horrid gas milage

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Soundwav
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horrid gas milage

Post by Soundwav » Wed Mar 27, 2013 10:30 am

filled up the neon with 94 octane

tire pressure set correctly

no heavy foot!

aftermarket air filter

vibrant dual exhaust

NO other mods.



im getting 300kms a tank if im lucky!

ive used injector cleaner

fresh oil

fresh plugs and wires.



what could be the issue for this terrible gas milage..

would it be wise to replace the o2 sensors

or is there something else i can do to increase the milage

hotrodlarry
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Post by hotrodlarry » Wed Mar 27, 2013 10:57 am

maybe its the gas?

I have close to the same mods and I use 87 octane and get around 250 miles from full to when the gas light comes on. equals to about 33 mpg or so.

Soundwav
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Post by Soundwav » Wed Mar 27, 2013 11:32 am

i wish i could say it was the gas but i dont think it is since it wasnt a corner gas station it was a petro canada station

03_SXT
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Post by 03_SXT » Wed Mar 27, 2013 11:36 am

First and foremost, why are you using 94 octane gas?

You basically have nothing done to your car, so there really is no reason to be running such a high octane.

Use 87 or 89 octane, and see what that does.

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Soundwav
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Post by Soundwav » Wed Mar 27, 2013 11:43 am

only reason i used it was to clean out the motor...

87 octane gas milage was even worse then with 94..

i did notice a huge difference with the idle and the acceleration on 94

car ran fantastic on 94... 87 was a rough ride.... and even worse gas milage
im going to change out the o2 sensor as the car has 214.000kms on it

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Yellow04r/t
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Post by Yellow04r/t » Wed Mar 27, 2013 12:18 pm

I use to get like 250-350 km to a tank when I had te factory r/t tranny now with the 3.55 I get minimum 350km it revs at least a 1000 rpm lower than before at 120km/h in 5th gear on the highway which is nice
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blueneo03
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Post by blueneo03 » Wed Mar 27, 2013 4:40 pm

your o2 sensors are probably clogged up now due to all of the unburnt gas as well as your cat.... the neon is programmed to run on 87 and more than that just gets wasted and dumped into the exhaust... you may need to let things clear out from unburnt gas and try again and maybe check your sessors and for any codes... 94 is wayyyy too much for a basically stock car..
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Soundwav
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Post by Soundwav » Wed Mar 27, 2013 5:37 pm

i did a full tank of 87 got 50km out of the first quater!
ended up getting around 257 kms out of a full tank i thought that was terrible so i decided to run 94 just to see what would happen.. ended up getting just over 300km which i though was still very low for a car like that
since my 1991 ford escort with a 1.9L motor was getting 400+

im going to change out the sensors and see if that will correct the issue!

if not ill replace the cat

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Post by theColonel » Wed Mar 27, 2013 7:17 pm

Soundwav wrote:i did a full tank of 87 got 50km out of the first quater!
ended up getting around 257 kms out of a full tank i thought that was terrible so i decided to run 94 just to see what would happen.. ended up getting just over 300km which i though was still very low for a car like that
since my 1991 ford escort with a 1.9L motor was getting 400+

im going to change out the sensors and see if that will correct the issue!

if not ill replace the cat
:shock: If the oxygen sensors are bad, you should get a "Check Engine Light"
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Soundwav
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Post by Soundwav » Wed Mar 27, 2013 9:41 pm

im not going to worry about this issue at the moment..
power steering switch just went tonight on me.

ill replace that then get back to figuring this issue out

Thanks for reading

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2005.Neon.SXT
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Post by 2005.Neon.SXT » Fri Mar 29, 2013 10:10 pm

What spark plugs you using? I had mine changed a month ago, after I did them last year, and I get about an extra 40 miles.

I have wondered about the O2 sensor... But as the Colonel said... Wouldn't a code be thrown?
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occasional demons
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Post by occasional demons » Sat Mar 30, 2013 12:17 am

The o2 sensor can be off a fair amount, and still do well enough not to set a code. But having said that, the biggest difference I noticed after replacing my 190,000 mile one, was not really any better fuel economy, (I get 350 miles easy to the low fuel light) but a much better throttle response. The quicker switching made a very noticeable seat of the pants gain.

Without a scan tool that can monitor sensors, it is really just a guessing game. You could have any combination of one or multiple sensors off just enough to affect the A/F mixture, and not set a CEL. You may have a small crack in the exhaust manifold, that is letting fresh oxygen into the exhaust stream, so the PCM could be adding fuel to correct the "lean condition".

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Post by Skitlz » Sat Mar 30, 2013 1:05 pm

occasional demons wrote:The fun of finding a problem without codes....
Yes, fun is totally the word. ; )
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Post by racer12306 » Thu Apr 04, 2013 10:04 pm

Big question is, what's the actual fuel economy?

As in L/100km or MPG
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Swordfish2Cowboy
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Post by Swordfish2Cowboy » Sat Apr 06, 2013 6:39 pm

lol 94 octane. MORE IS BETTER
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