Author Topic: Guide to removing / bypassing the N249 valve.  (Read 60150 times)

Offline Rhyso

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Re: Guide to removing / bypassing the N249 valve.
« Reply #20 on: 10 June 2009, 15:01 »
iv got a AGU 98 mk4 will mine have it den?? iv got a forge splitter d/v with no probs

no

Offline navmk4gti

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Re: Guide to removing / bypassing the N249 valve.
« Reply #21 on: 10 June 2009, 15:21 »
oh k ryhso confirmed it i belive him i dont need to go out in the rain and check then  :laugh:
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Offline northeast_gti-t

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Re: Guide to removing / bypassing the N249 valve.
« Reply #22 on: 14 June 2009, 22:27 »
but arent there any side effects after doing this..future problems??? 

It's clearly been put there for a reason, but the fact that the earlier Mk4s did without the valve is reason enough for me to bypass it!

I've not experienced, or read of anyone else having problems as a result.
same here and mine seems to run much better than it did with all those valves pipes and crap in the way  :laugh:
2000 Mkiv GTi 1.8T AGU

Offline davetec-s

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Re: Guide to removing / bypassing the N249 valve.
« Reply #23 on: 21 June 2009, 20:17 »
nice guide! gonna try it when my 3mm vacuum tubes and the t-piece turns up. forge sell a secondary intake system blanking plate?? whats this about an is it needed?
« Last Edit: 21 June 2009, 20:19 by davetec-s »

Offline northeast_gti-t

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Re: Guide to removing / bypassing the N249 valve.
« Reply #24 on: 21 June 2009, 22:57 »
nice guide! gonna try it when my 3mm vacuum tubes and the t-piece turns up. forge sell a secondary intake system blanking plate?? whats this about an is it needed?
iirc BaV is/has done this mod also pm him the sai is only a pre heater to warm the cat up quicker on start up for emissions etc i think somebody on the cupra forum has done this also i'm thinking of removing mine  :undecided:
2000 Mkiv GTi 1.8T AGU

Offline BaV

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Re: Guide to removing / bypassing the N249 valve.
« Reply #25 on: 21 June 2009, 23:20 »
I removed mine last week and will be putting it back on this week.

From my experience i Would not reccomend it to anyone. Car seems more jolty when accelerating, failed emmissions test! And the car still ticks over higher on a cold start so not really sure what it does lol. A lot of unburnt fuel was coming through on the emmisions test so i have a feeling this pump is always doing something. And also even if u put a resistor in the pump harness you still get a sai incorect flow fault code and engine management light.

So for anybody thinking of doing it i wouldnt bother!

Offline davetec-s

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Re: Guide to removing / bypassing the N249 valve.
« Reply #26 on: 23 June 2009, 17:00 »
i bought 3mm vacuum tube from forge and its much too small! the internal size of it is 3mm apparently but it wont go onto the top of my splitter valve. anyone help me? thanks

Offline GregUK

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Re: Guide to removing / bypassing the N249 valve.
« Reply #27 on: 23 June 2009, 17:01 »
i bought 3mm vacuum tube from forge and its much too small! the internal size of it is 3mm apparently but it wont go onto the top of my splitter valve. anyone help me? thanks

Rub a bit of washing up liquid onto the nozzle to help the hose to slide on.

Offline davetec-s

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Re: Guide to removing / bypassing the N249 valve.
« Reply #28 on: 23 June 2009, 17:37 »
is it fine to use the 3mm tho?? looks a bit smaller than the original so i dont wanna risk running the wrong size vacuum pipe an breaking something lol.

Offline davetec-s

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Re: Guide to removing / bypassing the N249 valve.
« Reply #29 on: 23 June 2009, 23:13 »
did the bypass anyway using the guide (which is spot on by the way :D) and im not too sure.....i got the splitter valve on mine an with my induction kit it used to go tsssshhhhh pretty loud an at the exact time i released the throttle, now there isnt a particular noise that it makes it just does what it wants and it does it whenever if feels like really!! not regretting it really because it doesn seem like any power loss but ive lost the noise that i luuuuuv! any help??