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Volvo 850 power loss under hard acceleration Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme »

Y squeezed the return Lane And the pressure kept the same, i think the pressure rise when i start the engine is caused because the alternator is giving a little more voltaje than batery does?
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Sommerfeldt
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Post by Sommerfeldt »

Jaumme wrote: ↑29 Jan 2019, 13:29 Y squeezed the return Lane And the pressure kept the same, i think the pressure rise when i start the engine is caused because the alternator is giving a little more voltaje than batery does?
That kind of brings us around to the pump again. Pressure should climb quickly with return line closed. If it doesn't that means replace pump.

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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abscate
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Post by abscate »

Pruned some posts that definitely were running low on lubricant.

Thanks for self moderating, people.
Empty Nester
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Jaumme
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Post by Jaumme »

Just replaced the fuel pump today And no more Power loss.
Thank you all for the help
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misha
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Post by misha »

I guess that pdf narrowed it down. :wink:
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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Sommerfeldt
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Post by Sommerfeldt »

Jaumme wrote: ↑01 Feb 2019, 14:20 Just replaced the fuel pump today And no more Power loss.
Thank you all for the help
Nice! Clemens got it spot on from the get-go. :mrgreen:

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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Jaumme
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Post by Jaumme »

Another question, is that boost normal or low? If its los what can cause It?
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Cookeh
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Post by Cookeh »

That's about as far as mine goes on the boost gauge, so Id be interested in knowing if its normal too!
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Clemens
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Post by Clemens »

Sommerfeldt wrote: ↑03 Feb 2019, 22:18
Jaumme wrote: ↑01 Feb 2019, 14:20 Just replaced the fuel pump today And no more Power loss.
Thank you all for the help
Nice! Clemens got it spot on from the get-go. :mrgreen:

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Summer: 1996 855 R
Winter: 1994 855 T5M
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Clemens
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Post by Clemens »

Cookeh wrote: ↑07 Feb 2019, 08:39 That's about as far as mine goes on the boost gauge, so Id be interested in knowing if its normal too!
That is quite normal for a T5, maybe a bit low. The R models go a bit further. And my T5M goes a bit further as well, but then drops back immediately because it has boost spikes.
you can always shorten the wastegate rod a bit (by like 1-2 turns the max.), but be careful because you can cause harm. Use a vac tool to set the base value of (I think) 1.8 psi for the M4.3 T5s and then shorten by about a turn. This wakes up the brick at low rps/speeds.

Please do some reseearch, I am writing based on my (confused) memories.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V
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