methinks its time to do the PCV system!

[miltski]

i've had the lambda light on for some time now but the car's been running fine so i haven't really worried, i checked most hoses and changed most of them from turbo to manifold etc, however yesterday the car started boosting to only 7 psi which is about actuator i think, anyway whilst having a nose around the car i noticed in here:

http://farm4.static.flickr.com/3220/2709116809_53f39794b7_m.jpg

i found this:

http://farm4.static.flickr.com/3154/2709138253_5a4f5afa86.jpg

now i think the light could be on due to unmetered air getting in the inlet manifold, so i think its time to take the manifold off and replace the whole system.

question is, for the time being can i block off the bit that goes into the inlet manifold and let the other bit vent to air for the time being to allow the car to drive until i get the bits i need to do the pcv system?

[dooby]

Hiya,

a few of us were discussing this at the weekend as it happens. As a temporary fix, you could blank off both ends, i.e. at the end of the inlet manifold and at the other end just neat the turbo air intake. But you do need to block both ends, leaving either unblanked will allow unmetered air to either be lost or gained.

HTH, Pete

[miltski]

Hiya,

a few of us were discussing this at the weekend as it happens. As a temporary fix, you could blank off both ends, i.e. at the end of the inlet manifold and at the other end just neat the turbo air intake. But you do need to block both ends, leaving either unblanked will allow unmetered air to either be lost or gained.

HTH, Pete

couldn't i just block both bits of broken hose in the pic? that would be the same as both end wouldn't it?

[dooby]

Yep, that would be fine - sorry if I misunderstood you :-)

Cheers, Pete

[miltski]

hmm actually might see if i have any silicone hosing big enough to put over both bits ie rejoin them......

if i can get my fingers in there to do it lol!

[dooby]

Very long nosed pliers were what Tim recommended.

I did it when I had the inlet manifold off anyway but I wouldn't want to do that just for the elbow if I could help it...

Beware the other, thicker pipe can be a bit brittle so possibly best to leave it in place than try and separate them.

Cheers, Pete

[miltski]

ok quick temp fix update:

heres the inlet manifold side:

http://farm4.static.flickr.com/3149/2709431687_d5ece71746.jpg

an turbo inlet end, but if you look close you can, as i did, see a crack all round the big pipe that goes into the elbow, and it moves!!!!


so more air getting in after the filter and MAF, looks like this temp fix is really going to have to be temp!

http://farm4.static.flickr.com/3008/2709442557_e0fb61a65e.jpg

[dooby]

Interesting, a different person I was talking to last weekend also had a very similar problem at the turbo intake end with that part of the pipe! It was a later model car, but the same failure point.

I think there is meant to be a visible crack as I think the temperature sensor to enable or disable the PCV slots in and is replaceable but you might want to check if it looks airtight.

You might get away with silicone sealant around that area if you can get the pipe off and give it a good clean.

HTH, Pete

[tomtyres]

That amount of extra air shouldn't make any difference?
I have made a breather by-pass system for my t5, with a rally style oil trap.
The original breather to intake feed has been left open, with no difficulties whatsoever.

I know it's not `ideal` but the car only stands me in 342 pounds! ( e-bay :) ).

The 2 things which cause probs are vacuum leak and boost leak.

Any extra pre-turbo air should be fine!
Mines still raging on like a goodun! :)
It's a budget-rocket aimed at embarrasing my mates subaru's and evo6's!
It's doing a damn good job so far! :)

[Jod T5]

The emmisions light (lambda) is illumiated because you are losing metered air not gaining unmetered air...
Whilst the PCV system looks a very basic idea it is infact quite clever in the way it uses the turbo to suck on boost and the vacuum created at idle to recirculate the oil particles away into the atmosphere...
I would not recomend blocking your system at either end. As a temporary measure why not run some 4mm samco from the inlet, under the fuel rail, round the block, under the dizzy and onto the pcv valve....
It does sound like your system has seen the best days so i would budget for a new system... http://www.volvoforums.org.uk/showthread.php?t=46946
Cheers
Jod