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  1. #1
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    97 V70r turbo/boost issue

    Symptom: - Stage 1 remap that boosted well to around max 13psi. Over the last couple of days, it's started boosting to around 6psi only and a fairly audible whooshing/rush of air noise is heard on deceleration. It never did that before and it doesn't do it on acceleration, oddly. The car is fitted with an analogue boost gauge, connected to the vac tree.

    I have replaced and done: A vac smoke test and replaced all perished hoses. I have fitted a new OEM Pierburg TCV and a Forge Motorsport Diverter/recirc valve.

    I will be checking my wastegate arm/movement tomorrow as a next step. Any pointers appreciated.
    Last edited by Muzzleflash; Monday 16th July 2018 at 10:36.

  2. #2
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    You're on the right track, check all the hoses, wastegate, etc.

    Things to watch out for are breaks in hoses that are hidden, once had a tear in the hose from the intercooler to the throttle body but it was around the back of the pipe and wasn't at all obvious even when pressurising the system with a compressor (could hear it but not see it).

    And check the intercooler isn't leaking as the plastic tank ends can break.

    Also there is a couple of check valves that form part of the emissions system, one comes off the front of the manifold under the vac tree and is 8mm piping, the other comes off the same pipework and connects onto the turbo inlet by the pcv valve. The flap inside the check valves disintegrates and lets the boost out.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.

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    Quote Originally Posted by Dangerous Dave View Post


    Also there is a couple of check valves that form part of the emissions system, one comes off the front of the manifold under the vac tree and is 8mm piping, the other comes off the same pipework and connects onto the turbo inlet by the pcv valve. The flap inside the check valves disintegrates and lets the boost out.
    Now this got my antenae tuned, as it's basically the last vac pipe I need to replace. The garage smoke test highlighted two tiny pin holes in other pipes, which were rapidly replaced - but as it didn't cure the problem I decided to replace the rest myself. Where are those plastic check Valves available from??

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    Just in case you don't already know, but when checking the intercooler you will/should find a small leak as the std intercooler has a small drain hole in it, but as Dave has said the end caps can crack and leak after time.

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
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    I disconnected one of those plastic check Valves and blew into it. It will take air either way, so presumably it's fecked. Was going to replace with aluminium ones, but the OEM versions have 8mm outlet and 11mm inlet. Very odd, but very difficult to get so it seems. I guess Ovlov only??
    Last edited by Muzzleflash; Tuesday 17th July 2018 at 11:10. Reason: Spelling

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    That could be the answer to your problem then, they are available from volvo and do cost a bit for a plastic valve, order from FRF Swansea and you should be able to get them for a sensible price using the discount code, which for the life of me I can't remember, search it here or someone will probably be kind enough to post it here on this thread. Hope this solves your boost issue.

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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    Quote Originally Posted by MoleT-5R View Post
    That could be the answer to your problem then, they are available from volvo and do cost a bit for a plastic valve, order from FRF Swansea and you should be able to get them for a sensible price using the discount code, which for the life of me I can't remember, search it here or someone will probably be kind enough to post it here on this thread. Hope this solves your boost issue.
    Thanks - somebody over on the Facebook forums said he tried to get them from Volvo recently but they are now discontinued. No matter, I have ordered some 10mm ally ones off Fleabay cheap and will give those a go before attempting to source something better (if)

    Reckon I should be able to stretch 8mm vac pipe over a 10mm nipple...

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    Quote Originally Posted by Muzzleflash View Post
    I disconnected one of those plastic check Valves and blew into it. It will take air either way, so presumably it's fecked. Was going to replace with aluminium ones, but the OEM versions have 8mm outlet and 11mm inlet. Very odd, but very difficult to get so it seems. I guess Ovlov only??
    That would probably be it

    I did try to get some from Volvo some years ago and just for one check valve it was 49.

    Quote Originally Posted by Muzzleflash View Post
    Thanks - somebody over on the Facebook forums said he tried to get them from Volvo recently but they are now discontinued. No matter, I have ordered some 10mm ally ones off Fleabay cheap and will give those a go before attempting to source something better (if)

    Reckon I should be able to stretch 8mm vac pipe over a 10mm nipple...
    I got some 8mm inlet/outlet aluminium fuel check valves off ebay for about 3 each and bought some 8mm black silicon hose as the original stuff was perished anyway. Then stretched the 8mm hose onto the T piece after the valve, has been fine for the last 8 years.

    Fingers crossed this is the problem
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.

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    Quote Originally Posted by Dangerous Dave View Post





    I got some 8mm inlet/outlet aluminium fuel check valves off ebay for about 3 each and bought some 8mm black silicon hose as the original stuff was perished anyway. Then stretched the 8mm hose onto the T piece after the valve, has been fine for the last 8 years.
    Thats exactly what I plan to do - except I bought 10mm valves and both 8 & 10mm vac hose
    We shall see..

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    Should be fine
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.

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    Had mine a year our so ago for the 850 with no problems, just need a good parts dept, frf should be able to source these valves at a sensible price, as like Dave I paid a premium from volvo for these..

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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    To be honest, im not convinced replacing these will solve the issue - hence for now Ill buy cheap ones and hope for the best! I mean how and why would these cause a fairly audible 'whoosh' on decelerating?? ��

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    Just a thought if you still run the original by-pass valve on the turbo, check if the diaphragm is not split or broken, that could possibly give the whoosh you mention and would also cause a loss of boost.

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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    Quote Originally Posted by MoleT-5R View Post
    Just a thought if you still run the original by-pass valve on the turbo, check if the diaphragm is not split or broken, that could possibly give the whoosh you mention and would also cause a loss of boost.
    I replaced it less than a week ago with a Forge Motorsport one. Didn't make any difference, unless I fitted it wrong?? ��

    Edited to add: This one :- https://www.forgemotorsport.co.uk/Re...duct--787.html
    Last edited by Muzzleflash; Friday 20th July 2018 at 14:26.

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    I also meant to ask what vac readings (in/hg) people are getting with a known good system on tickover??

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    I usually get around 19in/hg at idle
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.

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    Quote Originally Posted by Dangerous Dave View Post
    I usually get around 19in/hg at idle
    I'm getting between 20-23 in/hg dependant upon engine temp (no frills analogue vac/boost gauge).

    Those NRV's have only just turned up in the post and I won't have time to fit them until middle of next week.

    Am also going to pull my wastegate line off the actuator and tenatatively see what boost I get then.... ��

  20. #18
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    Just been out and mine was reading 21in/hg at idle on a hot engine
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.

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    Quote Originally Posted by Dangerous Dave View Post
    Just been out and mine was reading 21in/hg at idle on a hot engine
    So I'm getting that, even with the knackered valves. Hmmm..

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    Don't forget the one way valves allow flow into the manifold when under vacuum so the reading would be the same even with dodgy valves.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, Arduino data display, Active exhaust control. Follow the project here
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.


 

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