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I have a 2004 SES with the flex engine. I only burn gasoline.

I bought this car two months ago, and have fixed issues with the melting intake manifold, oxygen sensors, new cats (all three), new ignition wires and coil, and spark plugs. It runs fine now, with no MIL coming on and the fuel trims are all steady at 0 - 0.5% (long and short term). However, the MPG in this car is abysmal- typically around 16 in town and 20 on the open highway with the cruise control on.

I can't help but think of people I know with hotrods that get significantly better power with careful tuning. Have any of you had any luck with better economy or performance with a tune?

If so, who do you go to for the tune? Is it on an ECM exchange basis, or a laptop & cable / downloaded file setup?

FWIW, I did try the search function but failed to find results. I may have used the wrong tunes, so please don't flame me too bad!
 

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I have a 2004 SES with the flex engine. I only burn gasoline.

I bought this car two months ago, and have fixed issues with the melting intake manifold, oxygen sensors, new cats (all three), new ignition wires and coil, and spark plugs. It runs fine now, with no MIL coming on and the fuel trims are all steady at 0 - 0.5% (long and short term). However, the MPG in this car is abysmal- typically around 16 in town and 20 on the open highway with the cruise control on.

I can't help but think of people I know with hotrods that get significantly better power with careful tuning. Have any of you had any luck with better economy or performance with a tune?

If so, who do you go to for the tune? Is it on an ECM exchange basis, or a laptop & cable / downloaded file setup?

FWIW, I did try the search function but failed to find results. I may have used the wrong tunes, so please don't flame me too bad!
You should not that low of a milage. I would swap out the O2 sensors (precat) and see if that fixes the problem.

Leon
 

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That fuel trim does not point to a tuning problem, assuming that it is the whole story. What RPM is that trim being measured at? The LTFT and the STFT should not be the same, and there are two separate readings, one for each bank. I would find it very unlikely that they would all be the same value. Please post all LTFT% and STFT% values at both idle and 2500 rpm.
 

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Fuel Trim

That fuel trim does not point to a tuning problem, assuming that it is the whole story. What RPM is that trim being measured at? The LTFT and the STFT should not be the same, and there are two separate readings, one for each bank. I would find it very unlikely that they would all be the same value. Please post all LTFT% and STFT% values at both idle and 2500 rpm.
My long term on both Sables are always negative. Both run fine.

However, one possible is OD. Need to be sure it goes into OD and torque conv. locks up.

My daughter had a '90 that did not go into OD or lockup. Worked fine otherwise. Shop changed fluid and filter, it was clean at 100K. They said need to replace trans. She sold it to a college student who was staying in town. Of course it would not get good mpg on the road. Car had really bad paint and was not worth the trans and paint. Good for a college student needing basic transport.

-chart-
 

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My LTFT and STFT readings on both banks went to 0 at idle when I deleted my EGR. :p

Prior to that the values were in the positive range, to which I came to the conclusion that Ford did not include EGR function in their fuel tables.

With the "melting intake manifold", what all did you do, just replaced the manifold? If that is the case, I would look into what caused that issue and you may find a reason for bad MPG.
 

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The city driving is often explained by driving habits.

The cruise control on the highway can't be explained that way unless you are driving over the speed limit. If you're running 80-85mph? Well, 20 mpg sounds about right.

If I was guessing and I am, it could be a slipping torque converter.
 

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Doug Louis from Ford Performance Specialists in Georgia (you can Google them for more info) should be able to take care of a tune for you.
 

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start with the basics, check all your vacuum hoses and connections for vacuum leaks. make sure the injectors are clean and operating properly. make sure the map sensor(bp sensor if a mass air car) is with in range. make sure you have no fuel leaks. make sure the pressure regulator is functioning properly. do a compression test and a cylinder balance test. make sure you have a new air filter in place and that the air intake tract is free of obstruction. check the catalytic converters for proper flow and back pressure. even though you have new O2 sensors, make sure they are operating in the proper range. make sure all your electrical connections are clean and tight, including the grounds.
 

