help needed asap boost problems???

[SEATCOOBER]

just fitted my laguna fmic have had it runnin ok for two weeks now i have a boost problem, put my foot down boost gauge gows to 1.3 bar very well and boosts as normal, holds the boost for like three seconds then looses all the pressure reads 0 bar with foot flat and runs like a bag of ****. ive checked all my fmic pipes and everythin seems fine no cracks or splits. whats going on any one got any ideas i refuse to take it to a garage unless i have to!!!!!!!!!!!!!

 

[Kevgrady]

Check all the vacum pipes espacially the one going into the top ov your DV ive just had the same problem!

 

[chris999]

n75? dodgy maf?

 

[SEATCOOBER]

how can i rule these out and would these affect the boost this badly changed dv to standard one pipe is ok and connected properly!!!!!!

 

[chris999]

well if you do not have vag.com then it is just a case of rule them out really that is what i have done in the past! i have a diagnostic kit, you are not that far from me either. i am sometimes in lincoln. what colour is your cupra?

 

[SEATCOOBER]

i have vag com but am a total biff with computers and dont know how to use it? my cupra is silver same as yours!!!!!!!!!!

 

[SEATCOOBER]

i drive through kings lynn every weekend on the a17 do you live near the big round about where the industrial estate is where franky and bennies is the one that joins you 2 the a47 if your going to norwich?????

 

[pdcupra]

i have vag com but am a total biff with computers and dont know how to use it? my cupra is silver same as yours!!!!!!!!!!

common colour chris isnt it? everyone seems to have silver
if you know anyone in the area who has a cupra you could swap n75 and see then?

 

[pdcupra]

i drive through kings lynn every weekend on the a17 do you live near the big round about where the industrial estate is where franky and bennies is the one that joins you 2 the a47 if your going to norwich?????

chris lives just off the A17 mate, you wont be far from him at all if your on the A17.

 

[SEATCOOBER]

im about 40 mins from kings lynn but will be woth it if he can find my fault, n75 what is this what does it do, exspensive?

 

[Spud_G40]

I have the exact same problem still, I have a new maf, new N75f, new thrust sensor, and still mine has the same problem as you, checked all vac hoses today all ok.

Its either my forge DV is gubbed or Actuator has a burst diaphram i've been told??

 

[Ninja]

could try bypassing the n75 valve ? that resolved a few boost 'issues' for me...

try checking all the smaller hoses for leaks as well as the main intercooler piping as you may have a leak somewhere ?

 

[SEATCOOBER]

how do you do that then?

 

[acidstrato]

bypassing the n75.....dont think you did that Dan mate, you thinking of the N249??

vagcom logging would be best answer though since you have it

 

[chris999]

yeah i am 5 mins away from that big round about. pm me your mobile number and we can sort something out mate.

 

[SEATCOOBER]

lol i have vag com and the OBD 2 cable but have no idea how tgo use it!!!!

 

[SEATCOOBER]

will your kit diagnose it mate?

 

[chris999]

it will indeed. and it wil erase the fault codes etc aswell.

 

[SEATCOOBER]

there are is no managment light on so will there be any codes?

 

[Ninja]

bypassing the n75.....dont think you did that Dan mate, you thinking of the N249??

vagcom logging would be best answer though since you have it

doh yep your right there!