Whats that sound <<NOW WITH VIDEO!>>

bigwinn · Post by **bigwinn** » Mon Jul 20, 2020 7:14 pm

Now I don't want to be one of those guys who says 'I've got a weird noise what is it'... but

Just any pointers please to help me dig further- 2004 2.2 M54 100K

I have a very slight whistle (ish) noise from the engine. Happens briefly around 1200-1500rpm accelerating, when still or moving, in gear or out, mainly when hot not cold. I did notice it was less with aircon off but then made no difference.

What I've done:
- air filter changed and checked when I did service 2 weeks back
- all hose clips tightened
- DISA valve checked all ok

I'm thinking maybe a belt issue at the front of the engine?

Where would you guys look first?

Cheers

Stuart

patriot66 · Post by **patriot66** » Mon Jul 20, 2020 8:27 pm

I'd bet that it's the small convoluted pipe that branches off the rubber intake boot. The rubber perishes and causes a whistle at low revs/light throttle. Follow the pipe from air filter box to throttle body and you will see the convoluted branch.

: images.jpeg (8.42 KiB) Viewed 1087 times

Have a good look at it and it will probably be split like in the above photo

bigwinn · Post by **bigwinn** » Mon Jul 20, 2020 8:32 pm

Nice one- I'll have a look first thing

Stuart

sw4nny · Post by **sw4nny** » Mon Jul 20, 2020 9:53 pm

patriot66 wrote: ↑Mon Jul 20, 2020 8:27 pm I'd bet that it's the small convoluted pipe that branches off the rubber intake boot. The rubber perishes and causes a whistle at low revs/light throttle. Follow the pipe from air filter box to throttle body and you will see the convoluted branch.images.jpeg
Have a good look at it and it will probably be split like in the above photo

After owing 3 cars with the m54 engine i have had to replace this part on all of them.
Seems like a good shout to check this out for anyone with an m54 lump

bigwinn · Post by **bigwinn** » Tue Jul 21, 2020 2:51 pm

Did some investigating- no obvious splits on the boot but deffo starting to perish/crack

Refitted and immediately no sound, but will see if it does the same hot

Will see if that has fixed it (tightening it all up etc) and go from there

Cheers for the input!

bigwinn · Post by **bigwinn** » Thu Jul 30, 2020 5:14 pm

Afternoon all

So the sound still lives on

Deffo when hot not cold
Deffo low revs under strain/load

Where next would you recommend?

bigwinn · Post by **bigwinn** » Thu Jul 30, 2020 6:57 pm

Now with added video... slight blip of the throttle 2 times

https://youtu.be/cISq5dfc320

bigwinn · Post by **bigwinn** » Thu Jul 30, 2020 7:02 pm

It may be nowt but it does seem worse with aircon ON

kinger · Post by **kinger** » Thu Jul 30, 2020 7:43 pm

Blackbird..

bigwinn · Post by **bigwinn** » Thu Jul 30, 2020 8:14 pm

kinger wrote: ↑Thu Jul 30, 2020 7:43 pmBlackbird..

Winner

dans6490 · Post by **dans6490** » Fri Jul 31, 2020 7:25 pm

I had this noise on my first Zed and never got to the bottom of it. Only engine mod I did was change the air filter to a k&n one.

Second Zed had the same noise but only after changing the air filter again. Tried re-fitting and tightening etc but the noise remained.

Might not be this on yours but after I reverted back to stock, the noise went.

Might be worth re-checking fittings after the air filter change.

bigwinn · Post by **bigwinn** » Fri Jul 31, 2020 7:36 pm

I will have another look at the air side... cheers

ph001 · Post by **ph001** » Fri Jul 31, 2020 11:08 pm

Could be oil filter. Weird I know!

Sgr74 · Post by **Sgr74** » Fri Jul 31, 2020 11:42 pm

I changed the same hose with the flexi appendage when I fitted a ramair filter and refurbed my disa valve. I love the induction noise and i believe it has a little more get up and go, although it may just be the sound. The fuel consumption seems a bit better,

but I have a slight whistle at 2000 revs. I’ve removed and retightened everything and it’s still there. Over the course of the weekend I’m going to put the standard air box back on and try that. I’ll post the result.

TheDan · Post by **TheDan** » Fri Jul 23, 2021 2:37 pm

Sorry, to resurrect an old thread bigwinn, but did you ever get to the bottom of this whistle?

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