D5 "Dump Valve Sound" / Slow Turbo Response Cure

[hobbyhorse]

I've taken one of these valves apart & had a good look. The valve is actually a fast acting solenoid that controls the vacuum by pulsation; the filter is on the atmospheric side of the diaphragm valve - any crud on the filter damps the action of the diaphragm, hence the overboost problems. The 2 pipes are isolated from the filter by the diaphragm - if you spray cleaner into the pipes you might perforate the diaphragm; carefully remove the filter matrix using a sharp stanley blade ( it's glued on ), clean it then super glue it back on for a perfect fix. You could also just probably sling the filter & deploy a section from some nylon tights & a cable tie

[Lukesmadhouse]

Well all done and road test complete

Results are mixed it seems more responsive low down in the rev range upto 2000 as previously until 2000 it took a while to get anywhere almost like it was holding back.

Now though around 2300 the is definately a louder 'dump valve sound' tiny hesitation then pulls strong again which wasn't there before so as the valve was definately blocked i'm wondering if a) due to the correct valve operating ive got a split pipe or b) the diaprham in the valve is knackered.

Any ideas are welcome

cheers

[princepugh]

Thank your lucky stars you oil burners get a filter, the TCV on the petrol turbos runs dirty, once it starts playing up thats it, new part please Mr Volvo.

http://www.volvoforums.org.uk/blog.php?b=604

[jannne]

Hey, a new member here. I found this thread via Google searching for my symptoms - 'dump' sound, whistling etc. Sometimes while accelerating it feels as if everything starts okay but then slows down a bit (maybe due to overboosting described in this thread) and then goes again. I don't know if I have any DTCs on the engine control module, If I do then they are not severe enough to be reported via DIM.

I took out the governor valve to clean it. I also tested the vacuum tubes - they were ok. On the valve I saw markings both on the valve and one vac tube, so clearly someone had previously taken the thing off and put it on again. I sprayed the mesh with carb cleaner but it seems that it was pretty blocked. Holding the valve against light I saw that some of the cleaner fluid made it behind the mesh but would not drip through it on its own. I suppose if fluid does not penetrate the mesh well, neither does air.

One question though - If i blow in both the vac and out ports at the same time (or block the other while blowing), should air come through the mesh? The reason for this question is that when I did so, I clearly heard the sound of the mesh bulging outwards (and eventually getting the carb cleaner fluid through the mesh).

Test drive showed the following results: dump noise still present, acceleration about the same as before. Is there any way to monitor the boost and other sensor values via OBDII as I don't want to get into the hassles of a dedicated boost gauge?

On a side note - I was disappointed to see how much crud was in the inlet piping walls, thanks to the EGR.

[woodyG]

Great information, I am new to the forum and would appreciate a little help if any one could.
I had the "time for regular service" message on constantly on my 2003 D5 and limp mode activated and had feed back from the local volvo deal that its ether the TCV or the turbo that needs replacing with a price range of £350 to £1400.

After reading the threads on what it could be and buying my own OBD2 reader, I cleaned the TCV filter as how to in this thread look like it needed the clean.

I now have the time for regular service only on for a short time when first driving off and then it clears, I have no limp mode activated but I do get a noise from the turbo at lower revs but goes once above 2500revs, the noise is like a ambulance siren in the distance and the fault code is P0244. Would appreciate a pointer in the right direction to check things out many thanks.

[Simon Jones]

I think the 'time for regular service' means exactly that: oils, filters etc. What I think you're getting is 'engine service required' which is often caused by failed intercooler, broken swirl arm, gunged up inlet system etc.

[outnumbered]

Originally Posted by woodyG

Great information, I am new to the forum and would appreciate a little help if any one could.
I had the "time for regular service" message on constantly on my 2003 D5 and limp mode activated and had feed back from the local volvo deal that its ether the TCV or the turbo that needs replacing with a price range of £350 to £1400.

After reading the threads on what it could be and buying my own OBD2 reader, I cleaned the TCV filter as how to in this thread look like it needed the clean.

I now have the time for regular service only on for a short time when first driving off and then it clears, I have no limp mode activated but I do get a noise from the turbo at lower revs but goes once above 2500revs, the noise is like a ambulance siren in the distance and the fault code is P0244. Would appreciate a pointer in the right direction to check things out many thanks.

the code you have is ECM 6805
have a look at this it sounds like the vanes are sticking on the turbo there is a how to on this thread to clean them but read all of it.
http://www.volvoforums.org.uk/showthread.php?t=132443
mike

[Farmer Tim]

Is there something like this on the electrical adjusted VVT?

[LJD]

Just did mine . about 15 mins all in . then another 5 mins washing oil off forearms after they got oil from the intercooler pipes on them.

as above, only remove the top bolt. pipes on mine are easy to work out. getting it wrong would mean your a idiot !

very very little dirt .In fact almost nothing

worth doing just for peace of mind

[LJD]

Might be a "Snake oil effect" but i did notice a difference today

trying to describe it is hard. lets call it "smoother" on acceleration