Loss of Full Boost Pressure

5.0 V10 50v biturbo - 571 bhp
c3nturi0n
2nd Gear
Posts: 112
Joined: Tue May 29, 2018 10:50 am

Re: Loss of Full Boost Pressure

Post by c3nturi0n » Mon Oct 08, 2018 12:20 pm

any tips or hints?

Cheers.

Toady1
2nd Gear
Posts: 141
Joined: Mon Jul 10, 2017 2:13 pm

Re: Loss of Full Boost Pressure

Post by Toady1 » Mon Oct 08, 2018 1:40 pm

Mines also losing full boost. I can hear a hissing noise coming from the rear of my engine around the RS6 oil filter cover area. I'm going to look into this area at the weekend as I'm convinced I've a vacuum pipe that has split or come off causing my issues as I've got no fault codes on vcds. I assumed it'd be an N75 valve but they are working fine according to VCDS. The car is new to me so I dont know if the hissing noise is normal or not in that area, I can't see why it would be. I checked all my boost pipes and tightened them up at the weekend, but they were all fine.

Toady1
2nd Gear
Posts: 141
Joined: Mon Jul 10, 2017 2:13 pm

Re: Loss of Full Boost Pressure

Post by Toady1 » Wed Oct 10, 2018 10:34 pm

Found my fault this evening! A split PCV pipe at the rear of the engine. Went to remove the pipe from the rocker cover and the whole thing snapped off in my hand. Tried to use insulation and duck tape to see if it fixes it and it did 99%. Still leaks as it is under a fair bit of positive pressure, so need to source a new pipe, but hissing sound is pretty much gone and full boost is restored.

Image
Image

c3nturi0n
2nd Gear
Posts: 112
Joined: Tue May 29, 2018 10:50 am

Re: Loss of Full Boost Pressure

Post by c3nturi0n » Thu Oct 11, 2018 3:09 pm

cheers... onto a DIY tonight if I get time ;)

Toady1
2nd Gear
Posts: 141
Joined: Mon Jul 10, 2017 2:13 pm

Re: Loss of Full Boost Pressure

Post by Toady1 » Thu Oct 11, 2018 4:31 pm

I had no codes with mine on vcds.

ATinOf
2nd Gear
Posts: 246
Joined: Fri Jul 06, 2018 7:32 pm
Location: Cheshire

Re: Loss of Full Boost Pressure

Post by ATinOf » Fri Oct 12, 2018 1:52 pm

This gets brittle and snaps easy. You sure its your problem and not another one youve created?

If this is the PCV return to the oil tank breather Ive got one of these that has been DIY repaired if you are interested for a fee. I will find an image of it for you.

ATinOf
2nd Gear
Posts: 246
Joined: Fri Jul 06, 2018 7:32 pm
Location: Cheshire

Re: Loss of Full Boost Pressure

Post by ATinOf » Fri Oct 12, 2018 7:31 pm

Toady1 wrote:
Wed Oct 10, 2018 10:34 pm
Found my fault this evening! A split PCV pipe at the rear of the engine.
ATinOf wrote:
Fri Oct 12, 2018 1:52 pm
If this is the PCV return to the oil tank breather Ive got one of these that has been DIY repaired if you are interested for a fee. I will find an image of it for you.
Here you go - my damaged pipe, clean break
Image

And my double heat shrink repair
Image

This was subsequently replaced with a new one but worked fine while it was on temporarily;the new one obviously comes with the other 2 pipes heatshrunk to it as an assembly which is why its steep - GBP102.00 plus VAT
Part ref; 07L 103 542A

Make me a reasonable offer to make it worthwhile me parting with this emergency spare and its yours, bear in mind mine also comes as the whole 3 pipe assembly

Toady1
2nd Gear
Posts: 141
Joined: Mon Jul 10, 2017 2:13 pm

Re: Loss of Full Boost Pressure

Post by Toady1 » Sat Oct 13, 2018 12:11 pm

Hi, I bought a full assy from Audi yesterday for as you say.....£128! Also a new A/C pressure sensore as that's also gone. I'm hoping that this is my fault. As you say these pipes become very brittle due to age and heat, and they get disturbed when oil changes are done to access the oil filter. So there is most likely further breaks somewhere which is why I just bought the whole assy. I also did a very similar repair to my pipe as you did with some reinforced marine pipe and heat shrink. But I can still hear (albeit quieter) a hissing noise, hence thinking I have another leak. I'm pretty sure this is my fault. What's access like to the rest of the joints? looks crap!

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