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Old 08-05-2010, 04:36 PM
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Terrible Gas Mileage

Hey guys, im extremely annoyed because my car hasnt gotten better then 16 mpg since i had her. My last tank was 12 I'm completely confused because i read people getting like 25. I just put all new plugs wires air filter and fuel filter in and that hasnt helped at all. Any ideas anyone?
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Old 08-05-2010, 04:55 PM
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Re: Terrible Gas Mileage

1) Not being rude, but are you getting your sums right?
2) When was the last time the car was properly serviced? Poor engine condition will hamper your mileage.
3) What size rims have you got on it, if they're stupidly big then your odometer will not read correctly.
4) How are you driving it? On my last run of going easy I got 34mpg, yet if i thrash it, that can easily go down to high teens low 20's.
5) What is the general 'make up' of your driving? If you're sat in traffic all the time then you'll get lower mpg than if you're actually moving at a constant speed.
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Old 08-05-2010, 04:59 PM
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Re: Terrible Gas Mileage

1. yes i am getting them right, i set my trip meter then divide it by how many gallons i put in the tank. My last tank was 13.9 i did it on the calculator on my phone. Its right.
2. I just put all new plugs, filters, wires in and my engine is perfectly healthy, burns no oil at all and runs great.
3. i have 17inch rims.
4. i drive it relatively easy, ill hit vtec once or twice a day.
5. my general driving habits i guess are pretty calm i throw it in 5th going like 30 i try to drive efficiently.
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Old 08-05-2010, 05:05 PM
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Re: Terrible Gas Mileage

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Originally Posted by dannelson View Post
1. yes i am getting them right, i set my trip meter then divide it by how many gallons i put in the tank. My last tank was 13.9 i did it on the calculator on my phone. Its right.
2. I just put all new plugs, filters, wires in and my engine is perfectly healthy, burns no oil at all and runs great.
3. i have 17inch rims.
4. i drive it relatively easy, ill hit vtec once or twice a day.
5. my general driving habits i guess are pretty calm i throw it in 5th going like 30 i try to drive efficiently.
Then honestly I'm at a loss other than actually suggesting you may have a leak in the fuel tank/lines or something. I can't believe that you're only getting 150+ miles to a tank so appreciate your frustration.
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Old 08-05-2010, 05:31 PM
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Re: Terrible Gas Mileage

me too.. im at a complete loss! Its very frustrating. There must be something making me run very rich which could also explain the bogging that i experience often.
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Old 08-05-2010, 05:33 PM
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Re: Terrible Gas Mileage

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Originally Posted by dannelson View Post
me too.. im at a complete loss! Its very frustrating. There must be something making me run very rich which could also explain the bogging that i experience often.
Granted, but you're using that much fuel I can't even imagine it starting let alone running. Sorry I'm not much use, but hopefully one of the bods on here can help.
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Old 08-05-2010, 05:53 PM
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Re: Terrible Gas Mileage

Im not sure but when i brought my civic to get inspected it failed and my neighbor told me to check my fuel rail or fuel regulator for leakage or not spraying fuel properly. Maybe you can check those out.
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Old 08-05-2010, 05:56 PM
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Re: Terrible Gas Mileage

You have 17" wheels, but what size tires? Have you any check engine codes? What's the status of your oxygen sensor? Are there any mods on the car? How about your tire pressure? I know it seems pretty trivial, but it does play a big part in fuel economy.
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Old 08-05-2010, 05:58 PM
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Re: Terrible Gas Mileage

how about a new cap and rotor? not that its gonna make a 10mpg difference... but it could just be part of it. the cap and rotor are IMO the most commonly missed components that require replacement. at least as often as the plugs and wires.

you probably would have mentioned it if you did, but do you ever smell gas, specifically while you're sitting for a while or right when you start up the car? how does the exhaust look when its coming out. if you can see it clear as mud in your rear view when you're in vtec, that could tell you something. how many miles do you have? what octane gas are you using? run a fuel system cleaner or some seafoam perhaps. its usually never one thing that causes these types of problems.
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Old 08-05-2010, 05:59 PM
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Re: Terrible Gas Mileage

Phantom240> okay.. i have codes for egr valve and bad o2 sensor.. my tires are 225/40/17. Mods are skunk2 catback and springs but springs dont matter haha

Beaker> Ill buy a new cap and rotor, it could be just one piece of the problem like you said. Also i do not smell any gas or anything like that on start up. My motor doesn't burn oil or anything my exhaust is clear as day even in vtec. I have 164k miles and i use 93 octane. And my dad suggested running fuel cleaner.
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Old 08-05-2010, 06:02 PM
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Re: Terrible Gas Mileage

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okay.. i have codes for egr valve and bad o2 sensor.. my tires are 225/40/17. Mods are skunk2 catback and springs but springs dont matter haha
Those two codes are a pretty good place to start at. 225/40/17 is a little bit taller than stock. Not by much, but it will have a small effect on how mnay miles you travel versus what your odometer reads.
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Old 08-05-2010, 06:06 PM
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Re: Terrible Gas Mileage

The o2 sensor is most likely playing big factor in horrible mileage....I would at least reset codes after car has warmed up if it is heater 02 code and see how much it improves.

