What Is This Air Popping Noise in My D5 Engine?

[zakmuh]

Hi,

I need some help on this please. There is a strange popping noise coming through the air pipe which goes to the turbo unit in my 2007 XC90 D5 engine. I wonder what this noise is? This is not normal. Please have a look tat this video:

https://youtu.be/zGmR1GPw0P8

I'm not sure if you can hear that popping noise but its there. Its quite loud when you stand far away from the car. I initially thought it was coming from the EGR valve but when I was cvhanging the air filter, it was obivious that was from the air pipe. Any one had this issue and how did you solved it?

Any advice on this will be much appreciated.

Cheers

[GreenV8S]

Hard to make out - sounds almost mechanical. It seems to be at engine speed. Maybe a leaking exhaust gasket?

[E-bmw]

Connect it back up & leave it alone, there is nothing wrong with it.

[zakmuh]

Thanks but I think the noise is not clear in the video but it is vey noisy to be honest. People ask me about that noise cos its like 'pop pop pop pop...' and very annoying. Could there be somthing wrong with the turbo or intercooler, you think?

[oldcynic]

Sounds like a D5 Volvo engine to me. I’ve got a v70 and an xc90 and they both make all sorts of weird engine rattles and always have done - especially the v70 which will hit 200000 miles this month and is still going strong (190000 of those in our ownership).
More relevant is to listen for whooshing and hissing noises as the turbo pipes eventually split. I don’t think there’s an original turbo hose left on my v70.

[E-bmw]

It is just air pulses in the inlet as far as I can tell & yes it will be obvious with the air inlet disconnected, make sure everything is connected properly, the air filter is closed up properly with all screws/clips & has the correct filter in it, that will quieten it down.

[GreenV8S]

Is that just a quirk of the firing order? If that's the 5-cyl modular engine I think it's similar to my Duratec RS. I haven't tried listening to that with the intake removed but I don't hear anything like that sound.

[zakmuh]

That popping noise is more like you hitting a wooden board with a hammer. This is my first Volvo, so I'll take it as normal for a D5.

Thanks for your time on this guys

[ianrobbo900]

Sorry to resurrect an old thread, but question to the OP - did you ever get to the bottom of that?

Mine is doing the exact same thing, 2005 XC90.

[Heraldsteve]

My Citroen diesel van has just started making the same noise only much louder and is accomplished by power loss. I'm led to believe it is likely to be a failed turbo.

[Darlo 1]

That noise is usually caused by a vacum leak, with all the pipework back together take off the oil filler cap when the engine is running, if you get the same noise coming from the oil filler then you have a vac leak, possibly the vacum controlled engine mounts are leaking, isolate the vac feed to them and if the noise goes theres your problem.

[Heraldsteve]

I hope it's not the sane for you but I've just discovered it's a broken inlet rocker causing my similar problem.

[ianrobbo900]

I can understand a bad turbo because it seems to come through the intake system, but I'm not gettting a power loss.

I've tested my vacuum system with a vac tester, no issues - it is a similar but not the same noise as the one you get from the oil filler when you disconnect the vacuum pipe from the TCV.

I would have thought that a broken rocker would have caused the engine to run on 4?

[GreenV8S]

ianrobbo900 said:

I would have thought that a broken rocker would have caused the engine to run on 4?

I seem to remember long ago hearing about somebody who had transplanted a big engine into a small van and kept breaking the transmission. Because it was inconvenient to have to keep taking the gearbox out, the owner decided to simply blank off two exhaust ports - doing nothing else at all to the engine.

Against all logic, the engine ran smoothly on all cylinders and produced roughly half the original torque, which was exactly what the owner was aiming for.

The prevailing theory was that the blanked off cylinders were exhausting back into the intake manifold and the resulting 50% EGR was being shared between all four cylinders well enough for them all to run OK-ish.

Bottom line is that a broken exhaust rocker might possibly result in funny noises in the intake without dropping a cylinder.

[ninjag]

ianrobbo900 said:

Sorry to resurrect an old thread, but question to the OP - did you ever get to the bottom of that?

Mine is doing the exact same thing, 2005 XC90.

EGR valve stuck open.

[ianrobbo900]

ninjag said:

EGR valve stuck open.

I like that idea - do you have any experience of that?

Can you remove/blank the EGR system on the D5 engine?

[ninjag]

ianrobbo900 said:

I like that idea - do you have any experience of that?

Can you remove/blank the EGR system on the D5 engine?

I've cleaned quite a few EGR valves, dirty job and they can be properly caked. I personally wouldn't blank or remove one. Regarding the original poster, he updated his YouTube comments saying that the EGR was the problem, I was just relaying it on for you

[ianrobbo900]

ninjag said:

I've cleaned quite a few EGR valves, dirty job and they can be properly caked. I personally wouldn't blank or remove one. Regarding the original poster, he updated his YouTube comments saying that the EGR was the problem, I was just relaying it on for you

Thanks, appreciate that, I'll look on you tube again.

I have no particular desire to remove the EGR system, but blanking it off temporarily might be a good way to fault find if nothing else.

[ninjag]

ianrobbo900 said:

Thanks, appreciate that, I'll look on you tube again.

I have no particular desire to remove the EGR system, but blanking it off temporarily might be a good way to fault find if nothing else.

For sure it could help with the process of elimination. Judging from the age of your car I would suspect the EGR valve could use a good clean anyway, so it would't be a waste of time. I've got two in my car, fun and games!

[zakmuh]

Hi guys. It took 3 years for me to find the location of this noise lol

https://www.youtube.com/watch?v=q4BJiXVvDpo&t=...

Before I get my hands on removal of intake manifold, I want your advice on this please

Ta