Slegacy96 Posted March 9, 2004 Share Posted March 9, 2004 My Legacy has always gotten poor gas mileage and it was something that I was willing to deal with because the AWD and 2.5L engine is worth it. But as of a week ago its dropped from 20 MPG to 10 MPG! And at $1.80 for a gallon im gonna go broke. Ive been driving it very gently without quick accelerations and I reinflated the tires. Anyone have any ideas or have expirienced the same problem? Quote Link to comment Share on other sites More sharing options...
rweddy Posted March 9, 2004 Share Posted March 9, 2004 Wow! There has to be something wrong to get this bad. Do you have a check engine light on? Quote Link to comment Share on other sites More sharing options...
calebz Posted March 9, 2004 Share Posted March 9, 2004 Air filter air filter air filter.. when was the last time it had a tune up? Quote Link to comment Share on other sites More sharing options...
myles Posted March 9, 2004 Share Posted March 9, 2004 Originally posted by Slegacy96 My Legacy has always gotten poor gas mileage and it was something that I was willing to deal with because the AWD and 2.5L engine is worth it. But as of a week ago its dropped from 20 MPG to 10 MPG! And at $1.80 for a gallon im gonna go broke. Ive been driving it very gently without quick accelerations and I reinflated the tires. Anyone have any ideas or have expirienced the same problem? What's the condition of the spark plugs? The air filter? The fuel filter? Is the "Check Engine" light illuminated? Quote Link to comment Share on other sites More sharing options...
Slegacy96 Posted March 9, 2004 Author Share Posted March 9, 2004 Actually it was just tuned up in December. And no, the check engine light isnt lit up. Quote Link to comment Share on other sites More sharing options...
myles Posted March 9, 2004 Share Posted March 9, 2004 Originally posted by Slegacy96 Actually it was just tuned up in December. And no, the check engine light isnt lit up. So the plugs were brand new in December. What do they look like now? Are they loaded with carbon? Oil? Quote Link to comment Share on other sites More sharing options...
Slegacy96 Posted March 9, 2004 Author Share Posted March 9, 2004 And, how do I get to them? Quote Link to comment Share on other sites More sharing options...
myles Posted March 9, 2004 Share Posted March 9, 2004 Originally posted by Slegacy96 And, how do I get to them? For the driver's side, remove the battery and the washer reservoir. For the passenger's side, remove the intake duct work. It's not as bad as it looks. When you reinstall the plugs, tighten to 21 Newton-meters. Quote Link to comment Share on other sites More sharing options...
Dinero Posted March 9, 2004 Share Posted March 9, 2004 If a malfunctioning engine was the cause of a paltry TEN mpg, you wouldn't have to check the sparkplugs to find the problem. Your engine would be shacking like an out-of-balance washing machine from one or more misfiring cylinders. You could probably smell raw, unburnt gas from the exhaust pipe. Your catalytic converter would be glowing like lit a charcoal briquet. First do a walk aroung the car, and look for leaks, and possibly a collapsed gas tank. Run another tankful and recheck your results. The engine could be the problem, but it would be pretty far down on my list. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted March 9, 2004 Share Posted March 9, 2004 If this is based on one tankful, I'd suspect someone siphoned some gas out for their 'donorcycle',car or lawnmower. Quote Link to comment Share on other sites More sharing options...
rweddy Posted March 9, 2004 Share Posted March 9, 2004 Originally posted by 1 Lucky Texan If this is based on one tankful, I'd suspect someone siphoned some gas out for their 'donorcycle',car or lawnmower. Or could be very bad gas. My mother-in-law got a tank full that was test out to be something like 42%. It was back on the east coast and one of these no-name places. She drove off and about 2 miles later her car died. Quote Link to comment Share on other sites More sharing options...
mattocs Posted March 9, 2004 Share Posted March 9, 2004 Coolent temp. sensor? When mine went I had terrible gas mileage...it was like gas was being dumped into the engine. My CEL came on for that...is yours on? Quote Link to comment Share on other sites More sharing options...
nathan Posted March 9, 2004 Share Posted March 9, 2004 any possibility the fuel gauge is bad and you aren't using as much gas as you think? Quote Link to comment Share on other sites More sharing options...
mattocs Posted March 10, 2004 Share Posted March 10, 2004 Yeah...when my gauge reads 1/4 tank I have around 1/2 a tank. Its tricky. :-/ Quote Link to comment Share on other sites More sharing options...
Slegacy96 Posted March 10, 2004 Author Share Posted March 10, 2004 My Gas Guage isnt very accurate. Ive calcualted my gas mileage after two tanks of gas. The first one was 10 MPG and then today it moved up to 12 MPG. No CEL light yet, but Ill keep looking. As for bad gas, my mom puts the same gas in her Lexus and it runs fine and always make sure to put in 89 octane. Any possibility this could be related to my transmission slipping? Quote Link to comment Share on other sites More sharing options...
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