Odd new turbo noise

-bobda- · Apr 23rd, 2006, 00:05

I've suddenly developed a new noise when the car is under load (ie - not at idle) at around 1500-2300 rpm.

Where I used to get a hint of turbo whistle, I now get a noise which can only be described as a whirring/whooshing noise. It sounds like something spinning and it only does it when accelerating, and stops as gradually as it starts.

It's only started in the last day and the performance doesn't appear to have altered much, although (and it may just be my imagination) the turbo doesn't seem to be following itself through on gear changes as much as it used to and the engine appears to last a fraction of a second longer after I flick the key off.

What could it be? I'm almost certain it's something in the turbo area, but I'm not well versed on the workings of turbos, so I don't really know what to look for.

It's a 2002 S40 1.9 TDCi which has done 61000 miles with a remap at 60000 (if that makes any difference).

Apr 23rd, 2006, 01:54

Noise could be an air leak?
Or could it be overboosting do you think?

Don't see why that should make it run on though. Is the temperature ok (not too hot?) BTW if you ever find it won't turn itself off, just let the clutch up with it in gear and foot on the brake, to stall it. It can happen you know!

What happens if you leave it to idle for a fair while before you turn it off? Does it still run on then?

Dunno much about diesels I'm afraid, although I guess they're just like petrol engines but smellier

(Only joking!

)

-bobda- · Apr 23rd, 2006, 14:53

It could be an air leak, which may have reduced the whistle I was getting before.
I hear a lot of things about turbo hoses splitting, but I don't know where to start looking to check.

It's not running on as such, just maybe having one more tick before actually going off completely.

It's not running any differently (in terms of temperature and idle speed etc) as it was previously.
Driving it today, the turbo doesn't seem to be as progressive as it was previously, it's kicking in, but it's all coming in one lump whereas before it was a lot smoother.

-bobda- · Apr 24th, 2006, 11:55

A post on the Honest John website has advised me to check for air leaks on the output side of the turbo, which I did yesterday.

I came across what appears to be a patch of oil which looks like it is coming from the top part of the turbo manifold (I think).

This picture shows where the patch is, could a new gasket on this join solve my problem?

Apr 24th, 2006, 16:29

Is the turbo oil cooled on your diesel I thought they were water cooled? If you think the oil is coming from there then you could try a gasket as a cheapo thing to see if it fixes it. But be sure because oil is a funny thing, it can blow around all over the place so might be coming from elsewhere.

Cheers, Pete

-bobda- · Apr 24th, 2006, 22:29

Yeah, it's oil cooled.

I've had another good root around under there this evening and took my dad out for a listen, who agreed that it is DEFINITELY an air leak either before or (more likely) after the turbo.

Now to find where it's coming from...

PS - I think it's getting louder.

jeremymarksuk · Jun 21st, 2006, 16:32

Is there an update to this thread as my V40 is now making a hissing noise again, the mechamaniac cannot find any air leaks on the hoses (they were replaced last year) and it is not the MAF unit (replaced last year aswell).

It is not down on power but there is a hissing noise which is very loud as it comes on boost.

Could it be the EGR valve? I also have oil in the same place and the bolts have been tightened up.

Any words of advice most welcome.

Jeremy

-bobda- · Jun 21st, 2006, 22:36

I was actually just about to reply to this thread with an update...

I got the car back yesterday after 2 1/2 weeks away with the company I bought it from, getting the turbo replaced under warranty as that was what Volvo diagnosed as the likely cause of the noise.

It's STILL making a noise on boost, so I'm now thinking that it could well be the EGR valve, since the Volvo dealer I went to also said that there was a fault code logged for the EGR valve.

I'm going to check out the air filter for gaps/leaks and replace my panel filter with a standard Volvo/OEM one to see if it makes any difference to the noise.

I've now got an aftermarket warranty on the car, so if it IS the EGR valve, hopefully they will cover the cost of that work which Volvo said would be just over £500 which includes their 50% goodwill payment towards it.

