locovaca
Member
- Joined
- Jan 26, 2008
- Messages
- 707
- Reaction score
- 4
- Points
- 18
- Location
- DeWitt, IA
- Vehicle Year
- 1993
- Make / Model
- Ford
- Engine Size
- 3.0
- Transmission
- Manual
So I'm still trying to figure out my low MPG situation (low 20's with nearly all interstate driving). The last few weeks I went and retrofitted an Explorer Message Center and Taurus Digital Cluster to my Ranger (more on that in another thread). Both of them come with MPG calculations, which are made by using the speed sensor signal (which I have confirmed is 100% spot on) and the fuel flow signal from the computer.
The Taurus Cluster has average and instant MPG, and the Explorer MC has both of those and a feature which shows the amount of fuel consumed. I did a fill up today; the MC said I had used 13.3 gallons of fuel, and I filled up with 14.7. That's a 10% difference. The important thing is that my average MPG according to both was 25.1 MPG, based on that 13.3- that's more of what I am expecting. With the real fuel used, it was 22.7.
From what I've read on FordFuelInjection.org, the Fuel Flow signal is 100% dead on. It is an absolute value of the number of times it opens the fuel injectors * the number of injectors, so there isn't any compensation needed for an I4 vs V6 vs V8. So I'm operating on the assumption that the computer is right and I'm losing fuel somewhere on the line.
I need to get a pressure tester, but checking pressue is on the list. My next thought is maybe someone swapped in an injector or two which was a higher flow than stock. Which comes to my first question- how do you identify the injectors?
The next question is, any other ideas? The regulator seems ok, but I'll get that fully tested when I get my pressure gauge. No leaks that I can see/smell... the truck overall runs fine, it just gets poor mileage.
The Taurus Cluster has average and instant MPG, and the Explorer MC has both of those and a feature which shows the amount of fuel consumed. I did a fill up today; the MC said I had used 13.3 gallons of fuel, and I filled up with 14.7. That's a 10% difference. The important thing is that my average MPG according to both was 25.1 MPG, based on that 13.3- that's more of what I am expecting. With the real fuel used, it was 22.7.
From what I've read on FordFuelInjection.org, the Fuel Flow signal is 100% dead on. It is an absolute value of the number of times it opens the fuel injectors * the number of injectors, so there isn't any compensation needed for an I4 vs V6 vs V8. So I'm operating on the assumption that the computer is right and I'm losing fuel somewhere on the line.
I need to get a pressure tester, but checking pressue is on the list. My next thought is maybe someone swapped in an injector or two which was a higher flow than stock. Which comes to my first question- how do you identify the injectors?
The next question is, any other ideas? The regulator seems ok, but I'll get that fully tested when I get my pressure gauge. No leaks that I can see/smell... the truck overall runs fine, it just gets poor mileage.