[Traidmarx]

okay so i've had my stang for about 2 months, i know its a 5.0 and a bit of a gas guzzler...but i've spoken to a few other people who own or have owned mustangs and they say it should be no where near that bad, and i've tested my MPG and stuff right now i'm getting around 10-11 mpg. The car is stock with no mods, and i don't really drive it hard much at all. The check engine light does come on and off, i took it to a ford dealership and paid them 95 bucks to pull the codes, it came back clean. i'm not sure if maybe its a leaky injector, or if O2 sensors would cause the gas mileage, to be off by that much. I have noticed recently that sometimes when i start the car first thing in the morning it will sometimes almost die, or stall out completely. So i'm not sure if it could be a leaky injector causing this or anything. You can smell the car is running very rich. Haven't had time to put it on a wide band or anything to check the actual ratio. Any clue what could be causing this? I hope someone can give me some advice or things to check out, because i've looked over my bank statement today, and i've put literally over 1400 in gas in the car in 2 months.

[93hatch]

theyre idiots if they said it came back with no codes after the cars thrown them, they stay in the memory, do this yourself and see what it comes up with, and yeah thats bad mpg

Ford Fuel Injection How To Run a Self-Test

[Traidmarx]

yea needless to say i was pissed when they took the car back for 10 mins hooked it to a scanner, and came back and said nothing was wrong and asked me for $95...then had the nerve to try and sell me gears.

[2002BLGT]

Originally Posted by UL-B-SRY yea needless to say i was pissed when they took the car back for 10 mins hooked it to a scanner, and came back and said nothing was wrong and asked me for $95...then had the nerve to try and sell me gears.

Hey man bring it down Saturday or Sunday to Bedford and I can hook my wideband up and see what the air/fuel is at , give me a call

[Traidmarx]

okay i'll come down you still live in the same house that i came to a few years back when we were working on nezir's cobra ?

[nolife]

Auto Zone, Advance Auto etc. will normally read your codes for free. Lean and rich bank codes are possible so if it is running that rich, those specific codes should have been set and stored. Oddly though, I have a 5.8 Bronco and the O2 sensor was not working because of the wires being broken but the only code it caused was an occasional lean bank #1 or something similar.

Some EEC4 computers have a "cylinder balance test" that might help pinpoint a bad injector but I'm not sure if the version of EEC4 in the 91 Mustang has that option. At least mine didn't or my Actron scanner thinks it doesn't.

EEC-IV Testing - Cylinder Balance Test

[Traidmarx]

well the 95 is OBD-I and those auto parts stores, told me they can only check the codes if its OBD-II

[93mustank]

just buy a test light and do it our self

[Traidmarx]

yea i'm gonna check it out...just curious though if anyone else would know of any reasons other than O2 sensors or leaky injectors or something that would cause it to get that bad of gas mileage as well as run so rich

[2002BLGT]

Originally Posted by UL-B-SRY okay i'll come down you still live in the same house that i came to a few years back when we were working on nezir's cobra ?

Yea and I have a Ford OBD1 code reader , that gives you the actual code number
its an Equus 3145

Digital Ford Code Reader (1981 - 1995) - EQUUS PRODUCTS, INC.

[Traidmarx]

cool, willie what kind of gas mileage did your 5.0 get?? since you're from the same area as me i can give you an example, i drove from roanoke to franklin county and back to roanoke, i filled up before i left roanoke, when i got back home i was on less than an 8th of a tank. Doesn't seem to be right to me what do you think?

[2002BLGT]

Originally Posted by UL-B-SRY cool, willie what kind of gas mileage did your 5.0 get?? since you're from the same area as me i can give you an example, i drove from roanoke to franklin county and back to roanoke, i filled up before i left roanoke, when i got back home i was on less than an 8th of a tank. Doesn't seem to be right to me what do you think?

well if you get the chip I can dial the MAF in so the air/fuel will stay at 14.7 at cruise and with 4.10s I can get about 17mpg if you keep it under 60mph , you got an adjustable fuel pressure regulator on it yet ? even if you dont get the chip this weekend , once I get some air/fuel readings I can get some readings and start making a base file for it for when you get the chip

[nolife]

Originally Posted by UL-B-SRY well the 95 is OBD-I and those auto parts stores, told me they can only check the codes if its OBD-II

I don't know why I assumed you had a 91, my bad. I guess they don't have the older code readers. Sounds like you got a local hook-up either way.

[Traidmarx]

well i doubt i'll be able to get the chip from you this weekend shit, wachovia screwed up my payroll and i'm sure you seen all the problems in the news lately, so needless to say i haven't gotten a paycheck in about a month, so i'm barely getting by until they get me some damn money. But i'm still gonna get a chip from you

[Chuck Strobeck]

Originally Posted by UL-B-SRY okay so i've had my stang for about 2 months, i know its a 5.0 and a bit of a gas guzzler...but i've spoken to a few other people who own or have owned mustangs and they say it should be no where near that bad, and i've tested my MPG and stuff right now i'm getting around 10-11 mpg.

My 5.0 has 500 horsepower, supercharged with no emissions equipment and i still get about 14 mpg city, thats horrible what your getting def. find the problem thats rediculous.

[BORDEN]

might be injectors.

[Traidmarx]

yea sorta what i'm leaning toward don't really smell gas or anything, so i dunno but maybe its just leaking in the motor or sticking or something i dunno

[2002BLGT]

could be a bad FPR sucking fuel in thru the vacuum line

[nolife]

Originally Posted by 2002BLGT could be a bad FPR sucking fuel in thru the vacuum line

I had that problem. Before I figured it out, my cats turned into a glob and I had enough fuel in my oil that it looked and flowed like black coffee and it took a few oil changes to get it all out of there. At least my engine is clean now

[fogged306]

EGR issues can also cause poor mileage. And defintiely the o2 sensor.. especially if the check engine light comes and goes, a lot of times, that indicates an o2 on its way out.