The technician did say though, that if the EGR valve was faulty, then it could be identified by a lurching sensation.

I've read around a few forumd and Renault (whose engine it is) have issued a cleaning tool to their technicians to de-coke the EGR valve if they're not too bad so I think I'll go to my local Renault specialist/dealer and see if they can help out first off.

Jun 27th, 2006, 14:05

I've been following this thread with great interest as my 03 1.9D V40 has been making this kind of noise since December.

August last year one of the turbo hoses split and i ended up driving over 50 miles home with a bad leak on the system (black smoke, no power etc) The hose was then replaced and everything was fine. I asked the dealer if i could have damaged the turbo and they said no. Everthing was fine until December when i got the extra whistling noise on accelaration. It was definately a "new" noise.

I then went back to the dealer as i thought i had another air-leak in the turbo pipes. They ran a load of tests on it and couldn't find anything. They even said that noise was normal . Since then the cars been running ok but i still get the noise - if you floor the accelerator then lift off 2-3 seconds later you can really hear it suck then stop. I don't think i;ve lost any power though and it idles without a murmor.

So i guess my next port of call is the dealer again to check the EGR valve. Let us know how you get on with yours and good luck.

-bobda- · Jun 28th, 2006, 08:49

Isn't it funny, every time a new person posts on here, I have some news to post about my problem...

Last night, as I was on the M62 on my way home at 23.30, my turbo blew.
It was changed (as you can see) the week previous but the noise was still present.

I don't know if you've ever seen a turbo blow at motorway speeds, in the dark, but the amount of white smoke that came out of the car was unbelievable. I managed to stop and when I looked back, couldn't see either carriageway of the motorway further than 200 yards away.

The RAC flatbedded it home for me and I need to open up a can of whoopass on the garage who changed the turbo last week.

My suspicion is that the EGR valve has stuck shut, the combustion temperatures got too high and blew the turbo with dramatic consequences.

I will be investigating my options further today...

Apr 23rd, 2006, 00:05	#1
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	Odd new turbo noise I've suddenly developed a new noise when the car is under load (ie - not at idle) at around 1500-2300 rpm. Where I used to get a hint of turbo whistle, I now get a noise which can only be described as a whirring/whooshing noise. It sounds like something spinning and it only does it when accelerating, and stops as gradually as it starts. It's only started in the last day and the performance doesn't appear to have altered much, although (and it may just be my imagination) the turbo doesn't seem to be following itself through on gear changes as much as it used to and the engine appears to last a fraction of a second longer after I flick the key off. What could it be? I'm almost certain it's something in the turbo area, but I'm not well versed on the workings of turbos, so I don't really know what to look for. It's a 2002 S40 1.9 TDCi which has done 61000 miles with a remap at 60000 (if that makes any difference). __________________ Andy. --- 2003 S40 T4 Sport Lux.

Apr 23rd, 2006, 14:53	#3
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	It could be an air leak, which may have reduced the whistle I was getting before. I hear a lot of things about turbo hoses splitting, but I don't know where to start looking to check. It's not running on as such, just maybe having one more tick before actually going off completely. It's not running any differently (in terms of temperature and idle speed etc) as it was previously. Driving it today, the turbo doesn't seem to be as progressive as it was previously, it's kicking in, but it's all coming in one lump whereas before it was a lot smoother. __________________ Andy. --- 2003 S40 T4 Sport Lux.

Apr 24th, 2006, 22:29	#6
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	Yeah, it's oil cooled. I've had another good root around under there this evening and took my dad out for a listen, who agreed that it is DEFINITELY an air leak either before or (more likely) after the turbo. Now to find where it's coming from... PS - I think it's getting louder. __________________ Andy. --- 2003 S40 T4 Sport Lux.

