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98 XC BAD fuel mileage, need help

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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CIK7
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Year and Model: 1998 Volvo V70 XC
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CIK7

98 XC BAD fuel mileage, need help

Post by CIK7 » Fri Dec 13, 2019 10:18 am

The engine in my car is fairly immaculate. Intake ports super clean, intake valves shiny, fairly new timing belt kit. I have put in new spark plugs, PCV sys, air filter, all vacuum lines, coolant tank, coolant (2x), complete fuel sys cleaner in tank. Yet my fuel mileage is 14/20 mpg city/hwy. That's what a late 90's Chevy Suburban gets. I understand my V70 has the AWD shaft, but the estimated mpg is 17/26. I called Robert 'DIY' Spinner (RobertDIY on YouTube). He said I should be getting at least 25 on the highway. He said it could be a dirty or broken MAF sensor. There was hair, fabric, and dirt on it. I got it really clean. What else could be affecting my fuel mileage?
1998 V70 XC black ($1K trade, Mi:144/147K, immaculate, remodel in progress, 2 updates coming soon)
1998 V70 XC white ($50 cash, junk, donor for my black XC, off to jy soon, PM for parts)
2001 V70 Ba white (sold)
2009 Impala LT 3.5L (sold)

Plans for my 98 XC: 16T/18T, P2 M66 swap, logo/badge delete excl grille

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abscate
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Re: 98 XC BAD fuel mileage, need help

Post by abscate » Fri Dec 13, 2019 10:49 am

Its time for a compression test. If the engine is worn, or valves are leaking, efficiency suffers

Brakes can drag
Get a scanner and read your fuel trims, injection times, assess that stuff
How many miles are on the puppy?
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CIK7
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Year and Model: 1998 Volvo V70 XC
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CIK7

Re: 98 XC BAD fuel mileage, need help

Post by CIK7 » Fri Dec 13, 2019 2:20 pm

abscate wrote:
Fri Dec 13, 2019 10:49 am
Its time for a compression test. If the engine is worn, or valves are leaking, efficiency suffers

Brakes can drag
Get a scanner and read your fuel trims, injection times, assess that stuff
How many miles are on the puppy?
About 145,5xx miles.
1998 V70 XC black ($1K trade, Mi:144/147K, immaculate, remodel in progress, 2 updates coming soon)
1998 V70 XC white ($50 cash, junk, donor for my black XC, off to jy soon, PM for parts)
2001 V70 Ba white (sold)
2009 Impala LT 3.5L (sold)

Plans for my 98 XC: 16T/18T, P2 M66 swap, logo/badge delete excl grille

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June
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Re: 98 XC BAD fuel mileage, need help

Post by June » Fri Dec 13, 2019 3:17 pm

Your car is not rated 17/26 mpg that is for a front wheel drive 2.4L equipped car. Here are some screenshots of the EPA gas mileage for the 2.4 FWD which is not your car and the 2.3 and 2.4 AWD of which one is your car. I owned a new 98 V70 XC 2.3L and it was no gas miser. That was never the point of the car. Also notice Premium fuel is stipulated as used by the EPA during testing. If you use regular and run heavy oil that alone will make the couple mpg difference from what you are getting and what the actual original mpg rating is. June
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CIK7
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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