N249 valve causing boost problems 20vt 1.8 auq

[Mrwebster]

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?

[Dalo Harkin]

have you checked the injectors ?

[Mrwebster]

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

[Mrwebster]

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

[eddie_t]

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

[Dalo Harkin]

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

[Mrwebster]

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

[Mrwebster]

anyone got anymore suggestions?

[JimBR]

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.

[Mrwebster]

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