Anybody interested in discussing some of the ins and outs of Electronic Fuel Injection?

If it's "Greek" to you, speak up! There are a million and one little things hardly ever mentioned in forums.

How about fuel injector "size"? Just an example.

Whaddaya think?

imp

 

What specifically did you wish to know? Are you talking about an older (just EFI) or newer (SEFI, direct injection)? There are many different concepts out there. Maybe even Hanky or Cougar Fan could mention something or two, also.
If you ever want to relearn driveabilty, read up about the new UEGO sensor for the newer direct injection engines. I've only done driveability for about 20 years, and now I have to learn it all over again!

 

Don't forget the CFI and along with the electronic fuel injection is the air intake (Speed Density and MAF systems).

 

Believe me, I'm NOT forgetting about CFI, or EEC I, II, or III. I'm not forgetting about MCU either, as I am one of the very few people around that remembers EEC II with a VV carb that ran better with lower emmisions then EEC IV CFI.
Speed density systems like that are about 30 years old now, and formed the 'springboard' to the more advanced system we use today. I don't think that most people that owned a '84 or '85 Crown Vic or a '87-'89 Escort with CFI want those systems back, as they were underdesigned and suffered greatly. But, they WERE a stop forward from carbs.
And I know this is a fine point, but the MAP sensor pretty much identifies a speed/density system, and the MAF (much, much, much more accurate) is more reflective of the efficiency that the newer systems have. Of course, even THOSE are going away as we move into direct injection and UEGO's, as I mentioned.
Sooner or later, the aftermarket is going to have a learning curve with the (as of today) new systems that don't really work like the old ones.
It's a complicated world out there.

 

And one other similar point. The '04 Freesytle probably runs great. And I'll be willing to bet that the '10 MKZ run great as well; and probably even better as the basic designed of every fuel injection system is to deliever a car that runs good AND gets good emmisions, with the best power that can be obtained due to regulations.
What isn't mentioned is that the MKZ probably gets much more power out of its engine then the Freestyle per unit of reactant (gas) injected.
And now with direct injection, the wheel has turned to getting even MORE out of smaller, cleaner running, more effiecient engines.

 

It's amazing what sticks in a GEAR NUTS head...

Current vehicles:

My 04 Freestar w/4.2 OHV averages 20-27 MPG depending on Speed/Terrain.
My 10 MKZ AWD w/3.5 DOHC averages 21-24 MPG depending on Speed/Terrain.

Now my previous vehicles to mention a few:

08 Sable FWD w/3.5 averaged 28-34 MPG depending on Speed/Terrain.
01 Explorer Sport w/4.0 SOHC and 4.10:1 Gears averaged 20-23 MPG depending on Speed/Terrain.
00 Mustang w/3.8 OHV averaged 23-25 MPG depending on Speed/Terrain.
00 Taurus w/3.0 DOHC averaged 25-29 MPG depending on Speed/Terrain.
97 Explorer Sport w/4.0 SOHC and 4.10:1 Gears averaged 22-25 MPG depending on Speed/Terrain.
94 Sable w/3.8 OHV averaged 23-27 MPG depending on Speed/Terrain.
94 Aerostar Extended van w/3.0 OHV and 3.73 Gears averaged 25-30 MPG depending on Speed/Terrain.
88 Ranger S/C 4X4 w/2.9 OHV, 5-Speed manual and 3.73:1 Gears averaged 25-29 MPG depending on Speed/Terrain.
85 Mid-Sized LTD w/3.8 OHV and 3.27:1 Gears averaged 25-33 MPG depending on Speed/Terrain.
83 Ranger Regular cab 4X2 w/2.0 OHC, 4-Speed manual and 3.08:1 Gears averaged 20-23 MPG depending on Speed/Terrain.
79 Fairmont 2-Dr. w/302 (Gears ???) averaged 23-27 MPG depending on Speed/Terrain.
72 Duster w/198 Slant-6 (Gears ???) averaged 23-27 MPG depending on Speed/Terrain.
70 Fury w/440 6-Pack and 3:23:1 gears averaged 20-26 MPG depending on Speed/Terrain.
69 Chevy C-10 w/292 Straight-6 with 4-speed and 3.73:1 gears and got 12 MPG regardless of Speed/Terrain.
66 Barracuda w/273 Hi-Po and 3:23:1 gears averaged 18-20 MPG depending on Speed/Terrain.
37 Dodge 1-Ton Dump Truck w/Flat-Head 6 and Carter 1-BBL carb. MPG? Probably about 6-8MPG

 

And over all those cars, have you ever noticed that cars seem to have always grown in size to offset any performance gains made through design? Trucks today are as tall as Peterbuilts, practically.

 

Well! Thanks to you-all for posting! My thoughts were along a bit less technical and sophisticated lines: For each of us who has been fortunate enough to become closely acquainted with the historic introduction and use of EFI, there are likely a hundred or more readers who fear EFI: "I'll have a carburetor till I die"!

These were the people I would encourage to jump in here with comment, question, concerns, and so on. Reading the above posts confirms that a lot of concerns could be addressed by knowledgeable guys (or gals!).

Thanks for reading! imp