Car still playing up

[Scorponok]

Ok don't really know what's going on with my car, I think it may be boost leak causing car to lose a bit of power or is it limp mode caused by something else? The DV was gone so I replaced that, I have tested MAF and that seems ok. I changed the N75 valve no change either
I'm going to double check the boost hoses and see if any more codes have popped up. The last code was pressure lose check DV which I cleared after changing. Anything else I should've checking? Oh I put the original map on made no difference as well.... There are no misfires but my MPG terrible, averaging 18.7

 

[nd-photo.nl]

Clear codes, drive a bit and scan it again. Post the codes and search them up. There is lots of info to be found on vcds/vagcom errors!

 

[Scorponok]

Yeah will do mate I hope so. Haven't checked breather pipes so I check them as well. Think I have only experienced a few days off car running right since got it lol.

 

[Scorponok]

Scanned car with VAGCOM again and this code is back:

17705 - pressure drop between turbo and throttle valve (check D.V) P1297 - 35 - 00

DV and N75 are good so am I looking at every single boost hose and vacum hose?

N249 valve had been bypassed

 

[Pablo225]

Scanned car with VAGCOM again and this code is back:

17705 - pressure drop between turbo and throttle valve (check D.V) P1297 - 35 - 00

DV and N75 are good so am I looking at every single boost hose and vacum hose?

N249 valve had been bypassed

Yeh lol. If you don't already have uprated clamps Id get some and replace also.

You could tighten the clamps, clear the fault and see if it comes back.

Check for split hoses also..

 

[DannyJigg]

It's a bit random but check the vac line going to the fuel pressure regulator. When i got the car I kept getting the boost leak code. Checked a lot of hoses but nothing appeared to be loose or damaged. Then, about 9 months later when I was adjusting the hose for my boost gauge I spotted the FPR braided hose was kinked, went to move it and realised the cloth was the only thing left intact!

The age of these cars is starting to show in places

 

[Scorponok]

Yeah if weather permits I be spending the day hunting for the leak!!
I was think about changing the FPR hose as I got spare silicone hose that should be enough to replace it all, cheers for advice I let you all know how I get on.
I swear I can hear air getting sucked in on the drivers side but i think I better check them all

 

[Scorponok]

Right checked hoses, got a few more to check which I will do tomorrow. I tightened clips and made sure all was good.
While underneath I noticed the nuts on the driveshaft we're loose! 2 were half out
It seems that has the boost builds normally around 2.5 to 3k rpm the boost dies and car feels a just like a turbo less 1.8t. I read a few threads and now I'm shitting it that it may be the turbo itself? There is not smoke at all but what I have read still is the possibility of oil starvation. I doubt it coils as there is isn't a misfire. Beginning to really regret buying this car but it is what it is I guess

 

[Scorponok]

I took the hose off the N75 valve that goes to turbo and I can't hear more boost but something is holding it back. Going to check spark plugs and the take charge pipe off and check turbo that side as the driveshaft nuts were lose god knows what else is!! Anyone know anyone in the Devon area that does smoke tests?

 

[daspeedfreek]

where abouts are you?

 

[Sprogpole]

This is so common on these engines now; there have been loads of threads about it. But no one has found a solution.

 

[nd-photo.nl]

Because the problem area is quite large. With that error, you will have to check the entire boost circuit for leaks!

Check under the intake manifold and visually check all hoses connected. Check the pipes and connections to the intercooler etc.

Mine were split hoses under the intake manifold. I only saw it becuase I disconnected the hoses (split in a bend, you cant see that when connected)

 

[Sprogpole]

But loads and loads of people still have this problem when there are no leaks!
People have changed all manner of parts and still not fixed.

Maybe the boost dropping at that RPM is the car trying to protect itself. It’s very consistent across many many threads. Hesitation between 2.5 and 3.5k rpm.
Maybe the boost dropping at that RPM is the affect not the cause of the problem.

 

[nd-photo.nl]

Hmm thats weird...Only way to know for sure is smoke test it.

 

[Scorponok]

I have read quite a few threads all with different causes and fixes, you are right there are a few people that seem to have this problem between 2.5 - 3.5k rpm. Causes from dodgy MAFs, boost leaks, N75 valve, the cars map and broken turbo or actuator etc
It feels like the car is protecting itself which I guess is the limp mode maybe..?
Yesterday I feel like it is more of a boost leak as I took charge pipe off and examined and wiggled the hose from turbo to charge pipe and checked if there we're lose bolts. Anyway put it all back together, drove car felt it boost quick then it suddenly done the same thing... So I be taking it off later and examine it closer and check jubilee clips. The panel to take off above the dipstick I can't undo the screws so going to have to break that off if this doesn't work so I can check those hoses closer.
One thing I noticed is that it's got a polished charge pipe and it's not the standard one as it hasn't got the filter thing inside. So I'm thinking maybe the hose ain't a great fit.
Thanks for all the advice I let you know how I get on.

 

[nd-photo.nl]

Add some info in your signature like: do you have an lc180 or lcr?

 

[Scorponok]

Done, think that's all the mods I haven't done any to it....yet

 

[nd-photo.nl]

Awesome, saves a lot of time for other forum members!

 

[Scorponok]

Lol yeah mate makes sense.
Update on car: tightened and checked hose either side of charge pipe the whistle has died down slightly but still there and still boost is dying of fast.
Also checked under inlet manifold and found a split in the elbow hose. I replaced that and oil dipstick case and boost is again slightly better and feels smother but still I'm losing the boost somewhere. There are a lot of hoses and couldn't see anything else. Would a intercooler cause this? I guess a smoke test would show it if it is leaking there. Getting there slowly I feel also would the air filter cause anything? I looked inside and it was dusty it's a BMC CDA so it is a bit restrictive anyway?

 

[Adam4D]

actuator itself could be reason for not holding boost