Loss of power on turbo

[ORS]

Hi, I have a 2004 LCR which just last week started to lose power when the turbo kicks in, it's a bit intermittent as sometimes it goes fine then cuts off and on when it pleases, I took it into my local garage where they found a lose hose, this was repaired but still seem to be having the same problem, I phoned them to explain but just said they would need to replace the turbo! I have looked through some old threads and people have been advised that the N75 valve and maf are the most common problems but no one actually said that replacing these fixed the problem, has anyone had this problem and replaced these items to fix it?

 

[mty12345]

N75 is a possible cause so is a faulty DV, but i shouldn't think the maf would be at fault with those symptoms.
Take it to a different garage, a VAG specialist, as it's definitely not the turbo. That wouldn't be intermittent like you describe. They sound like one of those dodgy garages that just replace random parts until they find the cause, at £700+ for a turbo they are taking the p*ss though.

 

[mty12345]

Do you have vagcom? When you say loss of power, just for a couple of seconds or longer?

 

[ORS]

I don't have the results and the garage can't remember what they were, just said the faults reset. I'm looking at getting another vagcom done.
Some times it cuts out for a few seconds and some times the turbo won't kick in to start with then all of a sudden I get boost, change gear and it's gone again, some times just won't boost at all

 

[mty12345]

Getting the codes read again would be best, they sound like a waste of time if they didn't even write the codes down or save a copy of them.

If i had to guess without any codes, then it sounds like the most likely cause would be the DV (diverter valve) sticking open. Do you know if it is a standard DV or one of the aftermarket forge 007/8 ones?
If it's a forge one then they can be disassembled and cleaned. If it's a standard one then i'd remove it and test it to see if it sticks open.

 

[ORS]

Yeah, trying to get a shot of one and I'll get the codes.
I presume it's standard as there no mods to the car, I'll have a look at it and see what's happening.
Thanks for your help

 

[mty12345]

Thats ok mate, you're welcome. If you remove the valve then it should open when you apply vacuum to the top connection(connect a suitable bit of tubing and suck through it) and then spring shut again when the vacuum is released. It will have bosch written on it and be black plastic it if it's original, the forge ones are much more fancy and made of metal.

 

[ORS]

Just connected the diagnostics and no faults were showing, I'll try removing the valve and give that try.

 

[Will_s87]

Hi ORS -
Just seen your post and I believe we have a similar problem...
I was driving down the m6 the other night - maintaining about 70 mph. Suddenly my power just dropped and my car started to decelerate. if I let off and then re applied throttle the car picked up again and continued.
This happened a number of times over the next few days.
In the past 2 days it hasn't happened, so I'm going to take it up the motorway for a longer drive to see if I can replicate it.
It didnt seem to have any relation to speed or gear,
I was thinking it could be fuel pump related as I had a few issues with that recently..
I have ordered a replacement N75 from ebay, I'm gonna get a TB reset and boost test done soon.

best, W

 

[ORS]

I found the fault with mine, turns out there was a small tear in the silicone hose coming off the n75 solinod, not visible at first until I removed the hose, replaced the hose and all is fine now.

 

[rsconfusion]

I'm having the same issue and have done for a long time!! I am now running a manual boost controller with upgraded DV I get boost some times then other days just will not want to go just get a lot of DV noise any ideas would be much appreciated


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[Calumcjm]

Has the car been mapped? And does turning it off and on 'fix' the problem? I'm having the same issue too.
Other people seem to be suffering from it as well.
http://www.seatcupra.net/forums/showthread.php?t=435179

 

[rsconfusion]

Yes mine has been mapped but from previous owner. And thinking about it if I turn it of and leave it for a while it does seem to come back


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[Calumcjm]

Have a read through that link and see if that helps. There is no overall solution cause it could be a number of things ranging from a faulty n75 or dodgy map. Just a case of trial and error really which can cost a bit of money which is a pain.
Try scanning it for fault codes if you can because I get one for a pressure drop between turbo and throttle body

 

[Calumcjm]

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
P1297 - 35-00 -

I know for a fact that it's not my dv. So looks like we're in the same boat haha

 

[rsconfusion]

Any one in the norfolk area have decent vag com ?


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[rsconfusion]

I had a little play with my boost controller on the way home and I turned it down seemed to boost for longer and better but only if your driving like you a pissed of teenager as soon as you drive normally it seems to dump air and go back to being lazy could it be a over boost issue wich is cutting of the boost, or maybe a dodge wastegate flap not sealing


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[rsconfusion]

Hey guys may be some help I think I may have found the phantom boost issue! After getting very frustrated with the car dropping boost and loosing power I spent the day trying new things and replacing bits I found that the intercooler pipe that joins the pancake pipe and charge pipe (the one with the stupid clip and seal ring ) was leaking under full boost it was hard to hear and see at first but after sealing it and taking it out for a run it has been holding boost and not dropping!!

Now this might not be the case for everybody that has this issue but after having this issue for along time and had tried everything else it's a very easy and cheap test!

I also found the gaskets between the turbo one to the down pipe and the one to manifold was leaking to so replaced them so far I have had no issues I will be upgrading my stock intercooler for fmic to eliminate any future leak from the clip pipe

I hope this is some help and it sorts the problem everyone seems to be having
Good luck



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[Calumcjm]

That's good mate. I'll have a play around with pipes again to see if there is any leaks I might have missed. Was thinking of doing a pressure test as well.
Tbh mine hasn't done it a lot recently, only about 2/3 times in the past month which is good. I definitely think its something to do with the temperature cause it seems to happen more often if it's cold. Sounds a bit silly but

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