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Z4 3.0si N52 (facelift) hissing / performance issues

Discuss problems you have had or are having with your Z4
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David
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Mon May 01, 2017 1:09 pm

Going to be investigating today, and searching for a vacuum leak, as I'm experiencing the following issues:

• Strong petrol smell on start-up
• Hissing/Squirting noise can be heard on light acceleration
• MPG decrease
• Power decrease

The noise has been present for a while. Initially I thought it was just wind noise between the car body and the hardtop, as it is audible on the left side of the car, when sat in the drivers seat. But since removing the hardtop the noise has continued and worsened. This noise was also present before fitting my AFE cold air intake, but I will also inspect that for leaks.

I've been researching this over the past week, and it seems like I'm not the only one who has had this issue. Lots of others have taken their cars to BMW for this hiss, and all have reported that the techs have told them it's "just a characteristic of the engine", which I, along with others, fail to believe.

The noise can be heard in this clip, which is not my video, but the noise is identical:


https://youtu.be/TKskUA7H0PQ


And one of many a thread where people have experienced the same issue:

http://www.bimmerfest.com/forums/showth ... p?t=526444

People with a similar issue on the 3.0i M54 have resolved this by replacing the DISA valve gasket, which will be my first port of call along with inspecting all the hoses.

(From ZRoadster.org) @MAURICE THE MARTIAN had a similar issue recently which @Murray Wall helped him resolve. I'm hoping someone on here has had a similar experience with the later engine (N52)?

Any help/advice is much appreciated!

David

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Mon May 01, 2017 1:32 pm

New I will be creating a couple of new gaskets on the cold air intake, using this stuff I found on Amazon:

Image

It's primary use is in hospitals for non slip surfaces, as it's non toxic/antimicrobial, so I figured it should create a good seal. Hopefully there won't be any issues with heat of the engine.

I am also armed with an o-ring set, so I won't have any issues sourcing the correct size o-ring for the DISA valve seal.

Image

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Mon May 01, 2017 7:53 pm

Update:

Inspected the DISA valve and the seal looks in good nick, so I have left that as is, and eliminated that from the list of suspects.

There was a bit of oil inside the inlet manifold, which I've been told is normal (...anybody?)

Also refitted the the cold air intake, added gaskets, and an o-ring to the MAF sensor. Also made sure all the jubilee clips were tight and seated well.

Took the car for a drive, and didn't notice any change in performance/economy. Unfortunately, I couldn't hear if I've cured the hissing as there was surface water on the road, which made a very similar noise to the hissing.

Will update on the next dry day.

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Smartbear » Mon May 01, 2017 7:56 pm

Check the ccv hoses as well, not good to have a lot of oil in the inlet manifold-could be a sign of a bad ccv?
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Mon May 01, 2017 8:23 pm

Smartbear wrote: Mon May 01, 2017 7:56 pm Check the ccv hoses as well, not good to have a lot of oil in the inlet manifold-could be a sign of a bad ccv?
Rob
Thanks, I will have a look!

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Tue May 30, 2017 12:18 am

Update: (or lack of...)

Hissing noise still present.
Petrol smell still present.

Injectors removed and cleaned today.

INPA didn't throw up any error codes, nor did it display any worrying stats or short/long term fuel trim percentages. So it doesn't look like I've got any unmetered air getting in?

Next up:

- Check fuel lines and pressure
- Check CVV

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Marlon » Tue May 30, 2017 5:27 pm

Its a new one on me David :?
Hope you get to the bottom of it
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by goldbcfc » Tue May 30, 2017 6:52 pm

when was the fuel pump last changed?

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Tue May 30, 2017 7:52 pm

goldbcfc wrote: Tue May 30, 2017 6:52 pm when was the fuel pump last changed?
Not aware of it ever being changed, but will double check the history that came with it. I've owned the car just over a year now, and it's now done 35k miles.

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by ph001 » Thu Aug 31, 2017 2:39 pm

Hate it when people leave threads open and don't feed back to the community. I wonder if David ever got to the bottom of this?
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Fri Sep 01, 2017 8:39 am

ph001 wrote: Thu Aug 31, 2017 2:39 pm Hate it when people leave threads open and don't feed back to the community. I wonder if David ever got to the bottom of this?
Thanks for the valuable input and constructive comment! :x :rofl:

I've made no progress with this since, other than removing my AFE CAI, and fuel consumption has improved slightly.
Last edited by David on Wed Sep 27, 2017 3:32 pm, edited 1 time in total.

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Carmad84 » Wed Sep 06, 2017 9:11 pm

I have the same sound on very light acceleration but no petrol smell.

I just thought as the tech guy that it was a common thing.

I think you have to have good hearing as I keep trying to get other people to hear it and they never can, I think some think I've gone crazy!

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Sun Sep 24, 2017 1:38 am

Carmad84 wrote: Wed Sep 06, 2017 9:11 pm I have the same sound on very light acceleration but no petrol smell.

I just thought as the tech guy that it was a common thing.

I think you have to have good hearing as I keep trying to get other people to hear it and they never can, I think some think I've gone crazy!
Yes, I’m the same. Drives me nuts but no one else seems to notice it. Seems so obvious and intrusive when driving past close walls/cars/railings as the sound bounces off them.

Still no progress unfortunately!

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Scooba_Steve » Sun Sep 24, 2017 10:41 am

The work involved getting the manifold off, if you're going to check the CCV, you might as well just replace it for what they cost.
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Wed Sep 27, 2017 3:33 pm

Scooba_Steve wrote: Sun Sep 24, 2017 10:41 am The work involved getting the manifold off, if you're going to check the CCV, you might as well just replace it for what they cost.
Definitely agree with this. That's the next step, though I'm not sure when I've get a chance to do it.

David

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