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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

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misha
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Re: Volvo 850 power loss under hard acceleration

Post by misha » Tue Jan 29, 2019 7:30 am

I don't get it...it should do the opposite.
How accurate is your pressure gauge?

Try to prime the system few times...key in pos.II...wait 2 -3 seconds...back to pos.I and imediately again to pos.II...Do that 3-4 times and watch the pressure on gauge.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

Jaumme
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Year and Model: Volvo 850 T5 1993
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Jaumme

Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Tue Jan 29, 2019 9:08 am

My pressure gauge is homemade with a Volvo truck oil pressure gauge but its supposed to be accurate

Jaumme
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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Tue Jan 29, 2019 9:22 am

I will block the return Lane now if the pressure os nota comming Up pump is dead And if It comes Up fpr maybe is stuck open?

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Re: Volvo 850 power loss under hard acceleration

Post by Jaumme » Tue Jan 29, 2019 9:26 am

I hace a theory Will confirm later when i do the test

Sommerfeldt
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Sommerfeldt

Re: Volvo 850 power loss under hard acceleration

Post by Sommerfeldt » Tue Jan 29, 2019 10:02 am

misha wrote: ↑
Tue Jan 29, 2019 6:48 am
Here we go again... :mrgreen:
Fpr is dictating what fuel pressure would be in the system...not the pump.
Fpr is vacuum controlled...that said....pressure varies as vacuum varies....Fuel pressure is not steady in all running conditions.
Here we go again. How about you pack up the smugness and read what I wrote, which is exactly what you peppered with .......’s and rewrote.

The pump WILL deliver 3 BAR because that’s what the pumps for these cars will deliver. If the pressure IN THE FUEL RAIL is different, then that’s NOT BEING CONTROLLED BY THE PUMP, or the pump has a fault. So pressure IN is going to be 3 bar, because that’s what the pump delivers. I never said it was static inside the fuel rail, but if the pump doesn’t deliver 3 bar, then something’s amiss.

Focus.....on.....reading...., and.... less.... on.... smileys...., .....misha..... :mrgreen: :mrgreen: :mrgreen: :mrgreen:

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

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misha
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misha

Re: Volvo 850 power loss under hard acceleration

Post by misha » Tue Jan 29, 2019 10:26 am

Just to be clear here...
Are you saying that pump alone will make 3bar pressure?
If you simply put a pump in the jar or can with fuel and supply it with 12v source....and it will squirt the fuel with pressure of 3bar out of the feed line?

Is that what you're saying?
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

Sommerfeldt
Posts: 1113
Joined: Tue Jul 29, 2008 1:25 pm
Year and Model: 1996 850 T5
Location: Oslo Area, Norway
Has thanked: 50 times
Been thanked: 30 times
Norway
Sommerfeldt

Re: Volvo 850 power loss under hard acceleration

Post by Sommerfeldt » Tue Jan 29, 2019 11:06 am

The Bosch fuel pumps supplied for the 850 has an operating pressure of 300 KPA, with a flow rate of 120 liters per hour. System pressure should be delivered from 50-60% of rated voltage.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

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misha
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misha

Re: Volvo 850 power loss under hard acceleration

Post by misha » Tue Jan 29, 2019 11:13 am

I didn't ask you that.
I know pretty good what spec they are.
Can you respond to my question please?
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

Sommerfeldt
Posts: 1113
Joined: Tue Jul 29, 2008 1:25 pm
Year and Model: 1996 850 T5
Location: Oslo Area, Norway
Has thanked: 50 times
Been thanked: 30 times
Norway
Sommerfeldt

Re: Volvo 850 power loss under hard acceleration

Post by Sommerfeldt » Tue Jan 29, 2019 11:24 am

I think I did - if you stick the pump inlet in a jar of fuel and turn it on, it'll spray out 120 liters of that fuel in an hour. So bring a big jar.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

User avatar
misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 49 times
Been thanked: 112 times
Serbia
misha

Re: Volvo 850 power loss under hard acceleration

Post by misha » Tue Jan 29, 2019 11:26 am

Sommerfeldt wrote: ↑
Tue Jan 29, 2019 11:24 am
I think I did - if you stick the pump inlet in a jar of fuel and turn it on, it'll spray out 120 liters of that fuel in an hour. So bring a big jar.

- S
Read again...i asked you about pressure.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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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