Mine dont get off full until 100 miles



then 175 at 3/4

 

..then you're empty at 300 miles! LOL---DirtySCREW

 

I'm gettin' a little concerned! I have about 150 miles and its almost 1/2 tank! I'm beginning to wonder if that TB spacer actually DID help with mileage. I won't know until the tanks done and maybe one more tank to have some better data. AHhhhhhhhhhhhhhhhh!!! This is frustrating-------------DirtySCREW

 

Geeze what are getting now, maybe 12 mpg ?

 

Well...half of a 26 gallon tank is 13 gallons.....divided into 150 miles yields 11.5 MPGs!! So...... I'm wondering if the TB spacer actually DID something for mileage OR my MAF is not reading properly since I cleaned it with the denatured alcohol.------------DirtySCREW

 

Probably both. Might wanna spit on that MAF and put that spacer back on before things get much worse.

 

Phil

 

Yeah, seems like my mpg has gone down a bit as well. Not sure if it's the tb spacer removal or the nag cleaning. I might pull the maf off and check it out.

 

My '01 SCREW with a 4.6 and 3.55's with all synthetics and a K&N gets me ~16 in stop and go traffic, as high as 19 on the road.. It's all stock including tire size, has ~86K on it and still has the original plugs..

 

Has anyone checked their tps switch setting? If set that at .99 the vehicle has much better response and the mileage increased on all my Fords.

 

I remember reading somewhere on here that the TPS will self correct. Mine was already set so I couldn't say either way.

 

The TPS was never designed to be set to a specific value but a +/- inital production tolerence limit.
This takes away another source of trouble over the long term. Ever notice there is not much trouble with them.
The TPS software table has a floating zero reference table that is re-set everytime the ignition is turned to 'run' position before cranking. After an attempt to change the TPS static position there may seem to be a difference the next time the motor is run but the PCM takes the change away and returns to the same operating (auto zero reference) it had before the TPS shift setting was changed.
In addition, the TPS has a large role in other functions. For example where/when trans shifting occurrs, when OD functions, when down shifting occurrs, how much extra fuel to add when sudden throttle application is detected (rate of movement), when the EGR functions, when the trans converter lockup unlocks and PCM table updates when in decell mode, a time the PCM has the least to keep track of. All this from just the TPS single output signal's position and rate of operation.
Same thing happens to sample the cold starting temperature by a PCM 'look' at the head temp sensor. These inputs set the amount of ignition timing, the IAC opening, the amount of extra fuel injection and how long these stay at their settings before slowly returning to their hot operating table values (idle comes down to normal) plus there is a software timer involved under very cold conditions so the high idle does not hang up long, especially on a slippery surface making the motor drive against braking on a slick surface.
All these togather makes the FI motors a cold start and drive-away without needing a warmup and it's resulting hesitiation.
There is a lot going on in these systems that most have no idea about.
.
The use of a throttle body spacer has no possible affect on performance.
A 1 inch extra intake length could not be detected in seat of the pants performance.
Any possible air movement alteration is so far from any cylinder port that the airflow loses any possible altered movement long before it ever get to the intake valve area let alone into the cylinder. The total tact length of any cylinder is in the 12 to 14 inch or more range such that any air movement alteration at the trottle body is lost long before it arrives at the cylinder.
Spacers were old school attempts to effect better mixing under a carburator where the fuel and air are mixed before the spacer is approched. Some spacer thicknesses are designed to change plenum size, length per the rpm band. One of the best methods for improving fuel mixing was to place a mesh screen over the head's intake ports to keep fuel in finer suspension. This of course helps combustion efficiency in 'those' motors.
You don't have those same conditions in a port injected FI motor that only sprays fuel at the open intake valve timed just before the valve closes. You can't improve much on this.
A lot of things that are tried is wishfull thinking in nature. Every time I clean up my truck I feel better about driving it or I would not spend the time to do it. Does't make any more power, get better fuel mileage or run any faster.

 

Thanks Bluegrass. It is just so frustrating that other trucks with identical setups or even with lift kits & tires get better mileage than I do when I am DRIVING for the most MPGs possible. I just don't understand that the more I try to do the mileage seems to be going in the other direction. I mean I know this thing isn't a 4 cyl Honda thats going to get 30 MPG in the city....but when I can't even get 15MPG on the freakin HIGHWAY...something is wrong to me.

I saw Extreme 4x4 the other week where they had a few episodes where they took the host's 1999 Dodge Ram to see if they could get better mileage. Granted they spent more money than it was worth to get the mileage, but he had stronger axles for wheeling as well as larger wheels and tires. They did something that I'm wondering would help me. He installed a vacuum guage and said that the higher the vacuum pressure stayed, the better mileage that would result. He said keep it as close to 20 PSI as you could. What are your thoughts? (as I don't completely understand the vacuum in an engine)---------DirtySCREW

 

well it seems like im now getting sub 10mpg now. im not gonna test it right now since im replacing my messed up trans, doing a tune and finishing my efan next week, but right now i have half a tank and 100 miles on this one. most is city driving though

 

dang Banshee! I feel for you man. BUT, after all your upgrades you'll be back on here glouting of your 17MPG city mileage! LOL-------------DirtySCREW