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Old 02-12-2012, 07:33 PM   #1
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Horrible fuel economy 03 gt

Anyone have a reason why i get 10 mpg?
-2003 manual 4.6l
-136000 miles
Stock everything

When i bought the car
It had an 06 crown vic motor with 70k on it
I get aproximately 9-12 mpg
And i dont "floor it" either
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Old 02-12-2012, 07:50 PM   #2
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Have you checked your spark plugs? Also how's your tire pressure?
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Old 02-12-2012, 10:02 PM   #3
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Quote:
Originally Posted by JDF
Have you checked your spark plugs? Also how's your tire pressure?
Not too sure about tire pressure. I'm getting my car checked soon but when is the last time you heard a stock gt getting 10mpgs lol?
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Old 02-12-2012, 10:23 PM   #4
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I've never heard of that. I get the feeling that somehow the car is running extremely rich. Are you taking it to a dealer?
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Old 02-12-2012, 10:27 PM   #5
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You would be suprised that even a sort of heavy foot can destroy your mpgs. If I were you I would replace spark plugs, wires, and fuel filter. Maybe even put a fuel cleaner in or seafoam it. And obviously tire pressure but that shouldn't make that much of a difference
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Old 02-13-2012, 12:59 AM   #6
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Check air filter and check for vacuum leaks too. You clould have multiple issues.
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Old 02-13-2012, 06:44 AM   #7
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I get 7-11 mpg at the track going full tilt in my mach 1! 10 normal driving is crazy (just got a city only tank to 22mpg!) Id start with a full tune up. Coils, plugs, filters, clean or replace injectors, get your emissions checked too, may yeild your problem. You must be running stupid rich.
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Old 02-13-2012, 07:00 AM   #8
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[QUOTE="JDF"]I've never heard of that. I get the feeling that somehow the car is running extremely rich. Are you taking it to a dealer?[/QUOTE
I'm taking it to my local mechanic

---------- Post added at 08:00 AM ---------- Previous post was at 07:57 AM ----------

Quote:
Originally Posted by DaBluedude
I get 7-11 mpg at the track going full tilt in my mach 1! 10 normal driving is crazy (just got a city only tank to 22mpg!) Id start with a full tune up. Coils, plugs, filters, clean or replace injectors, get your emissions checked too, may yeild your problem. You must be running stupid rich.
I feel stupid asking this but how can you tell if your car is running
rich? The sound?
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Old 02-13-2012, 07:25 AM   #9
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Sounds like you need a good tune up. Your O2 sensors may be reading wrong too. If you still have catalytic converters they may be bad and clogged, if they are it cold be robbing a lot of mpg. But check your tires. I left my back tires at 16psi after a track night, and forgot they were like that and I got 13mpg aired them up and went back to 19mpg. Make sure they are at around 30-32psi.
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Old 02-13-2012, 08:29 AM   #10
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Quote:
Originally Posted by chickengeorge
I feel stupid asking this how can you tell if your car is running rich? The sound?
Well in extreem cases, yes your car will sound like its running rough and black smoke will come out of the tail pipe. In less extreem cases, it just smells like there's is unburned fuel in the exhaust.
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Old 02-13-2012, 08:43 AM   #11
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Re: Horrible fuel economy 03 gt

Quote:
Originally Posted by chickengeorge View Post
Anyone have a reason why i get 10 mpg?
-2003 manual 4.6l
-136000 miles
Stock everything

When i bought the car
It had an 06 crown vic motor with 70k on it
I get aproximately 9-12 mpg
And i dont "floor it" either
I read where your going to take to your Local Mechanic, I'm not saying the Mech. does not know, But I think you should find and take to a Ford Mech, so they can connect to the Computer, to find the exact flaw in your system. I believe what "Austonknoll, jjsg09 and irishn8" said was accurate checks also. But if you have no Dealers around you or Lincoln Dealerships around then replace the stuff, the guys above recommended. There's definately something wrong and it could be any of those things or ALL of those things. 136000 miles, is not a small number.
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Old 02-13-2012, 08:53 AM   #12
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First off do the simple stuff!.. Check your tire pressure, and check your air intake and hoses!.. Make sure there not cracked and that they are nice and snug!.. And if that don't fix it then I'd go for a tune up!.. Replace the airfilter, spark plugs, and fuel filter!.. You don't have plug wires (at least not in the typical sense) so you don't have to worry about them!.. A clogged fuel filter is not a likely cause but it can contribute to your problem!.. And it's a cheap easy fix!.. If all of that don't fix it then go get a diagnostic check run on your car!..
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Old 02-13-2012, 09:12 AM   #13
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Quote:
Originally Posted by Eturner
First off do the simple stuff!.. Check your tire pressure, and check your air intake and hoses!.. Make sure there not cracked and that they are nice and snug!.. And if that don't fix it then I'd go for a tune up!.. Replace the airfilter, spark plugs, and fuel filter!.. You don't have plug wires (at least not in the typical sense) so you don't have to worry about them!.. A clogged fuel filter is not a likely cause but it can contribute to your problem!.. And it's a cheap easy fix!.. If all of that don't fix it then go get a diagnostic check run on your car!..
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Old 02-13-2012, 09:13 AM   #14
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I just remembered this, my buddies 99 GT was getting horrible gas mileage and he took it to Ford and it was his emergency brake stuck and they fixed it and his mileage was normal again.
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Old 02-13-2012, 09:20 AM   #15
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Yup that could do it too, there's a long list of things that could cause poor gas milage and/or lack of power.
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Old 02-13-2012, 02:11 PM   #16
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Quote:
Originally Posted by jjsg09
I just remembered this, my buddies 99 GT was getting horrible gas mileage and he took it to Ford and it was his emergency brake stuck and they fixed it and his mileage was normal again.
Oh wow
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