damn

[urquattro-island]

driving to work today my car startet jurking, when hitting 0,5boost. fast on and off like. can anyone relate to this?? Its like fuel no fuel, fuel no fuel, fuel no fuel....

[S2central.net]

FP relay ?

Check connections to FP if you can.

Any fault codes showing ?

[s2driveruk]

that sir is a boost leak, is it quite violent with it?

[urquattro-island]

it is

°very violent, like swithcing ignit. on and off with 1sec in between
paul, Where is the Fuel pressure relee??

[s2driveruk]

yep, i reckon you need to check all your intake plumbing, starting at the turbo and following it round to the IM. Top candidates for split hoses are the two leadind up to the pipe running over the rocker cover in my experience.

Good luck locating it.
Cheers
David

[Ski]

lots of things can cause this issue (overboost protection), like a leaking boost pipe, wastegate spring too hard etc..

PITA to diagnose. I would first inspect the boost pipes to see if youc an spot something obvious (like a big crack).

[urquattro-island]

ok

will have a go at it, thought it could be the old hoses. they blew on my urs4 also, stragiht after i chipped it...

[urquattro-island]

yes

lots of things can cause this issue (overboost protection), like a leaking boost pipe, wastegate spring too hard etc..

PITA to diagnose. I would first inspect the boost pipes to see if youc an spot something obvious (like a big crack).

i recon it will be some searching, i have a 2,5bar map and original wastegate spring.

[S2central.net]

haha - recently chipped 3B on ancient hoses - yes I'm with Dave on this for an air leak and quite a big one by sounds of it.

[urquattro-island]

eeehh

yes think my hoses are old, (read original 250 000km old)

[urquattro-island]

well

thanks guys found the leak, and ordered new samcos. (thanks paul) it was the short hose between the pipe from intercooler onto pipe leading to trhottle body...

[s2driveruk]

glad you found it

[urquattro-island]

thanks

will be great to get the samcos...

[dest]

How did you get access to the hose that had the problem?
I have the same symptoms as you, but havent checked that hose yet as I didnt know what the best way was to remove it

[S2central.net]

Those two short sections at the lower pressure pipe on the 3B get a lot of engine movement - I've seen those split on a few 3B engines. Those are reasonably simple to bodge a temporary fix.

Sometimes the throttle body hose is first to go.