PD150 struggling to hold boost?

[COOPSTAR11]

Hi all and thanks for letting me on!

I've been using my pd150 for about a month now and all has been fine, bar a hiccup at the beginning as explained below. i was out tonight and while accelerating on the motorway i hit 5th and at around 2900rpm the car went into limp mode. It was as if i had no boost at all, thankfully it sort of held it's speed so i could pullover safely.

after a restart it was ok working it's way up the gears but obviously it's only firing through the first 4 quickly but once it has to hold the boost i.e in 5th and 6th limp mode starts again.
when i first bought the car i did plug it into VAGCOM and it read charge pressure control, not 100% on which deviation but i will have to plug it in again to find out.

This problem happened when i first bought it but after changing the MAF sensor for a Bosch replacement all was fine. So i'm thinking surely the new MAF cannot be knackered?

Sorry i'm not too clued up on parts etc but i'm trying lol.

Any help would be greatly appreciated,
Brandon.

 

[mty12345]

If that's one of the variable vane turbo models, then it's possible the vanes are gummed up and need cleaning. Get it on vagcom and see what codes you have.

 

[Thai-wronghorse]

The PD150 / ARL engine has the Garrett GT1749VB turbo which has variable vanes which notoriously get clogged up.
Other things to check are the EGR valve and intake manifold for crap build up.
It's also worth checking all of the joints on the boost pipes throughout as these are simply **** and leak for fun which in turn can cause limp mode as well if it's over boosting in attempt to compensate for lost pressure.

Sent from my SM-G930F using Tapatalk

 

[Rich-I-Am]

Would switching off/deleting the egr valve help with keeping the turbo clean internally?

Also an ARL owner.

Cheers

Rich

 

[chriswales6]

The variable vanes that get stuck are on the exhaust side of the turbo. The EGR system takes some of the exhaust gases (and soot) putting it back into the air intake. So while removing or turning down the EGR is advisable, the soot normally stays around the EGR valve and won’t have much impact on the exhaust.

I was getting over boost on the 110 TDI when I was mainly doing town driving. I got the turbo to self clean by ragging it along a quiet dual carriageway a few times. Holding it flat out in 4th or 5th for as long as I could. The past couple of years I’ve done over 200 miles a week on the motorway, this seems to get the turbo hot enough to burn off the carbon. Since I don’t often go above 3,000 revs but then I do it doesn’t go into limp mode.

 

[mty12345]

Loads of people have successfully cleaned their vanes using Mr muscle oven cleaner https://m.youtube.com/watch?v=56oIU-sF7d0

Edit there is another thread open about the same issue now too. http://www.seatcupra.net/forums/showthread.php?t=435289