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Lack of power/high fuel consumption

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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Lack of power/high fuel consumption

Post by Koocat » Sun Jul 14, 2019 7:35 pm

Hi first post my name is Matt. I just bought a 98 s70 after owning one before. This one gets maybe 200 miles to a tank of gas and has no power. If I floor it it takes off slower then it should but if I press the gas pedal down at a slow rate it seems to have more power. I just tuned it up(plugs, cap, rotor, wires) all Volvo parts as well as a high flow air filter and fuel filter with no change in power. The check engine light is on. Anybody have any ideas or experienced the same thing?

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Re: Lack of power/high fuel consumption

Post by ZionXIX » Sun Jul 14, 2019 7:55 pm

Have you checked compression?

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Re: Lack of power/high fuel consumption

Post by vovo850 » Sun Jul 14, 2019 8:15 pm

what are the codes? If the check engine light is on, you should pull codes and it's a starting point.
1995 Volvo 850 GLT N/A automatic wagon

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Re: Lack of power/high fuel consumption

Post by June » Sun Jul 14, 2019 8:22 pm

Turbo or NA? Which engine? How many gallons to refill at 200 miles? All 18 gallons? How many miles per gallon are you getting? Are any codes present? June
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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Re: Lack of power/high fuel consumption

Post by misha » Mon Jul 15, 2019 12:26 am

Check the codes first.
'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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