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99 Duratec owner here. I get 15-16mpg in city driving, and 25-27 on interstates. It's pretty bad IMO. I must admit that I am not the smoothest driver in the city. Anything I can do to improve mpg? I don't think this engine had any tuning or repairs done yet. Even spark plugs are factory.
 

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27 on interstate??? That is awesome, nothing that you can do there.
15 in town? Move in an area with less traffic, less stoplights, higher speed limits (than 35mpg), less 4-way stops and maybe... not gunning it at the green light.
I do "step on it" in town also, but I know that that has a price and I am willing to pay it :)
 

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99 Duratec owner here. I get 15-16mpg in city driving, and 25-27 on interstates. It's pretty bad IMO. I must admit that I am not the smoothest driver in the city. Anything I can do to improve mpg? I don't think this engine had any tuning or repairs done yet. Even spark plugs are factory.
Yea that so-so considering I get those numbers in my 3900 lb 4.6L v8 Thunderbird.....And I'm NOT easy on that car! B)
 

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02 Vulcan. around 16 city, up to 32 highway (cruze set at 75). Average of 24 MPG. ****** in my opinion, but it has 184K, what more could I ask for.

One thing I haven't seen mentioned was tire pressure. I keep mine around 35 PSI cold pressure. I agree with checking for possible vacuum leaks. I found over 8 when I checked mine. Almost every fitting and every hose was dry rotted out and cracked. Some monkey with a heavy hand was in there, pushing and bending the lines, I'm sure of it.
 

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No way a 24 mpg combined driving is a real figure for a 184k miles car. Or even something over 30 mpg on highway. That is just poor measuring or plain bragging.

For example: A 2012 Toyota Avalon gets 20/29 mpg. 2012 Ford Taurus gets 18/28 mpg.
Only a 2012 4 cyl car (Hyundai Sonata) gets on highway over 30mpg. And this with direct gasoline injection and variable valve timing...
 

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No way a 24 mpg combined driving is a real figure for a 184k miles car. Or even something over 30 mpg on highway. That is just poor measuring or plain bragging.
Ditto.

This is the first auto-specific message board I've joined, so I'll give benefit of the doubt and assume that the incessantly bullshit MPG reports I see here are commonplace at car boards across the net.
 

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No way a 24 mpg combined driving is a real figure for a 184k miles car. Or even something over 30 mpg on highway. That is just poor measuring or plain bragging.

For example: A 2012 Toyota Avalon gets 20/29 mpg. 2012 Ford Taurus gets 18/28 mpg.
Only a 2012 4 cyl car (Hyundai Sonata) gets on highway over 30mpg. And this with direct gasoline injection and variable valve timing...

Yup, I'm lying. I really care WTF you think also. I am the most anal retentive mechanic I've met. I can assure you that when it comes to the numbers, there repeatable, they have been several times, and are consistant. Did I mention the P/O had the oil changed religously every 5k, and did mostly highway 42 miles each day? Whatever. Just becasue you can't measure correctly, and most likely don't posess and engineering degree, you really shouldn't run your mouth. I'd invite you up for a roadtrip, so you can witness my lies, but most likely I'd push you out of the car going 75.

Riddle me this assmonkey. I had a 2000 Z-28 6sp, LS1 that would routinely get over 30 MPG on the highway. But alas, since I cannot measure, divide, or conduct repeatable experiments, I'm just lying so I can make it seem my rusted piece of **** is better than everyone elses. :wub:
 

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BTW,just an idea of the condition of the engine. After an oil change with mobile one 5w-30, and 5500 miles, the oil is still golden brown clear, and hard to read on the dipstick.
 

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No way a 24 mpg combined driving is a real figure for a 184k miles car. Or even something over 30 mpg on highway. That is just poor measuring or plain bragging.

For example: A 2012 Toyota Avalon gets 20/29 mpg. 2012 Ford Taurus gets 18/28 mpg.
Only a 2012 4 cyl car (Hyundai Sonata) gets on highway over 30mpg. And this with direct gasoline injection and variable valve timing...
Oh yeah, btw, my freinds 06 solara 3.3 v6 gets 34 highway. And hes an engineer also. He has absolutely no Idea how to measure either.
 
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