4.6 TC?? (its been a long day at work so forgive me for not knowing)

Well, I just went and got my truck back from the dealer from being fixed. Tomorrow I will go get a new tire for the new wheel and i'll be good as new. Then I can concentrate back on my MPGs instead of not having my truck---LOL.

-------------DirtySCREW

 

Dirtyscrew. TC=Torque converter

Witch i have no idea why having a 4.6 TC behide a 5.4 with a 4.6 tune would get you good mileage??

Also i had a TechII scanner on my truck and went for a ride. 4th gear at 43MPH the engine has a 90% load on it.

its like shifting your stick into 5th gear at 40MPH it lugs the motor.

my speedo is off it says 70 GPS says 78MPH but what ever it is my motor turns 2,100 RPM 4.6L with 3.55 gears and 265/75R16 BFG A/T's

 

So , did you ever figure out what happened ?

 

Yea......someone's been messing with my truck......dealer advised that ALL the lugnuts could be turned by hand!!!!!

It's gonna be a bad day for whoever did/is doing it when I find them!!!

----DirtySCREW

 

Don't blame you there, it is putting your life in danger. Congrats on getting it back together though.

 

Why would someone do that ? You would really have to wizz someone off to the point of insanity, right ? For them to go out of their way to harm you and possibly someone else. You have a good Life Insurance Policy? I know there's some wicked *** woman out there, but mann, yea, they don't just come undone with aluminum's. UNLESS, your using the wrong lug nuts. The shop would have informed you tho.

My daughters front wheel ALMOST fell completely off on her F250 4X4. When I arrived, the wheel was leaning pretty good with one of the eight nuts still holding on lol. But that's a heavier drive train, -it took it and I was able to jack it up and steal a few nuts from the other wheels to get it home.

Same thing, all nuts where loose all the way around. Turned out one of her friends who install new rims and tires for her, didn't torque them down.

 

I don't know. I can't for the life of me see 20 lug nuts becoming loose ON THEIR OWN at the same time!!! I have 2 sets of Ford wheel locks on the way and will soon have 2 wheel locks on every wheel! I'm glad you daughter was ok, as I'm glad I am. I went and bought a torque wrench and will use it to proper specs anytime I mess with wheels again. And here I thought I may have cracked a rim due to tightening TOO MUCH. This is a cruel and messed up world we live in Jbrew! I see it everyday when I go to work----DirtySCREW

 

Just curious as to how your calibration of being in forth gear at 43 mph equates a 90% load on the motor? And how is it similar to shifting up to 5th gear at near identical speed? other than obviously a high gear at a lower speed lugs the motor. As the motor is no longer in its peak "power producing rpm range" However you generally see an increase in mpgs when your at low rpm, high vacuum

Is the 90% load what your scanner told you? or did you use mathematical formulas to determine what load via the gear ratio and tires it takes to move the vehicle at said speed.

I'm not sure if running the 4.6 TC behind a 5.4 helps at all And I'm further not sure, how, if at all a 4.6 tune helps mileage Running the 4.6 TC behind the 5.4 I would assume to decrease mileage. However this theory may not be entirely true as highway rpms are generally higher than those required to lock up a TC. Thus no notable difference between a 5.4 or 4.6 TC.
Running a 4.6 tune on the 5.4 motor will have a tendency to run the motor a little on the lean side of things. However I'm not convinced that any detrimental damage will occur from this. In all honesty there's not a huge difference between a 4.6 and 5.4 as far as displacement is concerned. On a 5.4 each cylinder is 1/10th of liter larger. or 100 milliliters.( a 20z bottle of pop is 591 mL. so roughly the same amount of space occupied by 1/6 of a 20z soda. not in liquid, just the space it occupies) Now the preset conditions for fuel trim that's loaded on the pcm actually have a wide range of acceptable limits. As the MAS registers the amount of volume of air moving through the intake, it sends this information to the pcm, which in turn uses this information in a mathematical formula using information from the O2 sensors to set a fuel trim that the motor wants. Now some argue that the factory preset conditions don't allow for a 4.6 tune to deliver all the fuel necessary at higher rpms and wot. Which may be true to an extent. i.e. computer settings limit the amount of fuel believing it has reached its maximum rich settings.
So what I'm saying is unless your running the truck at high rpms and under heavy throttle conditions you may not notice any difference in power. However this information is all subject to verification from the appropriate sources.

I watch my mpg religiously. Save my gas receipts and compare this my mileage. And as well I'll fill the tank go for a drive, record mileage, then fill the tank back up and it tells me exactly how many mpg I was getting on that trip.

 

ME too!.... I just don't understand how my mods and conservative driving doesn't net me better mileage on the highway!---DirtySCREW

 

Don't feel like the Lone Ranger. I bought my '98 used, and was getting 14/17. NO JOKE! At 100K it dropped off to about 11/13, and haven't been able to get it back up. Complete change of fluids, filters, plugs. I even took the mechanical fan off for about 20K and NOTHING! I know it is missing some, because I can feel it. I am going to buy some new coils from Uneek supply, as I cannot think of any thing else to do. I had not heard about the problems with the E3 plugs, but I am glad I didn't buy any. At any rate, this makes no sense, and drives me nuts! I have a '98 w/5.4/3dr.cab, 4wd, and a cap. It had just 69,800miles on it when I bought it in '06. Even new tires didn't help. I also appreciate
the heads up about throttle body spacers. I currently have 132,000miles on it.

 

I wonder if elevation may be a factor in part of this difference. Also what octane of fuel are you guys running? And have you tried running some seafoam in it?

 

115 replies and over 2000 views.
It's pretty simple once it's understood that power to weight ratio is the prime control of fuel used to move the weight as well as engine displacment.
A 4.6L (263 cu/in) small motor makes max torque (what moves the vehichle) in the 3200 RPM range.
Do you normally drive in that range.
NO.
You normally drive well below this point in the 1500 to 2200 RPM range where the motor is well down on torque and overdrive makes it worse yet for throttle response.
What does that mean?
It means you will apply more throttle angle to get the truck to move and down shifting yet with increased RPM..
What does that mean?
It means that the more throttle you apply the more the motor injects fuel, you lose.
These are your basic mileage problems.
These trucks, over the average of many trucks, are at about a 15 mpg or less level.
You cannot improve it very much unless radiacal design changes are made to the motor.
The average owner is not equipped to do this.
No use to labor over it because you can't do anything about it.

 

Dirty was not trying to come off an ***.. Wish i could tell you why i get decent MPG's But idk.. the only things i have done is red maint.. Meaning Oil plug's tires ect.. and i changed my coolent once with my thermostat.. 124K.. allthough i have noticed a drop.. dont do any highway at the moment.. and its cold im getting 12 City now.. Warm up time stuff like that.. is why i think i droped..

 

Thanks Ford4life!

Bluegrass....where does the 5.4 make max torque at? With my normal driving, the trans changes gears around 2000 RPMs. When I had a Yukon, I could get better mileage than the Mrs. She would get 14.5 in town where I would get 15.5-16. I would go ahead and get thru the gears to get to Overdrive where she used lower RPMs and the trans didn't shift as soon burning more gas. DO YOU THINK THAT I MAY BE DOING WHAT SHE WAS ON THE YUKON???? DO I need increase my RPMs 500-1000? I may try it after this tank.---DirtySCREW

 

That might be a possible factor in the matter. IDK you might try and change the transmission shift points???? That might be all it takes