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Model specific boards => Golf mk4 => Topic started by: Tezmax on 05 May 2014, 22:05

Title: Turbo or boost fault?
Post by: Tezmax on 05 May 2014, 22:05: Is my Turbo on its way out as when boosting up through 2nd and third i feel it loosing boost for a split second then picks up ok.

In top gear its alot more noticeable, like 50/50 boost no boost.

I have no fault codes.

Are these poorly turbo symptons or should i be be looking at other things...

Thanks for support in advance.
Title: Re: Turbo or boost fault?
Post by: rio_gti on 05 May 2014, 22:27: Possibly n75 playing up
Title: Re: Turbo or boost fault?
Post by: Tezmax on 07 May 2014, 18:14: cmon guys,
got a problem and only get one hit!

(thx Rio) wouldn't a N75 issue throw up a fault code? but will put it on the replace list.

Anymore ideas regulars?
Title: Re: Turbo or boost fault?
Post by: dom on 07 May 2014, 18:20: Is the boost spiky? As in on/off/on/off/on/off etc?
Title: Re: Turbo or boost fault?
Post by: Tezmax on 07 May 2014, 19:34: Yes, on/off 2 or three times through 2nd and third while excelerating, and even worse when in 5th?
Title: Re: Turbo or boost fault?
Post by: MoMartin on 07 May 2014, 19:49: I have this problem apart from my car throws the fault code
00575 - Intake Manifold Pressure
08-10 - Control Limit Surpassed - Intermittent

I have replaced the n75 valve too and that didn't make any difference
Title: Re: Turbo or boost fault?
Post by: dom on 07 May 2014, 20:38: Quote from: Tezmax on 07 May 2014, 19:34
Yes, on/off 2 or three times through 2nd and third while excelerating, and even worse when in 5th?

I would guess N75 then
Title: Re: Turbo or boost fault?
Post by: brewey on 08 May 2014, 19:01: Have you services you DV? Mine did this when the standard one split.
Title: Re: Turbo or boost fault?
Post by: Tezmax on 09 May 2014, 17:34: Quote from: brewey on 08 May 2014, 19:01
Have you services you DV? Mine did this when the standard one split.
I have a Forge 007p which i cleaned and greased up when i first got issues but didn't make any difference.
I have a standard DV i can swap to see if it helps coz thats an easy 5min job.

Thx Brew.
Title: Re: Turbo or boost fault?
Post by: Tezmax on 23 June 2014, 21:11: Changed the N75 and swapped my recirculating valve but made no difference.

I now get next to no boost in 4th and 5th, it almost feels like its in limp mode?

Anymore ideas?

Thanks.
Title: Re: Turbo or boost fault?
Post by: harlemex on 23 June 2014, 23:00: mine did this and it was my maf.
Title: Re: Turbo or boost fault?
Post by: MoMartin on 24 June 2014, 11:24: Quote from: harlemex on 23 June 2014, 23:00
mine did this and it was my maf.

This

Edit - well the fault code was maf the boost spikes were throttle body i believe (as nino suggested)
Title: Re: Turbo or boost fault?
Post by: Dalo Harkin on 24 June 2014, 12:16: may also be worth cleaning the throttle body in case its sticking
Title: Re: Turbo or boost fault?
Post by: Tezmax on 25 June 2014, 10:29: Maf changed but made no difference. Will clean throttle body this afternoon and see how it goes. Got no vagcom to realign though. Whats the symptoms if TB adjustment required?

Thanks.
Title: Re: Turbo or boost fault?
Post by: daddy5x on 26 June 2014, 22:09: should realighn its self after a few miles
Title: Re: Turbo or boost fault?
Post by: dom on 27 June 2014, 17:45: Quote from: daddy5x on 26 June 2014, 22:09
should realighn its self after a few miles

No it won't. His is an AUM which needs realigning with VAGCOM.