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Model specific boards => Golf mk4 => Topic started by: Mrwebster on 15 August 2012, 22:11

Title: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 15 August 2012, 22:11

Anyone experienced a faulty valve??
bucking and surging at 3000rpm

no fault codes on vagcom,  new sparks   new coils  new maf  new foorge 007p  new bosot sensor,  new air intake temp sensor,  new N75 valve still not cured,

i traced the vaccuum hose back to this valve  (N249)
unplugged it and it runs alot smoother but still bucks / hesitates,  could this be the culprit?
anyone experienced similar?

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Dalo Harkin on 16 August 2012, 08:43

have you checked the injectors ?

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 16 August 2012, 09:42

the injectors seem fine, i believe that would cause a misfire and bring afault code if an injector was down, this is purrely a boost related issue

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 16 August 2012, 11:34

did the bypass, cars alot more responsive but still in 2nd gear it jerks / lags / fails to boost.. then let off the throttle it catapults back into chair and goes again?    have replaced almsot every single thing related to boost, checkd hoses numerous times, replaced anything susicious,  now out of money so selling it as spares / repairs

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: eddie_t on 16 August 2012, 12:32

Were all the sensors you've replaced OEM or cheap ebay/ECP items?

Cheapo electronics can cause all sorts of weirdness, much like what you're describing

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Dalo Harkin on 16 August 2012, 13:09

if your not getting the fueling, you wont be going anywhere above 3k

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 16 August 2012, 15:41

All genuine from tps. Cost me a fortune.  Been advised it could be the turbo due to high mileage   Doubt it's fuel as sometimes it's fine sometimes it's not

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 17 August 2012, 23:31

anyone got anymore suggestions?

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: JimBR on 17 August 2012, 23:50

Book it into R-Tech for a full health check to identify the problem instead of buying part after part hoping it'll fix it.

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 18 August 2012, 15:32

Cured it!  Turbo was sticking.   New k04 And manifold fitted  now to map it up :)

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Wazzzer on 18 August 2012, 15:45

what was sticking on the turbo mate?

Title: Re: N249 valve causing boost problems 20vt 1.8 auq
Post by: Mrwebster on 19 August 2012, 09:48

I presume the shaft was sticking on the bearing.  It is coked up and oil wasn't helping, seemed to have a tight spot