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Model specific boards => Golf mk4 => Topic started by: AntMk3GTi on 25 March 2013, 09:57

Title: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: AntMk3GTi on 25 March 2013, 09:57
Hi

I've just had my 1.8t AUM remapped to 205 bhp and it feels amazing to drive! I'm very happy with it, although every now and then I'll get a surge of boost as the turbo spools up then higher up in the rev range the power suddenly drops, almost feels like Iv'e taken my foot off the pedal and the turbo goes quiet, then it'll kick back in again.

I was told it's a sticking Actuator. I put a load of WD40 and a bit of grease on the push rod yesterday, and it's only happened once since then. Is there anythign else I can do while it's still attached to the car? Is it possible to replace the actuator from underneath the car with the turbo still in place?

This only happens very occasionally, and it doesnt take long to correct itself, but any help on how to stop it happening completely would be great!

Thanks
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Nino on 25 March 2013, 12:20
Hmmmm mine also does this same engine code too, I was told it could be the n75. But mine loses power top end but it dont come back like yours however my car is not remapped.
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: AntMk3GTi on 25 March 2013, 12:30

Thanks for the reply. I was just reading up on the N75 valve. I might try that and see how it is after.

Do you know which one I would need and the best place to buy it? Just after a standard replacement.

Cheers
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Nino on 25 March 2013, 13:33
http://www.ebay.co.uk/itm/181102476475?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 :cool:
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: AntMk3GTi on 25 March 2013, 15:06

Thanks  :smiley:
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: markallen on 25 March 2013, 22:06
Niño mines the same. I've put it down to the ecu only telling it to boost between 3000 and 5500 revs or something like that not sure on exact figures?
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Sonic B0000M on 25 March 2013, 23:33
Mine does this and wasn't sure why. I know I had a split vacuum pipe that got patched up and thought it was that.  But it still does it.
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Nino on 25 March 2013, 23:40
hmmm well i notice my car feels fast low down, then at around 4k rpm onwards seems to die down abit but speed still increases.
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Sonic B0000M on 26 March 2013, 22:41
Think mine is down to a split pipe.

Does anyone know if this will help? I too have 17705

http://pages.ebay.com/link/?nav=item.view&id=330671735043
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: Nino on 26 March 2013, 23:42
Quote from: Sonic B0000M on 26 March 2013, 22:41
Think mine is down to a split pipe.

Does anyone know if this will help? I too have 17705

http://pages.ebay.com/link/?nav=item.view&id=330671735043

Dont use them, I highly reconmend you use Creation motor sport, brilliant customer service and thats What I have use.
http://www.creationsmotorsport.com/products-by-category.php?main=6&catID=10
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: jimmyGIT on 27 March 2013, 08:07
Mine did this after remap,aum engine code btw.Changed n75 for new version and all was sorted,that was 3 years ago now cheers.Yes also as said above check those horrible inlet manifold pcv pipes, had a split in there aswel. :wink:
Title: Re: Mk4 1.8t AUM intermittent loss of boost
Post by: AntMk3GTi on 27 March 2013, 11:17

Cheers, Ive scanned it and got code 17963 Intermittent overboost.
I've checked the hoses around the N75 and they seem ok, new N75 has arrived so i'll fit tonight.

I got if from VW dealers so I assume they would've ordered the latest version available? didnt confirm whether it was F or E.  Is there a high chance that N75 is causing this code?

Thanks
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: Scott D on 27 March 2013, 11:49
could be a boost leak somewhere causing that code

might be worth getting a leak test done before buying an N75
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: Nino on 27 March 2013, 13:03
The n75 controls the boost to ensure that the car does not over boost. So my first thought would be a faulty n75. Fit your new one, clear the code and give it a few drives usually takes my car 2-5 days for codes to come back if I haven't fixed them.

Btw how much did it cost you from VW? And yes it would be the latest one look at the part number on the unit. It will ether end in J or E. if its E that's the most recent.

Boost leak would throw up 17705.
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: AntMk3GTi on 27 March 2013, 13:08

Can I clear the codes with VCDS lite?

It cost £75. But when I checked the part number he said it ended in A?! I knew that wasnt right so they've order the right part now that ends in E, he said it's the newer version from F.

Apaarantly N75 can refer to a few different valves so it didn't narrow it down enough. New one is on the way though, I'll fit it tomorrow.

Thanks
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: Dalo Harkin on 27 March 2013, 13:29
boost leaks leak oil, that's what you are looking for on any pipe that carries boost, there aren't that many, they come from the inlet manifold (boost ports are underneath) and the turbo/parts attached to the turbo.
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: xtetx on 27 March 2013, 16:00
could be charge pipe
Title: Re: Mk4 1.8t AUM intermittent loss of boost *Updated: Fault code 17963*
Post by: Nino on 27 March 2013, 20:29
Yea you can clear codes with VDS lite