sudden decrease gas mileage
185

Asked by RKate Jan 16, 2011 at 07:07 PM about the Volvo S70

Question type: Maintenance & Repair

All of a sudden, I went from 20 mpg to 11? Filling up every 2.5 days!  Any ideas

6 Answers
185

RKate answered 13 years ago

PS...this is my 9th volvo...I am not new to the wonderful world of volvos. Each one of my girls have s70's and my husband and I have xc90's! Any advice? Fuel filter??

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30

Jot answered 13 years ago

What is your mileage? Is the temperature guage reading the same? Is there Black soot in the tailpipe? Has the idle speed changed? Is the check engine light on?

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185

RKate answered 13 years ago

Sorry took so long...wanted to have car checked out. 7 codes came up. But milage is 147,000 K. There is black soot out of tailpipe. Rough idling not stalling, but uneven idling. Check engine light is on. Thank you!

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185

RKate answered 13 years ago

ps..no the temp. gauge wasn't reading right and had thermostat replaced too. Thank you so mucha again!

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30

Jot answered 13 years ago

My guess not knowing the codes with soot, low engine temperature is the front O2 sensor. Have the codes checked ( free at Auto Zone)

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