850 sudden poor gas mileage
#1
850 sudden poor gas mileage
I am a long time Volvo owner, currently own three (an 850 and two S60's). I recently noticed that my 850 qith 120K seems to dropped from about 24 MPG highway to about 15 MPG. I have had the fuel filter, pluds, rotors, wires changed and it seems to run as smooth as it always has. I have also tried premium gas and injector cleaner to no avail. Any ideas?
#6
RE: 850 sudden poor gas mileage
Well, it sounds like you have done most of the tune up items I suggest, but have you changed out the air filter? Also, are you carrying around any extra weight in the trunk? Lastly, check the tire pressure. Even though I don't think low tire pressure could cause a 9MPG drop, I have seen stranger things
#7
RE: 850 sudden poor gas mileage
Some possibilities I can think of at the moment, after a long day:
Engine:
- Retiring PCV system.
- Air induction (Air filter, throttle body, secondary air pump if so equipped).
- Vacuum hose(s) disconnected.
- Faulty thermostat not allowing the engine temp to stay at optimum.
- Blocked exhaust making the engine work harder to counter back-pressure.
- Induction/forced air plumbing leak for the turbocharging if so equipped.
*These may not be present, as your engine seems to be running smooth.
Tranny:
- Check the fluid colour/contamination/level.
- Check that the mode selector is in Economy and not in Sport.
Wheels:
- Check low tyre pressure.
- Check for uneven tread wear/have 4-wheel alignment checked at a reputable shop.
Other:
- A/C beingselected at Defrost, keeping the compressor on at all times.
See attached & wait for more replies.
JPN
[IMG]local://upfiles/6892/AEB3B6728589493FB5E3CC3D8A96A90D.jpg[/IMG]
Engine:
- Retiring PCV system.
- Air induction (Air filter, throttle body, secondary air pump if so equipped).
- Vacuum hose(s) disconnected.
- Faulty thermostat not allowing the engine temp to stay at optimum.
- Blocked exhaust making the engine work harder to counter back-pressure.
- Induction/forced air plumbing leak for the turbocharging if so equipped.
*These may not be present, as your engine seems to be running smooth.
Tranny:
- Check the fluid colour/contamination/level.
- Check that the mode selector is in Economy and not in Sport.
Wheels:
- Check low tyre pressure.
- Check for uneven tread wear/have 4-wheel alignment checked at a reputable shop.
Other:
- A/C beingselected at Defrost, keeping the compressor on at all times.
See attached & wait for more replies.
JPN
[IMG]local://upfiles/6892/AEB3B6728589493FB5E3CC3D8A96A90D.jpg[/IMG]
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