds, loads, etc, not always constant. Wouldn't cause the rpm issue though...
The noise could be exhaust manifold or gasket too.
You may have two things occurring, the rpm drop might just be the new dmf being all tight, whilst the noise could be un-associated.

Aug 29th, 2018, 19:36	#1
Sen1977 New Member Last Online: Mar 14th, 2022 16:12 Join Date: Aug 2018 Location: KETTERING	Slow dropping engine revs? Hi Guys, I have a 55 plate 2005 D5 185, recently I have been hearing what sounds like a noisy camshaft under acceleration, but not at idle, or off throttle, it has me baffled, I am pretty sure this is not a camshaft noise. Today I noticed that if I come off full throttle and depress the clutch the revs hover and drop slowly, this doesn't happen when the engine is free rev'd it responds as it should smoothly up and down. Could anyone help me with this? I am feeling its more fuel orientated but I do not know in what way. Thanks Scott

Aug 29th, 2018, 22:01	#10
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	This might interest you perhaps, if it is a tappet https://www.volvoforums.org.uk/showthread.php?t=283172 Tappets can rattle at certain engine speeds, loads, etc, not always constant. Wouldn't cause the rpm issue though... The noise could be exhaust manifold or gasket too. You may have two things occurring, the rpm drop might just be the new dmf being all tight, whilst the noise could be un-associated. Last edited by AndyV7o; Aug 29th, 2018 at 22:05.

Aug 29th, 2018, 19:38	#2
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Could well be the DMF...

Aug 29th, 2018, 19:44	#3
Sen1977 New Member Last Online: Mar 14th, 2022 16:12 Join Date: Aug 2018 Location: KETTERING	I hope it can't be, all replaced last week after the slave cylinder seal went, full lot done, slave, clutch, dmf.

Aug 29th, 2018, 19:50	#4
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Ooh! Yes, one would hope not in that case! However it does beg the question, did this occur after or before the clutch work?

Aug 29th, 2018, 19:59	#5
Sen1977 New Member Last Online: Mar 14th, 2022 16:12 Join Date: Aug 2018 Location: KETTERING	Can't say I noticed it, but, I wasn't looking, now I'm worried, I have invested a lot of money in this car and it isn't going to last and give me back my return. I am sure the 'cam' noise wasn't there. It would growl. but no noticeable rattles, off throttle it is whisper quiet.

Aug 29th, 2018, 20:22	#6
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	If in any doubt, and you had it done at a garage, they and the parts warranty should cover any issues, if there are issues of course... Was it volvo who did it? If not were they quality parts? Of course this is based on one hasty suggestion, it could be way off the mark. I posed the question as I have experienced dmf equipped cars having a slow rpm drop, or brief increase, when changing gears, and, dmf's can make funny rattles/noises/vibrations which can be mis-diagnosed as other things. Hopefully this is the opposite, something else giving symptoms similar to a dmf!

Aug 29th, 2018, 20:36	#7
Sen1977 New Member Last Online: Mar 14th, 2022 16:12 Join Date: Aug 2018 Location: KETTERING	No, it wasn't Volvo, it nearly broke me as it is using an independent, I trust the lads who did the work, the parts will be good, LUK, I believe, and I know they will have done it right. Thanks for your help, fingers crossed it isn't something really major as my pocket can't take anymore.

Aug 29th, 2018, 20:48	#8
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Yeah LUK should be ok. Other things to check, aux belt tensioners, alternator pulley, etc, It could simply be you've developed a lazy tappet, or, it could be, thinking-on a bit to recent personal experience, an injector seal. If a seal goes it sounds just like a tappet, I thought for a long while my scenic had developed a lazy tappet, until I started getting fumes in the cabin when car at rest. I could hear that the 'tappet' noise had become more 'fluffy' sounding like a cracked manifold or leaking gasket. The sound came from the front not back of the engine though, and once I took the plastic engine cover off & checked injectors, there it was, no.3 all black and oily, chuffing away.... Luckily injector seals arent (usually) expensive or difficult to sort, you could do it yourself. Check out SiRobb on youtube, couple of vids on the D5 injectors/seals

Aug 29th, 2018, 21:52	#9
Sen1977 New Member Last Online: Mar 14th, 2022 16:12 Join Date: Aug 2018 Location: KETTERING	I have heard an occasional chuff when cold, and funnily enough I have just been watching SiRobb's channel, which inspired me to go out and have a good look at the injectors. They are ALL clean, no black at all, tho it appears someone prior to me has ventured in as one of the bolts on an injector is cocked over and it appears to not have gone in straight. Hoping this is not my culprit as removal could be difficult. If it was a lazy tappet would it also be audible on idle and also when the engine was free of throttle input, off throttle coast? The performance is still really strong, pulls like a train, only rattly now, just worried about doing harm to a good motor. I also noted a leaking engine mount vacuum also. clamped the offending mounts pipe with some mole grips to see if that improves anything.

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