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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Vacuum line routing on D5? Schematics or pics?Views : 54911 Replies : 20Users Viewing This Thread : |
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May 1st, 2011, 22:42 | #11 |
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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
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May 1st, 2011, 23:29 | #12 | |
Volvo Fan
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Quote:
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. |
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May 2nd, 2011, 10:19 | #13 |
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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??
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May 2nd, 2011, 17:04 | #14 | |
Volvo Fan
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Quote:
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 |
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May 3rd, 2011, 07:29 | #15 |
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Thanks again,will hopefully get on it later tonight
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May 3rd, 2011, 20:08 | #16 |
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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???
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May 10th, 2011, 19:04 | #17 |
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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... |
May 10th, 2011, 20:04 | #18 |
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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
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Mar 2nd, 2012, 13:10 | #19 |
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Last Online: May 1st, 2013 15:10
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Location: Dewsbury
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Boost gauge
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
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Mar 2nd, 2012, 13:18 | #20 |
Lunatic from Wakefield
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no you can not take a feed from the vac line for boost
mike
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