Haya again...

What is the MPG suposed to be for a -97 XLT 4x4?
My +600 HP 4.6 Mustang gets better milage than this thing...??

I just filled up for the second time and calculated ~11 MPG with just about 50/50 highway/city...??

Just to get an idea... or start looking for a leak...??

 

got to remember a car is shaped like a bullet and a truck is shaped like a brick.. a car is lighter and a truck is heavier... cars perform different they arent going to have the same cpu .. as your truck.... i run into the same problem.. between my 95 t-bird and my 99 f150 just live with it... like everyone else

 

Yea, I realize that, and me too "live with it". I chose these two cars, heck I wish they both had even larger engines!!

Anywho; I was currious since I don't know what it is suposed to be, or there-abouts... Wanted to make sure I don't have a bad tune, spark, leak, or similar...

What do you guys get from your 4.6 XLT 4x4 (in 2WD mode)?
What was Ford advertising mid to late 90s? Windowsticker anyone?

Thanks!

 

Don't know about 4x4, but my '98 XLT 4.6L 4x2 specs are:

Specifications - General
Body Style REGULAR CAB PICKUP 2-DR
Engine Type 4.6L V8
Transmission 4-Speed Automatic Overdrive
Driveline RWD
Tank(gallon) 25.00
Fuel Economy(City, miles/gallon) 14 - 16
Fuel Economy(Highway, miles/gallon) 18 - 21

Whether or not I'm getting that now, I don't know. Haven't calculated it yet. Seems about right though. In the past couple of months I've had a tune up, new tires, fuel injector flush, and cleaned the MAF and DPFE sensors. Might help to do yours if you haven't already.

Jay

RE: This thread.

 

Thanks!

Pretty much what I looked up... have realized I'd be lucky to get 15 MPG...

My coolaid was brown so I started with a flush and clean of the radiator and lines.
(And before that I had to redo the wiring to the rear, fix the CC and install emergency lights... busy week!)

Am thinking about a cone filter and tune (have the equipment lying around) for some more power and maybe better fuel economy...

I'll also look into the fuel system and ignition. Will do that while hooked up looking into the tune....

What's the DPFE sensors? :o

 

when i first bought my truck i saw 12.2-12.6 consistantly. after doing a hand full of mods , and maybe slowing down a bit, i see on average now more like 13.5-13.7 and just got 18.5+ on the highway. I still have a lead foot.

You also have to realize that most gas stations are now carrying the winter blend gas, which generally burns faster and hotter. So you loose mpg in the winter.
-Patrick

 

Can one put in a larger MAF housing and a cone filter without tuning these trucks? Don't wanna run lean...

"Winter blend gas" What?? Never heard of that? SOunds like lower octane gas...?? What will high performance cars do, like my Mustang at 14 PSI boost needing 93+ octane not to detonate and maybe grenade...?? That can't be? Thay could not do that...?? And if faster and hotter burning gas would decrease MPG it can't be by much as otherwise low octane would be obsolete... why not pay 10 cents more for higher octane slower/cooler burning gas and get more MPG...?? And often more power (depending tuning...)

 

Hey kj,

If by cone filter you mean K&N, just do a search of the forum and you'll find plenty of arguments for using FoMoCo OEM filters, including no increase in fuel economy due to the computer compensating for the increased air flow. Mine came with K&N, but I discovered that the MAF sensor gets residue build up from the oil in the filter.

DPFE sensor is located on the right side of the throttle body, underneath the engine placard. Instructions for removing and cleaning are on page two of this thread. Actually quite easy, but use care and caution removing the two rubber tubes if they are dry or brittle looking. Mine were in great shape, so I didn't hesitate. You'll need a small wire brush to clean the carbon out of the metal tubes leading into the DPFE, and some carbon cleaner.

Pacemaker posted this link to a useful Adobe Acrobat reader file regarding the DPFE sensor: http://www.tomco-inc.com/Catalog/dpfe%20sensors.pdf

Hope that helps,

Jay

 

Hmm... will look into it. I have quite a few laying around... is the feeling that the computer can add enough fuel without a tune/flash? I think it should, I know the PYM Mustangs could while the new 3V 4.6s computer is VERY sensitive and require a tune...

Will look for my DPFE semnsor as soon as the rain stops... thanks! Oh and what does it do?

 

What is your gearing and tire size? Look on the door jam sticker for the axle code if you dont know.

http://www.drivetrain.com/Fordtrkratio_posidata.html

Adrianspeeder

 

basically the winter blend is better in winter b.c it has a lower freeze point, and burns sooner (on cold start ups for example) You still have same octane rating, just the chemical properties are different.

And if youve never noticed the winter blend difference, then its doing its job well. It is supposed to act just like the summer blend does in the summer etc.
-Patrick

 

ahh haha I get 15mpg city out of my 5.4L foo!

 

Thanks guys... guess I'll be happy to see 15... Oh well I knew iut wasn't gonna be a Kia but I was hoping for a bit better on the highway...

Will clean all systems and throw on a more open filter for now...

Oh, I also use mid grade/octane fuel, 89-91, is low grade, 87, okay?

 

The DPFE (differential pressure feedback) sensor monitors flow between
the EGR Valve and the exhaust pipe. Sometimes, the DPFE gets carboned up and will cause the CEL (check eng light) to come on. And, more than likely, set a P0401, P0402, etc. code(insufficient EGR flow). Most of the time,
when getting this/these code(s), the DPFE sensor is bad.

Mike

 

its okay, i can still beat you (with my smaller motor) no matter the race.
-Patrick