1997 S70 'Red' Turbo Vacuum Line

Vuym · Post by **Vuym** » 15 Jan 2025, 14:23

Hi everyone,

I've recently picked up a cheap 1997 S70 T5. This is my second car & as a 19 year old I really do not have much mechanical experience at all so I may have jumped into the deep end here. Nevertheless, I'm excited to fail & learn from my mistakes. So far, I've replaced the rotor arm, distributor cap, ignition leads & spark plugs. I then found out that my (yellow) wastegate actuator vacuum line, (blue) fresh air line and (red) turbo compressor line are completely torn.

Replacing the yellow & blue was easy enough but I am really struggling to get access to the red vacuum line (turbo-side). Can anyone give me any advice? I'm guessing the turbo inlet tube probably has to come off as well as the engine turbo tube that comes over the top? Not too sure how to get that turbo inlet tube off, visibilty isn't great. Is there better access underneath the car, perhaps?

Any and all advice is greatly appreciated!!

Post by **scot850** » 15 Jan 2025, 19:03

Buy a cheap mirror on a bendy stick or adjustable stick to help you be able to see what you are trying to do. It is a pain to access that pipe as you have found out. Removing the turbo in pipe is definitely going to give you more room to work on this. It is still a challenge.

Welcome to MVS and hopefully we can help you alone the way.

Neil.

Vuym · Post by **Vuym** » 17 Jan 2025, 01:42

scot850 wrote: ↑15 Jan 2025, 19:03 Buy a cheap mirror on a bendy stick or adjustable stick to help you be able to see what you are trying to do. It is a pain to access that pipe as you have found out. Removing the turbo in pipe is definitely going to give you more room to work on this. It is still a challenge.

Welcome to MVS and hopefully we can help you alone the way.

Neil.

Thanks for the advice! I had a fiddle around and I can feel the 7mm bolt the holds the inlet tube in, I think I'm more worried about getting the inlet tube back on rather than off. Also have been reading that there are some brittle lines that run underneath the tube which from the PCV and often snap when removing inlet tube. I'm going to give it a go over the weekend and just hope I don't end up doing any extensive damage.

coop · Post by **coop** » 17 Jan 2025, 03:22

When I fixed mine I ended up cutting the line to where it was less brittle and splicing it as a temp fix. Then I blew an exhaust valve and never fixed it permanently

Post by **abscate** » 17 Jan 2025, 04:21

The red compressor hose is a tough one to get on with the snorkel in place. Get the air box out to get room, snorkel off, move slowly and carefully to avoid breaking stuff. You can splice in broken crankcase ventilation stuff on a -1998 , no need to buy new.

Post by **Sveedy** » 17 Jan 2025, 06:52

Removing the turbo inlet pipe clamp can be a royal pain. However when you go to reinstall it, orient the hose clamp so that it is facing upward, and you will be able to easily remove and reinstall it in the future from up top with a long 1/4" extension.

Vuym · Post by **Vuym** » 17 Jan 2025, 14:11

All the advice has been very helpful, thanks again everyone.

I ended up just splicing it as a short-term solution as the proximal end (closest to the turbo) was actually quite sturdy. I'm going to have to service the PTC at some point so I'm thinking of doing it then. In the meantime, I need to make sure my CBV to inlet manifold vacuum line isn't split either as there is a very obvious compression surge.. it's not underboosting so I'm hoping it excludes a torn diaphragm

Vuym · Post by **Vuym** » 18 Jan 2025, 06:02

So the 'green' CBV to inlet manifold looks fairly secure. It is a bit perished and old where it inserts into the CBV but I can't feel or see any obvious splitting of the hose, could a small leak from this cause an obvious flutter? The previous owner has put a K&N Cone filter on so I know that would amplify the sound. I've ordered new 3mm and 4mm silicone hosing anyways to replace.

Any other suggestions for what I need to check as to why it is making this flutter? Would it either be torn dipahragm or a weak spring? Diaphragm holes usually lead to underboosting right? I don't feel as though the turbo is making any inconsistent or low boost but I know this is a purely subjective thing. If the CBV needs replacing, I don't think I'll be able to do it myself and will probably have to take it to a garage

coop · Post by **coop** » 18 Jan 2025, 07:57

Check the line that goes to the fuel pressure regulator if the ones off the tcv look good.
It runs from one of the intake nipples to a hard line in the front of the engine under the intake tube that’s hard to see but that might have broken as well.

coop · Post by **coop** » 18 Jan 2025, 08:02

The 97 might be different then my 98 with the fpr setup but it’s a somewhat common issue to have a hose broken around there too. On the 97s I think they are by the back passenger wheel near the fuel filter. On the 98 they moved it onto the firewall