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850 t5 r turbo problems

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

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850 t5 r turbo problems

Post by Nicholls39 » Fri Feb 07, 2020 12:46 pm

Hello everyone
Turbo gauge wont pass more than 3/4 of the way around when accelerating. The car also starts to accelerate fast then surges almost like its hitting a limiter.
First component to look at?

I've not had the car long so dont know what has been replaced in its history.

Any advice would be massively appreciated

Cheers in advance.

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Re: 850 t5 r turbo problems

Post by Sveedy » Fri Feb 07, 2020 7:02 pm

I think I'd first check your rubber intercooler hoses. I've heard that when they get old and soft, they will partially collapse when the turbo kicks in, basically clogging everything up.
" There is enough in the world for everyones' needs, but not enough for everyones' greed. "

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Re: 850 t5 r turbo problems

Post by jreed » Sat Feb 08, 2020 6:23 am

I agree with the above advice. In addition, it might be a good idea to check all the rubber vacuum lines, in particular those connecting to the boost control solenoid / turbo control valve.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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Re: 850 t5 r turbo problems

Post by erikv11 » Sat Feb 08, 2020 3:35 pm

And if those checks don't solve the problem, check the CBV diaphragm for tears, especially if it's never been changed. I actually might even look here first if it wasn't such a PITA to check. The hoses are easy and should definitely be inspected.
'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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Re: 850 t5 r turbo problems

Post by magna224 » Sun Feb 09, 2020 1:56 am

I was under the impression that 3/4 was how far it is supposed to go on a stock car. Is that not correct?
Volvo 855 T5 1995
Volvo 854 T5 1996
Toyota MR2 1987

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Re: 850 t5 r turbo problems

Post by Clemens » Mon Feb 10, 2020 2:24 pm

Worn ignition components can cause that. Are your sparkplugs, wires, distributor and cap OEM quality and pretty newish? if not, this can cause erratic behaviour like you mentioned.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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