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04-02-2006, 12:44 PM
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#1
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Registered Member
Join Date: Apr 2006
Posts: 8
Country: United States
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bad gas mileage in civic cx
WHen I first bought my civic cx about 2 years ago, I bought it in portland and drove it home to montana and got about 45mpg, now I am currently only getting about 30mpg all highway driving and worse city driving. I do have slightly larger tires on than stock and they are 195/55/15. I have also lowered my car slightly. Anyways I was wondering if you guys could give me any info on things to check, ect. and help me find out why I'm getting such bad gas milage.
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04-02-2006, 12:48 PM
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#2
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*shrug*
Join Date: Sep 2005
Posts: 6,195
Country: United States
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Well, check your spark
Well, check your spark plugs, wires, dizzy cap and rotor, all that basic tune up crap. Does your car smell like gas out the tailpipe? More sluggish than usual? Leaking lots of oil type things?
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04-02-2006, 01:01 PM
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#3
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Registered Member
Join Date: Oct 2005
Posts: 1,978
Country: United States
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Year and Sensors
Also, did you buy it new (what year is it), is it automatic, and how long has it been since the fuel system was cleaned? Also, any check engine lights, bad 0xygen Sensors, etc. Tell us everything that's changed since you got it. I doubt the tires would pull the mileage down that much, tho
Also, welcome to Gassavers!
RH77
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04-02-2006, 01:17 PM
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#4
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Registered Member
Join Date: Apr 2006
Posts: 8
Country: United States
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sorry for leaving out some
sorry for leaving out some info.
Its a manuel 92 civic cx. Bought it with 80,000 miles on it, now it has 113,000. I've changed the spark plugs, axles, transmission fluid, dizzy, cap, rotor, oil every 3,000 miles and timming belt, I've put on new 15" rims, they are actually lighter than the stocks steelies though, and new tires for the rims.
no check engine lights, or gassy smells, doesn't burn any oil, it might be a little more sluggish than when I first bought it.
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04-02-2006, 01:19 PM
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#5
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Registered Member
Join Date: Apr 2006
Posts: 8
Country: United States
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oh also, here in montana we
oh also, here in montana we have a lower octane for regular gas, (I think its 83) should I go with the medium grade that is 87 octane.
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04-02-2006, 01:21 PM
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#6
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*shrug*
Join Date: Sep 2005
Posts: 6,195
Country: United States
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No check engine lights
No check engine lights though?
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04-02-2006, 01:22 PM
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#7
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Registered Member
Join Date: Apr 2006
Posts: 8
Country: United States
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nope no check engine lights.
nope no check engine lights.
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04-02-2006, 01:24 PM
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#8
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*shrug*
Join Date: Sep 2005
Posts: 6,195
Country: United States
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My next guess would be o2
My next guess would be o2 sensor or cat.
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04-02-2006, 01:31 PM
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#9
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Registered Member
Join Date: Apr 2006
Posts: 8
Country: United States
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How would I go about
How would I go about checking those things, I'm a college student and have hardly any money so I can't really afford to just replace them if they arn't out.
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04-02-2006, 01:33 PM
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#10
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*shrug*
Join Date: Sep 2005
Posts: 6,195
Country: United States
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I understand the money
I understand the money predicament, of course. Run a wire from the 1 wire on the o2 sensor and hook it up to a DMM, when you're driving it should read about .5 volts, if not the sensor is messed up most likely or the engine is pooped. I have a spare o2 sensor to send you if you need it. Cat you can just take off and look inside of and see if it looks clogged up.
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