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BAD MPG

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
jimmy57
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jimmy57

Re: BAD MPG

Post by jimmy57 » Wed Jul 03, 2019 12:48 pm

You should count 4 or 5 gear changes, 1-2, 2-3, 3-4, 4 tq conv lock or 3 tq conv lock as 5th change. If Tq converter is locked and you depress brake pedal with left foot while keeping right foot applying throttle and you see tach go up 300 to 500 rpm then you know TC is locking.
Another check is to go to flat level parking lot or other paved area and with it stopped in N go to R or D and let it roll and then go back to N. It should roll a few feet once it is placed back in N if there is no drag in driveline.



5ft24
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Year and Model: 2004 XC90 T6 AWD
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5ft24

Re: BAD MPG

Post by 5ft24 » Wed Jul 03, 2019 3:21 pm

jimmy57 wrote:
Wed Jul 03, 2019 12:48 pm
You should count 4 or 5 gear changes, 1-2, 2-3, 3-4, 4 tq conv lock or 3 tq conv lock as 5th change. If Tq converter is locked and you depress brake pedal with left foot while keeping right foot applying throttle and you see tach go up 300 to 500 rpm then you know TC is locking.
Another check is to go to flat level parking lot or other paved area and with it stopped in N go to R or D and let it roll and then go back to N. It should roll a few feet once it is placed back in N if there is no drag in driveline.
yep, all good. trans is solid, no issues, tcc engages when it should, and releases when the brake is touched. rolls freely both directions. Did some digging and found the Bosch sensors (not using the Volvo part... that is why the price was so high) and have the set of 3 coming for 307 total



5ft24
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5ft24

Re: BAD MPG

Post by 5ft24 » Wed Jul 03, 2019 6:20 pm

So Amazon is really fast. O2 sensors arrived today. Installed in about an hour. Long-term fuel trims went from +8% to +1%
Looks like these might have been the problem all along.



tardcart
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tardcart

Re: BAD MPG

Post by tardcart » Wed Jul 03, 2019 7:03 pm

nice job!
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5ft24



5ft24
Posts: 107
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5ft24

Re: BAD MPG

Post by 5ft24 » Fri Jul 05, 2019 1:20 pm

Looks like the O2's were the issue.
Ran about 175 miles and used 8.5 gallons A little over 20MPG
and my freeway driving is 75MPH
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June



5ft24
Posts: 107
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5ft24

Re: BAD MPG

Post by 5ft24 » Tue Jul 09, 2019 8:43 am

After 2 more tankfulls, I am getting an average of 20.9MPG on my commute!



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