7 replies to this topic

[Ludeless]

I was in the process of replacing some of my rubber vacuum hoses w/ silicon ones and noticed this one hose not attached to anything on one end



It's the one in the middle here. It looked to me like it should attach to the Air intake as there was a nipple there on the underside of the hose after the MAF sensor.... Looks like it would fit this hose. Anyone know if this should be attached?

Here's a pic of the underside of the intake hose.



Thanks

[Curtis G]

Sure hook it up, looks like it goes there.

[Detailsetc.]

Yes it does belong there, maybe a good time to put a ziptie on it as well.

[Ludeless]

Thanks for the help... hooked it back up w/ ziptie goodness and the car seems to run so much better. I used to get a loud whistle type noise right for about 1-2 seconds after the car was first started but no more.

Something strange has happened a couple times that i haven't noticed before when putting the pedal to the floor. It's only happened maybe 25% of the time, but when i do this, the turbo kicks in and everything is great. But all of a sudden it's like the turbo or something just stops. There is absolutely no accelaration for about a second or 2. Kind of like what would happen when you hit a governor for top speed. Not sure if this is from the turbo, or the fuel cutting off or what....

Any ideas?

[MrWinkey]

That hose is nothing but relief for the boost....consider it a recirculated dump valve...instead of a blow off valve dumping it outside it dumps it back into the intake

[prasamin]

that will throw off vac readings and gas mileage I believe though.

good to hook it back up, or you could just plug it up on the pipe side and the BCS side and be done with it.

[SIAMBLUE]

Has anyone got a picture or a diagram or details where the hoses go, of the newer style bcs found on the s70's?


regards gary.

[PullMyFinger]

There should be a sticker on your hood or firewall, passenger side that details very clearly where all the vacuum lines go. Very thoughtful of Volvo to put that there, I've used it several times now.