Jun 21st, 2006, 16:32	#7
jeremymarksuk Jeremymarksuk Last Online: Oct 20th, 2015 08:55 Join Date: Oct 2004 Location: dorset	Odd Noise Is there an update to this thread as my V40 is now making a hissing noise again, the mechamaniac cannot find any air leaks on the hoses (they were replaced last year) and it is not the MAF unit (replaced last year aswell). It is not down on power but there is a hissing noise which is very loud as it comes on boost. Could it be the EGR valve? I also have oil in the same place and the bolts have been tightened up. Any words of advice most welcome. Jeremy

Jun 21st, 2006, 22:36	#8
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	I was actually just about to reply to this thread with an update... I got the car back yesterday after 2 1/2 weeks away with the company I bought it from, getting the turbo replaced under warranty as that was what Volvo diagnosed as the likely cause of the noise. It's STILL making a noise on boost, so I'm now thinking that it could well be the EGR valve, since the Volvo dealer I went to also said that there was a fault code logged for the EGR valve. I'm going to check out the air filter for gaps/leaks and replace my panel filter with a standard Volvo/OEM one to see if it makes any difference to the noise. I've now got an aftermarket warranty on the car, so if it IS the EGR valve, hopefully they will cover the cost of that work which Volvo said would be just over £500 which includes their 50% goodwill payment towards it. The technician did say though, that if the EGR valve was faulty, then it could be identified by a lurching sensation. I've read around a few forumd and Renault (whose engine it is) have issued a cleaning tool to their technicians to de-coke the EGR valve if they're not too bad so I think I'll go to my local Renault specialist/dealer and see if they can help out first off. __________________ Andy. --- 2003 S40 T4 Sport Lux.

Apr 23rd, 2006, 01:54	#2
peteS40 Guest Location:	Noise could be an air leak? Or could it be overboosting do you think? Don't see why that should make it run on though. Is the temperature ok (not too hot?) BTW if you ever find it won't turn itself off, just let the clutch up with it in gear and foot on the brake, to stall it. It can happen you know! What happens if you leave it to idle for a fair while before you turn it off? Does it still run on then? Dunno much about diesels I'm afraid, although I guess they're just like petrol engines but smellier (Only joking! )

Apr 24th, 2006, 16:29	#5
peteS40 Guest Location:	Is the turbo oil cooled on your diesel I thought they were water cooled? If you think the oil is coming from there then you could try a gasket as a cheapo thing to see if it fixes it. But be sure because oil is a funny thing, it can blow around all over the place so might be coming from elsewhere. Cheers, Pete

Jun 27th, 2006, 14:05	#9
Jaso Guest Location:	I've been following this thread with great interest as my 03 1.9D V40 has been making this kind of noise since December. August last year one of the turbo hoses split and i ended up driving over 50 miles home with a bad leak on the system (black smoke, no power etc) The hose was then replaced and everything was fine. I asked the dealer if i could have damaged the turbo and they said no. Everthing was fine until December when i got the extra whistling noise on accelaration. It was definately a "new" noise. I then went back to the dealer as i thought i had another air-leak in the turbo pipes. They ran a load of tests on it and couldn't find anything. They even said that noise was normal . Since then the cars been running ok but i still get the noise - if you floor the accelerator then lift off 2-3 seconds later you can really hear it suck then stop. I don't think i;ve lost any power though and it idles without a murmor. So i guess my next port of call is the dealer again to check the EGR valve. Let us know how you get on with yours and good luck.

Jun 28th, 2006, 08:49	#10
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	Isn't it funny, every time a new person posts on here, I have some news to post about my problem... Last night, as I was on the M62 on my way home at 23.30, my turbo blew. It was changed (as you can see) the week previous but the noise was still present. I don't know if you've ever seen a turbo blow at motorway speeds, in the dark, but the amount of white smoke that came out of the car was unbelievable. I managed to stop and when I looked back, couldn't see either carriageway of the motorway further than 200 yards away. The RAC flatbedded it home for me and I need to open up a can of whoopass on the garage who changed the turbo last week. My suspicion is that the EGR valve has stuck shut, the combustion temperatures got too high and blew the turbo with dramatic consequences. I will be investigating my options further today... __________________ Andy. --- 2003 S40 T4 Sport Lux.

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