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Volvo 850 power loss under hard acceleration Topic is solved

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

Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Thu Feb 07, 2019 12:56 pm

Thank you clemens i will

Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Fri Feb 08, 2019 1:37 am

I feel like boost goles Up ando then goles down a bit And remains a bit low, what can cause this?

Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Fri Feb 08, 2019 1:45 am

I think my tcv is leaking a bit

Cookeh
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Re: Volvo 850 power loss under hard acceleration

Post by Cookeh » Fri Feb 08, 2019 2:04 am

Boost leak would cause that sort of thing. TCV is a good place to start, as you said. Also check the vac lines on the turbo housings - I had two split here just last month.

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erikv11
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Re: Volvo 850 power loss under hard acceleration

Post by erikv11 » Fri Feb 08, 2019 8:55 am

Other very common causes of boost leak:
- the 20 year old hose on the IAC is cracked somewhere in it
- the 20 year old CBV diaphragm has hit the end of the road, too many flexes, look for actual holes (can see light through it) or lots of cracks where it flexes. Can be tested with a vacuum tester / brake bleeder.
- Intercooler path. So many hose/pipe junctions.
'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

Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Thu Feb 14, 2019 6:03 am

i did check all of that everything is ok, nothing leaking.
the boost is half way the white line every time till 5500 rpm then goes 3/4 white line.

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