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Volvo 850 T5 boost issue

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

dennisye
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Volvo 850 T5 boost issue

Post by dennisye » Thu Dec 19, 2019 8:08 am

Hello guys,

I have a question about my 1994 855 T5. I replaced the TCV because I had almost no boost (the meter only just went into the white). The first couple days everything was amazing, boost went 2/3'rds into the white on the meter, throttle response was alot better and the car became alot faster.

But this week I'm feeling almost no boost, although the meter still shows it's going 2/3'rds into the white.

Things I´ve checked or done:
-Play on turbo shaft
-State of turbo
-Replaced all vacuum lines
-Replaced TCV with new Pierburg one
-Replaced wastegate membrane
-Replaced PCV system

I just find it very strange, the boost gauge in the car reads full boost but the car feels as if it isn't boosting at all (or very little), anyone know what to check next?

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matthew1
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matthew1

Re: Volvo 850 T5 boost issue

Post by matthew1 » Thu Dec 19, 2019 8:29 am

Wow, you've done all the Usual Suspects.

However...
The first couple days everything was amazing, boost went 2/3'rds into the white on the meter, throttle response was alot better and the car became alot faster.
This makes me think you blew something off. A vac line. Did you do your list before or after the first couple days?

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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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volvolugnut
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volvolugnut

Re: Volvo 850 T5 boost issue

Post by volvolugnut » Thu Dec 19, 2019 8:39 am

The pressurized intake tube from turbo to intake may be loose. The extra boost you enjoyed, may have partly blown off the tube. Just reposition and tighten the clamps.

volvolugnut
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matthew1
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

dennisye
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dennisye

Re: Volvo 850 T5 boost issue

Post by dennisye » Thu Dec 19, 2019 10:03 am

matthew1 wrote:
Thu Dec 19, 2019 8:29 am
Wow, you've done all the Usual Suspects.

However...
The first couple days everything was amazing, boost went 2/3'rds into the white on the meter, throttle response was alot better and the car became alot faster.
This makes me think you blew something off. A vac line. Did you do your list before or after the first couple days?

Hello from the US, thanks for joining.
Thanks for the reply,

Yesterday I replaced all the vacuum lines to the turbo, and that didn't solve the problem unforunately. None of those was loose either. Or could it be a vac line somewhere else. Because it's just not transfering all of it to the turbo.

dennisye
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dennisye

Re: Volvo 850 T5 boost issue

Post by dennisye » Thu Dec 19, 2019 10:07 am

volvolugnut wrote:
Thu Dec 19, 2019 8:39 am
The pressurized intake tube from turbo to intake may be loose. The extra boost you enjoyed, may have partly blown off the tube. Just reposition and tighten the clamps.

volvolugnut
Do you mean the one with the MAF sensor on it? I removed and put it back on yesterday to replace the vacuum lines. Didn't change anything unfortunately..

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volvolugnut
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volvolugnut

Re: Volvo 850 T5 boost issue

Post by volvolugnut » Thu Dec 19, 2019 10:26 am

I mean the large, about 2.5 inch (maybe 6 cm) tube from the turbo outlet to the intake manifold/ throttle valve. This tube will have the full turbo boost pressure and if end clamps are not tight enough, they will get loose or blow off completely. Also, check that the tube under the connecting hose has not been crushed and collapsed creating a leak for the boost pressure.
The small vacuum tubes should not get blown off, but may degrade over time.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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volvolugnut
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Re: Volvo 850 T5 boost issue

Post by volvolugnut » Thu Dec 19, 2019 10:27 am

Also check that the electrical connector to the TCV has not gotten loose.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

dennisye
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Re: Volvo 850 T5 boost issue

Post by dennisye » Thu Dec 19, 2019 10:29 am

volvolugnut wrote:
Thu Dec 19, 2019 10:26 am
I mean the large, about 2.5 inch (maybe 6 cm) tube from the turbo outlet to the intake manifold/ throttle valve. This tube will have the full turbo boost pressure and if end clamps are not tight enough, they will get loose or blow off completely. Also, check that the tube under the connecting hose has not been crushed and collapsed creating a leak for the boost pressure.
The small vacuum tubes should not get blown off, but may degrade over time.
volvolugnut

Okay thanks, I will check this first thing in the morning, I"ll let you know what happened.

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erikv11
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erikv11

Re: Volvo 850 T5 boost issue

Post by erikv11 » Thu Dec 19, 2019 10:31 am

He means the intercooler hose path, from the turbo through the intercooler to the throttle.

Edit: redundant now, you've got the answer up there.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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volvolugnut
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volvolugnut

Re: Volvo 850 T5 boost issue

Post by volvolugnut » Thu Dec 19, 2019 10:34 am

Thanks erikv11. That was not very clear on my post.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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