oiy, talk about bad gas mileage! - Mustang Evolution

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Old 10-29-2003, 02:24 PM   #1
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oiy, talk about bad gas mileage!

Damn, I just got 16.7 mpg on my last trip. (mostly interstate!) It was raining the whole way, that wouldn't make a difference would it?

It is basically stock. (CAI + Dual exhaust)

Anyway, I'm wondering what sort of things could be messed up to give me such poor mileage.
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Old 10-29-2003, 02:26 PM   #2
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ahhh... welcome to the world of crappy milage

i get about 20 on the highway with all my mods (including 4.10's) and about 16 in the city


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Old 10-29-2003, 02:30 PM   #3
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You guys are getting ****ty ****ty mileage.

I get like 25 highway on long trips, sometimes 27....

Whipster how many miles on your car?

Id say its time for a tune up.

Spark plugs, wires, fuel system treat ment, some fuel injection cleaner, Clean out your throttle body, clean your maf.

Maybe you need a tune. Some sensor could also be out and you might not know it.
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Old 10-29-2003, 02:30 PM   #4
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Yeah, but I have standard gears and basically a stock motor
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Old 10-29-2003, 02:32 PM   #5
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I've got 79,*** on it.

Replaced the spark plugs a month ago, just cleaned out the TB

Think I'll have to get some fuel treatment/injector cleaner and see how that works
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Old 10-29-2003, 02:35 PM   #6
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Maybe when you got ur exhaust installed they screwed one of your o2 sensors.

That would cause horrible mileage.
Id take it somewhere get them checked out.
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Old 10-29-2003, 02:39 PM   #7
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how difficult are those to install?
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Old 10-29-2003, 02:40 PM   #8
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front ones are a pain, rear ones arent too bad.
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Old 10-30-2003, 07:47 PM   #9
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hey charles, I just had my Computer checked and it came up as "P0174" 02 bank 2 lean. I got a thing of lucas Injector cleaner, I am going to try this. anyone think it will help (o BTW my light has not come back on yet.)
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Old 10-30-2003, 08:27 PM   #10
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injection cleaner wont help at all in that case.

you have a passenger side 2nd oxygen sensor out.
Injection cleaner will help your fuel system and injectors.
But your o2's in your exhaust (one being out) will cause you to have a bad idle (maybe) and some bad mileage.
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Old 10-30-2003, 08:31 PM   #11
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Might want to replace your fuel filters.
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Old 10-30-2003, 08:33 PM   #12
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how can it be out? thats not the code for it being out.
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Old 10-30-2003, 08:34 PM   #13
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I have seen O2s go bad and the vehicle run super rich too, blow black smoke out the exhaust. An 86 V6 Ranger we had did that.
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Old 10-30-2003, 08:36 PM   #14
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it runs fine, the only thing was that the check engine light was on
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Old 10-30-2003, 08:42 PM   #15
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Bad sensor can make the car go either way, too lean, or too rich....
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Old 10-30-2003, 08:43 PM   #16
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Also bad O2 can read too lean or too rich and be fine...or the car can be either way and it won't be able to detect it.
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Old 10-30-2003, 08:44 PM   #17
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If your car is getting bad mileage, more likely it may be running a bit rich....
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Old 10-30-2003, 08:46 PM   #18
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mmm 22mpg city/ high way (wll to greenfield and back like a 15-30min drives)
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Old 10-30-2003, 10:08 PM   #19
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Quote:
Originally Posted by Fishers Stang
hey charles, I just had my Computer checked and it came up as "P0174" 02 bank 2 lean. I got a thing of lucas Injector cleaner, I am going to try this. anyone think it will help (o BTW my light has not come back on yet.)

Dude i had that code forever in my car.... hit me on AIM so i can explain what i had to do to get it off. I spent about 800 bucks tryin to figure out wtf was going on, hopefullly i can save you time and money.
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Old 10-30-2003, 10:22 PM   #20
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you might also want to try cleaning ur maf.
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Old 10-30-2003, 11:37 PM   #21
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Hey thanks to ZIM, I am going to check everything out. (cc charles and rick0636, thanks also)
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Old 10-31-2003, 06:18 AM   #22
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Rick is right a car will appear to run better in a lean condition until the upper rpms where the lean condition do the most damage when building up heat in the higher RPM with detonation. really rich will cause the car to run crappy at Idle to about 1500 2000 rpm and then the car starts to run better!!! Actually for the health of the engine rich is better than real lean.
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Old 10-31-2003, 10:12 AM   #23
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My car was running lean, and my idle was horrible.
Bad mileage too.

Hopefully this new pump will fix it.
I still need to replace my 02sensors.
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Old 12-07-2003, 12:40 AM   #24
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When a before the cat O2 sensor fails the computer goes into "limp" mode. Which means it'll run richer than it should, which gives you crappy mileage.

My stock 96 has over 80k miles on it and I get 26+ mpg highway.

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Old 01-06-2004, 02:46 PM   #25
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When a before the cat O2 sensor fails the computer goes into "limp" mode. Which means it'll run richer than it should, which gives you crappy mileage.

My stock 96 has over 80k miles on it and I get 26+ mpg highway.

Steve
mmm ok I hope someone can help me here..

Im running w/o cats so my computer gave me the codes of my 2 before cats 02 sensors were (and still) failing.. but my idle is smooth, there is no smoke in any of my two exhaust tips and my mpg 100% city is 17 and 100% highway is 28-30. After told you this here are my questions:

1. do I need to get some mil eliminators or just leave the car like that ?
2. How can I know is my 02 sensors are really bad (failing) cuz as fas as I know my computer had that reading because Im running with no cats..
3. some people told me that If my computer have a bad reading of my 02 sensors EVEN if they arent failing my car should have having poor MPG, a bad idle or rough start.. but nothing of that in my case

any Ideas?
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Old 01-06-2004, 09:09 PM   #26
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Mines around 300 to the tank. I have reason why I have a stock engine.
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