Help please. No boost and rattle noise

[Onethreelee]

Firstly hello I'm Lee and new to the forum.
I'm from the uxbridge area.
I own a graphite blue 5 door mk5 gti with I want to modify and make DIY vids to help people out along the way.

In desperate need of help. I have no boost and no codes.
I have changed the dv.
I have changed the boost control solenoid.
Still no boost.
Also a major rattle from the timing chain cover that instantly stops when I
Unplug the oil control valve.
Please please help.

[pudding]

The rattle is likely a broken oil control ring in the chain cover, it's quite common.  I suspect the middle ring of the 3 has snapped, which causes the rattling when hot.

As for no boost, what, none at all?  You would definitely get underboost fault codes, even if the turbo was completely shot to pieces.  The broken oil ring doesn't affect boost, so you need to give it a good going over and do some good old fashioned trouble shooting on it.  Laptops won't tell you everything unfortunately.

[Onethreelee]

Thanks for the reply il whip the cover off and check the 3 rings.
As for the no boost its not logging any codes I can hear the turbo wanting to work and boost gauge reads normal vac pressure and boost to 1 psi if that.
I've changed the dv and boost control solenoid.
My next guess was going to be boost pressure sensor on the front pipe or maybe maf as there is no difference when I unplug it.

I've checked all the hoses and vac lines and no leaks to my knowledge no.
No smoke from exhaust and starts and idles as it should ( apart from the typewriter doing overtime in the timing chain cover when hot)

I'm starting to loose hope

[GVK]

It's hard to see/access but I'm wondering if the wastegate arm has come off the turbo

[Onethreelee]

Thanks il get under the car at some point and try and check this out

[Northern_ED30]

I think you and me have had the exact same thing happen at the same time?!?!?!? 

My car feels like it has no turbo, I can hear the turbo fluttering so I wonder if the wastegate is stuck open like others have said...

[Onethreelee]

I think you and me have had the exact same thing happen at the same time?!?!?!? 

My car feels like it has no turbo, I can hear the turbo fluttering so I wonder if the wastegate is stuck open like others have said...

Well I'm feeling your pain I re scanned the car today and I'm now getting a code for the boost pressure sensor - value below lower control limit but I think that's just because the car is seeing no boost. I'm flat out busy with work ATM so hard to get time to work on the car. Maybe just have to find a reputable vag guru to take it fix it and then give me the eye watering bill.
Good luck with yours let me know how you get on

[Northern_ED30]

Gonna get under mine tomorrow, someone on the forum said to check the hoses to the intercooler, if they look okay it will likely be a wastegate or actuator issue.


Will let you know

[Onethreelee]

Gonna get under mine tomorrow, someone on the forum said to check the hoses to the intercooler, if they look okay it will likely be a wastegate or actuator issue.


Will let you know
OK cool thanks hopefully you find your problem.
I checked all my hses already and all seem fine :(

[Northern_ED30]

Checked my hoses and they’re fine too mate, borrowed a sh*tty code reader and it gave me code 01314 which says it can’t communicate with the ECM.

Think that’s a false code to be honest


This is a video I took today with my foot the the floor, is yours the same?

eature=share

[Onethreelee]

Pretty much its not full blown limp mode it just no boost I have a boost gauge and the vac is normal and then boost stops at between 0 and 1 psi il try get a vid after work on my way home so you can see.

Did you manage to check your actuator??

[Northern_ED30]

Unfortunately not mate as for some reason the heavens opened today and haven’t stopped…

Mines going on on Tuesday, I’ll be sure to feedback the issue. I have EML on now after giving it some thrashing today haha

[Onethreelee]

Yeah it's been a wash out for me too.
Well hopefully you get it sorted mate. Let me know how you get on

[Onethreelee]

I took a video but can't work out how to share it lol

[Onethreelee]