Engine: D52447: - Turbo 'Hiss'

TheScrew1972 · Dec 22nd, 2013, 22:36

Evening all,

I'm here again to pick your brains. My question this time relates to the turbo on my 2004 53 plate D5 SE. Is it normal to hear a 'hiss' from the turbo when easing off the accelerator after acceleration? Quite faint but definitely there. The engine has also started to sound 'raspy' under acceleration, and MPG has dropped along with a slight loss in power.

Should I be worried? Any suggestions as to what the cause may be?

Thanks in advance.

Mike

Shadeyman · Dec 22nd, 2013, 23:23

Could be you hav a leak and are loosing boost, a split hose perhaps ...

TheScrew1972 · Dec 24th, 2013, 18:44

Had a bit of a look around at the pipes from the air box to the turbo and found a 'loose' connector between two pipes (circled in red on picture below)

I can twist the connector (when taking hold of the pipe) from side to side and there is a little up and downwards play too.

Is this normal? What is the connector? (Has an electrical connection to it)

Sorry about the picture but posting in work so do not have the best software / system to work with

Turdo Pipe.JPG

Once again, thanks in advance

Shadeyman · Dec 25th, 2013, 01:05

The pipes from the airbox to the turbo aren't under pressure so I doubt a leak here would be loud enough to produce the hiss you describe. The pipes after the turbo, to the inlet manifold are under pressure and are far more likely to be the source of the hiss.

However, I think the part your refering to is called a "nipple"(part number:8653644) in VIDA and is where the engine breather connects to the intake.

NCS XC90 · Dec 27th, 2013, 19:28

Any change in colour of exhaust gasses? I get a slight hiss from the turbo generally but I'm just thinking the hiss could be a blown intercooler (air escaping from the intercooler) in which case you would normally see black smoke on hard acceleration. When it goes you do get less power and less MPG. I've the same age car and the intercooler is a common issue. It tends to go at the top of the intercooler in the midpoint between the inlet and outlet. If it’s gone you will see it’s bowed up at this point and there will be oily residue around that point. Other than this, it’s a case of check pipe work as you are doing looking holes unless someone knows anything more likely.
Neil

TheScrew1972 · Dec 27th, 2013, 20:09

Haven't noticed any change in smoke (either colour or amount produced). I have been told that it is sucking in air through the filter box lid, which has a broken lug and so does not seal properly due to being 'bowed' inwards in the middle.

Had to order a full box from the main dealers, £160, as couldn't source one from a breakers.

Had a read of this thread:

http://www.volvoforums.org.uk/showth...=69443&page=12

and got me wondering just how soft is too soft, and how hard should the pipe be?

Mike

Dec 22nd, 2013, 22:36	#1
TheScrew1972 Senior Member Last Online: Jun 21st, 2024 21:00 Join Date: May 2011 Location: My Own Little World	Turbo 'Hiss' Evening all, I'm here again to pick your brains. My question this time relates to the turbo on my 2004 53 plate D5 SE. Is it normal to hear a 'hiss' from the turbo when easing off the accelerator after acceleration? Quite faint but definitely there. The engine has also started to sound 'raspy' under acceleration, and MPG has dropped along with a slight loss in power. Should I be worried? Any suggestions as to what the cause may be? Thanks in advance. Mike

Dec 22nd, 2013, 23:23	#2
Shadeyman VOC Member Last Online: May 28th, 2020 23:57 Join Date: Jun 2012 Location: Wolverhampton	Could be you hav a leak and are loosing boost, a split hose perhaps ...

Dec 24th, 2013, 18:44	#3
TheScrew1972 Senior Member Last Online: Jun 21st, 2024 21:00 Join Date: May 2011 Location: My Own Little World	Had a bit of a look around at the pipes from the air box to the turbo and found a 'loose' connector between two pipes (circled in red on picture below) I can twist the connector (when taking hold of the pipe) from side to side and there is a little up and downwards play too. Is this normal? What is the connector? (Has an electrical connection to it) Sorry about the picture but posting in work so do not have the best software / system to work with Turdo Pipe.JPG Once again, thanks in advance

Dec 25th, 2013, 01:05	#4
Shadeyman VOC Member Last Online: May 28th, 2020 23:57 Join Date: Jun 2012 Location: Wolverhampton	The pipes from the airbox to the turbo aren't under pressure so I doubt a leak here would be loud enough to produce the hiss you describe. The pipes after the turbo, to the inlet manifold are under pressure and are far more likely to be the source of the hiss. However, I think the part your refering to is called a "nipple"(part number:8653644) in VIDA and is where the engine breather connects to the intake.

Dec 27th, 2013, 19:28	#5
NCS XC90 Member Last Online: Oct 15th, 2018 21:19 Join Date: Nov 2008 Location: Warrington	Any change in colour of exhaust gasses? I get a slight hiss from the turbo generally but I'm just thinking the hiss could be a blown intercooler (air escaping from the intercooler) in which case you would normally see black smoke on hard acceleration. When it goes you do get less power and less MPG. I've the same age car and the intercooler is a common issue. It tends to go at the top of the intercooler in the midpoint between the inlet and outlet. If it’s gone you will see it’s bowed up at this point and there will be oily residue around that point. Other than this, it’s a case of check pipe work as you are doing looking holes unless someone knows anything more likely. Neil

Dec 27th, 2013, 20:09	#6
TheScrew1972 Senior Member Last Online: Jun 21st, 2024 21:00 Join Date: May 2011 Location: My Own Little World	Haven't noticed any change in smoke (either colour or amount produced). I have been told that it is sucking in air through the filter box lid, which has a broken lug and so does not seal properly due to being 'bowed' inwards in the middle. Had to order a full box from the main dealers, £160, as couldn't source one from a breakers. Had a read of this thread: http://www.volvoforums.org.uk/showth...=69443&page=12 and got me wondering just how soft is too soft, and how hard should the pipe be? Mike

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