D5 (D5244T to 2005) Vacuum line routing on D5? Schematics or pics?

[speedisgood]

Hi been.reading this very carefully as hoped one of you might help.Got a problem with the rear mount it seems as get a lot of noise and vibration when revs drop to about 1100 but only when driving slowly ,say in a traffic Que.Doesn't happen when driving normally.If I disconnect the rear mount problem solved but tickover choppy.Dealers changed vacuum mounts and updated software but stuck what to do next even technical were no help Really hoping you guys can help.Thanks

[v_matt_v]

Originally Posted by speedisgood

Hi been.reading this very carefully as hoped one of you might help.Got a problem with the rear mount it seems as get a lot of noise and vibration when revs drop to about 1100 but only when driving slowly ,say in a traffic Que.Doesn't happen when driving normally.If I disconnect the rear mount problem solved but tickover choppy.Dealers changed vacuum mounts and updated software but stuck what to do next even technical were no help Really hoping you guys can help.Thanks

Check if the engine pads solenoid operates properly - component 5 in here http://www.volvoforums.org.uk/showpo...84&postcount=3

At idle it should suck the air so if you stick your finger to the end of the hose disconnected from the T-piece (hoses going to the pads) you should feel vacuum. If the RPM increases above 1250 there should be no suction.

[speedisgood]

Thanks for that ,just tried it and works as you suggested,may be cuts in at 1100 ish if anything ie lower than 1250 if that makes a difference but definitely vacuum goes on lower revs and off higher than 1100,what d'you reckon??

[v_matt_v]

Originally Posted by speedisgood

Thanks for that ,just tried it and works as you suggested,may be cuts in at 1100 ish if anything ie lower than 1250 if that makes a difference but definitely vacuum goes on lower revs and off higher than 1100,what d'you reckon??

I wouldn't worry about the RPM as long as you feel that the vacuum appears and disappeares with certain RPM.
ok, next thing would be to check the vacuum engine pads.
1. Note how rough is the ride with both engine pads connected
2. Disconnect one of the from the T-piece and seal the disonnected T-piece end with a piece of blanked hose or a piece of rubber so there is no vacuum leak.
3. Go for a spin and compare if there is any difference with the engine roughness with the engine pad disconnected.
4. Move on to the second engine pads and repeat the above procedure.
5. If you don't seem much difference with the engine roughness with the disconnected engine pads then one of the is faulty.
6. Now you need a vacuum gauge to test which one is leaking.

Good luck

[speedisgood]

Thanks again,will hopefully get on it later tonight

[speedisgood]

Ok just spent a couple of hrs fiddling around and now confused.Did as you said with each tube.With either connected ,one at a time ,no noise at all or vibration .Engine. rougher though than with both connected but no difference that I could tell between the tthe front and back mount options .Tried different T piece thinking that may be a cause but same results.Has that made any sense???

[R-P]

The engine mounts shouldn't have anything to do with rough idling unless your vacuum circuit has an issue.

But even then...

Does your circuit hold its vacuum? Does it achieve enough vacuum?
iirc your turbo should have maximum vacuum at low revs, (the vanes are set by this vacuum to give maximum rotation of the turbo at low flow of exhaustgasses). But even if this fails, this shouldn't effect the idling-roughness I think... ?!!?

Just thinking out loud, I don't think I'm adding that much useful info...

[speedisgood]

Just seen your post.Sorry I didn't describe it properly.I should have said engine ticks over fine but vibrates more even when you just look at it .Also more steering column vibration when idling worse when the pump not connected . Would it be right that vacuum is too weak?? given only connected to one mount the noise I've been describing disappears??And if so is that software ?? No one seems to know not even.the dealers

[BigBas]

Could you plumb a boost gauge into any of these? Seen a few people tapping directly into the front of the EGR, which is neat, but I dont really fancy doing it tbh, would rather use the T piece in a vacuum/boost line. Sorry for going slightly off track!!

Kind regards,

Bas

[outnumbered]

no you can not take a feed from the vac line for boost
mike