'98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by **RickHaleParker** » 18 Mar 2018, 07:15

Now, however, I have the problem that this part is almost inaccessible for me.

Did you check accessibility from under the car?

SvenGWK · Post by **SvenGWK** » 18 Mar 2018, 07:52

No, not yet. I have no way to lift the car. So I asked. It would be a pity to rent a lifting platform in a self-help workshop only to find out that i can't reach it from below.

Post by **scot850** » 18 Mar 2018, 08:31

If it is the hose from the TCV as you say to the bottom of the TBV it can be done from the top but is fiddly. A small mirror on a stick is handy to see what needs done, The pipe uses a spring clamp on it and the job needs to be done by feel.

Neil.

SvenGWK · Post by **SvenGWK** » 18 Mar 2018, 08:51

Unfortunately, I have a screw clamp on there. I guess the bad accessibility will probably be the reason why it wasn't reasonably tightened. I can borrow a "workshop mirror" with illumination at work. Let's see, maybe I can get that fixed myself.
Thanks for the advice!

Post by **scot850** » 18 Mar 2018, 15:07

If the pipe is loose on the tube out from the CBV, then I would consider changing the tube altogether with the correct rubber hose to get a tight grip on the tube. The small diameter probably means the type of screw clamp can't pull tight enough at that small a diameter and hence the leak. I am happy to be corrected, but that pipe pulls a vacuum so any leak will prevent the CBV getting the vacuum to activate fully.

Neil.

SvenGWK · Post by **SvenGWK** » 21 Mar 2018, 12:54

We exchanged it, but unfortunately it had not led to the desired effect yet.
Today I listened again to the running engine and discovered a hiss near the servo pump. A few minutes later I discovered some smoke with my torch light.
Well, what can I say: I had the suspicion that something was done wrong when changing the oil trap. On the left side of the intake manifold is a small hose connection from which the oil mist came. I also found the corresponding hose. It was not possible for me to connect it now due to the boiling hot cooling water pipe and the hot intake manifold, but I think tomorrow I will have a well running car again!

Can someone explain to me what exactly the small hose has for a function and whether a hose clamp is foreseen to secure it?

: hose.jpg (100.49 KiB) Viewed 2234 times

Post by **erikv11** » 21 Mar 2018, 18:05

That small hose and nipple are part of the PCV system, it is infamous for the hose to fall off due to various reasons including just rotting away. Almost always throws a p0172 however, with the car otherwise running pretty normally. Hopefully there aren't other hoses or parts disconnected. Or maybe the Torque app is giving you there wrong code.

A hose clamp is not necessary, but it has one from the factory. A zip tie works well in there. Get some very long nose pliers to help you with the install.