Mechanics

CV JOINT/ GAS MILEAGE

1997 Volvo 850

Transmission problem
1997 Volvo 850 4 cyl Front Wheel Drive Automatic 170000 miles

2.3 T5 I have a very bad cv joint on passenger side. I was getting 22 mpg ave. Now down to 12.8. Is this a probable cause?
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Ignite1444
January 17, 2008.




I doubt it. This would be a first ive heard of. Do you notice black soot around your tail pipe? Is your check engine light on? Does it flash? Let us know, we'll get to the bottom of this.
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Tiny
Mastertechtim
Jan 17, 2008.
No. The check engine light never comes on and yes there is black soot covering the inside of the tailpipe. Dry not oily.

Tiny
Ignite1444
Jan 19, 2008.
My educated guess is you have a lazy oxygen sensor. Your o2 sensor is staying on the lean side, so your computer tries to compensate and dumps in more fuel. Have the o2 sensor checked out by your repair shop, we have scanners that can actually watch the voltages live. Hope this helps

Tiny
Mastertechtim
Jan 19, 2008.

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