[35d]

My engine is making similar sound to this

When you lightly tap the throttle you can hear it
Sometimes when you don't press the throttle even you can hear it


Mostly hear when driving slowly with windows up and no outside noise

Please help what can it be

[tmarshall57]

Is it the high pitched whining noise you are concerned about?

I had a similar noise on mine which turned out to be the serpentine belt idler. As the care had done over 140,000 miles at the time I replaced the belt, idler and tensioner. It turned out that only the idler was shot.

Could also be normal turbo whine?

[35d]

It's the chhhh sound air release sound I'm worried about

[Pumper]

Since the sounds starts at higher rpms, it might be turbo or a vacuum leak somewhere.

[35d]

My sound is at lower rpm too

Easy to hear on light throttle

[Ajs_435d]

Sounds like a small exhaust gas/air leak I'd check turbo, downpipe connections etc.

Have you done an Obd type log?

[35d]

Originally Posted by ajs_335d

Sounds like a small exhaust gas/air leak I'd check turbo, downpipe connections etc.

Have you done an Obd type log?

I wil check all connection and hoses. The only thing I done was to change the vacum hoses and check actuators working fine. After that I started noticing it
Does yours not make this sound, it's not as loud as video. Just when you opn bonnet and just blip throttle say 1/4 way pedal down you hear it like a chhhh air releasing sound. I though it may be wastage sound which is more notable with no dpf

What's an obd type log?

[35d]

Here the sound

[dy63]

Does it sound like a duck quacking? If yes then go for the egr pressure converter

[35d]

Yes does sound like duck sounded like a air leak at first but with bonnet up sound like duck quacking

[tmarshall57]

It will be the EGR pressure converter converter then. Check to see if the noise disappears when vacuum hose from EGR valve is clamped. Search the forum also for "duck" or "quack".

[35d]

Ok we're is it located under intake manifold?

[dy63]

towards back of engine block at bottom of dipstick. i changed mine when manifold was off when i done glowplugs. its got 2 bolts attached to it. think i paid around £80 for euro but if its duck quack its your egr pressure converter

[bimmaguy]

Originally Posted by 35d

Ok we're is it located under intake manifold?

If it's a duck/quack type noise then it will be egr related.

As I had the quack noise on my X5 that suddenly appeared at point of purchase.

The seller agreed to get it sorted under his BMW warranty, which he did.

I took it to BMW and they sorted it by replacing the egr.

The bill was around £500 but luckily was covered by the warranty!!

[dy63]

Originally Posted by bimmaguy

If it's a duck/quack type noise then it will be egr related.

As I had the quack noise on my X5 that suddenly appeared at point of purchase.

The seller agreed to get it sorted under his BMW warranty, which he did.

I took it to BMW and they sorted it by replacing the egr.

The bill was around £500 but luckily was covered by the warranty!!

cheapest option for OP would first be to go to the controller IMO. it happened to me. had quacking and changed pressure converter for EGR and it stopped quacking.

[Murphyslaw]

Easiest test would be to clamp the hose coming out of the egr and try and replicate the noise.

[35d]

Was the pressure converter for egr all sorted now

Thanks