On friends car seemed like it almost double distance per tank on highway with this test
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Old 08-05-2010, 06:13 PM
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Re: Terrible Gas Mileage

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Phantom240> okay.. i have codes for egr valve and bad o2 sensor..
this sort of information is pertty important to know. should've informed us of that when you started this thread... or at the very least get those fixed before saying your gas mileage was really low. when o2 sensors fail the ecu goes into safe mode. and it kills your gas mileage. i drove around for a month with a bad o2 sensor and couldn't get better then 20mpg.. so get those fixed first before anything else. don't forget to reset the ECU when you fix those things. i can guarantee you that will get you back into the 20's
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Drew can be a bigger asshole than me, and tell them in 16353 ways that they're a moron for wasting his time, and still not answer them.
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Old 08-05-2010, 06:18 PM
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Re: Terrible Gas Mileage

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Originally Posted by Beaker View Post
this sort of information is pertty important to know... when o2 sensors fail it goes into safe mode. and it kills your gas mileage. i drove around for a month with a bad o2 sensor and couldn't get better then 20mpg.. so get those fixed first before anything else. don't forget to reset the ECU when you fix those things.
okay thanks beaker. But if im in safe mode wont it NOT hit vtec? I can hit vtec anytime even when my check engine lights on. The o2 sensor im looking to replace is the one on my header, correct?
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Old 08-05-2010, 06:22 PM
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Re: Terrible Gas Mileage

when you run the code it should tell you what bank it is. 1 or 2. 2 is after the cat. 1 is before the cat. what safe mode is, when related to gas mileage is a set a/f ratio. it won't prevent vtec engagement.
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Quote:
Originally Posted by Si Speed
Drew can be a bigger asshole than me, and tell them in 16353 ways that they're a moron for wasting his time, and still not answer them.
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I am not helping you any more. you're a prick
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Old 08-05-2010, 06:31 PM
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Re: Terrible Gas Mileage

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Originally Posted by Beaker View Post
when you run the code it should tell you what bank it is. 1 or 2. 2 is after the cat. 1 is before the cat. what safe mode is, when related to gas mileage is a set a/f ratio. it won't prevent vtec engagement.
i think your thinking obd2 because i know i dont have a sensor after the cat i just put my exhaust on.. and my code is number 41 oxygen sensor heater..
http://92lude.com/self_diagnostic_codes.htm
my dad and i just discussed this and he brought up the point that when i did my plugs they werent black like they would be if i was running too rich. Just something to think about.
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Old 08-05-2010, 06:59 PM
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Re: Terrible Gas Mileage

Buy an oxygen sensor from RockAuto Auto Parts and then report back to us.
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Old 08-05-2010, 07:08 PM
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Re: Terrible Gas Mileage

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Buy an oxygen sensor from RockAuto Auto Parts and then report back to us.
yessir! thanks everybody for the help, i think we hit it on the head! And to reset the ecu i just unplug the battery and that will reset it correct?
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Old 08-05-2010, 08:18 PM
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Re: Terrible Gas Mileage

You could do that, but you will lose radio presets. If I remember correctly, you can pull the clock fuse under the hood, and it will reset the ECU.

Someone correct me if I'm wrong.
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Old 08-05-2010, 08:24 PM
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Re: Terrible Gas Mileage

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i think your thinking obd2 because i know i dont have a sensor after the cat i just put my exhaust on.. and my code is number 41 oxygen sensor heater..
Error Code Chart for Honda Prelude
my dad and i just discussed this and he brought up the point that when i did my plugs they werent black like they would be if i was running too rich. Just something to think about.
ah, you're right. sorry, my brain automatically default to 5th gen knowledge when i forget what gen we're discussing. i forget sometimes about the little differences like that.
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Quote:
Originally Posted by Si Speed
Drew can be a bigger asshole than me, and tell them in 16353 ways that they're a moron for wasting his time, and still not answer them.
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I am not helping you any more. you're a prick
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Old 08-05-2010, 11:38 PM
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Re: Terrible Gas Mileage

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ah, you're right. sorry, my brain automatically default to 5th gen knowledge when i forget what gen we're discussing. i forget sometimes about the little differences like that.
no worries and my car had trouble startin tonight. It would start then stall. Did it like 3 times. Think that could be related to this bad o2 sensor making the engine flood at start up or something? I got it to start buy holding my gas a little and then holding the idle at 2k for a minute.. then it ran fine no stalling. Hmmm
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Old 08-05-2010, 11:59 PM
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Re: Terrible Gas Mileage

Go get your car e-tested if you fail they should tell you whats wrong with your car.
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Old 08-06-2010, 01:08 AM
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Re: Terrible Gas Mileage

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Go get your car e-tested if you fail they should tell you whats wrong with your car.
i passed emissions a few months ago...with the check engine light on for o2
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Old 08-06-2010, 04:12 AM
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Re: Terrible Gas Mileage

dood i dont know if 5th and 4th gens are much different but i read we 5th gens get 19 city and 21 hwy. so yeah i feel u but we arent exactly fits u know. and fit or not a car that old probably gets nowhere near original mpg
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Old 08-06-2010, 02:52 PM
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Re: Terrible Gas Mileage

Hey my 2 cents,

After I bought my 97 lude I was getting 18-20 mpg city & highway.

Somethings I did oil change, then seafoamed my engine, did another oil change cause of the seafoam switched to 10w since I moved to texas and made sure the tire pressures were correct.

I drove down to Texas thurs night got here in the morning but I was getting 30mpg highway. I cruised half the time down at around 70-85.
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