3.0 Fuel Injectors - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 07-05-2016
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3.0 Fuel Injectors

Does anyone know what the correct fuel injector lbs/hour is for a stock 94 ranger 3.0 v6? Or where i can find that information? The orange plastic caps are cracked on some of the injectors. The truck seemed to be running fine before i took them out, but i was advised to replace them. Should i replace them? In total, factory injectors are over 500 bucks. So i wanted to buy some aftermarket if i can find the pressure.
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Old 07-05-2016
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Stock injectors for a 1994 3.0l would be 14lbs
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Old 07-05-2016
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Quote:
Originally Posted by RonD View Post
Stock injectors for a 1994 3.0l would be 14lbs
Thank RonD! So another question for you, i saw another post talking about color coding on the injectors..to tell the poundage? I looked that up and found a page that said the orange meant it was 19lbs. But I'm gonna take your advice on 14. Any idea what the color code is about?
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Old 07-05-2016
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Color code was probably a good idea but...................every manufacturer has to come on board, and even Bosch who makes Fords injectors didn't always follow color code, lol.

Here is the best list I found, but from 2009: Ford Bosch Stock Injector Colors & Sizes
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Old 07-05-2016
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Yeah you're right, doesn't help much if no body can stick to it lol. So mine are orange, the list you gave says that orange is 19..do you still think i should go with 14's though?
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Old 07-05-2016
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Also, does changing the poundage mean i would have to change any other components? like the fuel pump, rails, or regulator?
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Old 07-05-2016
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19lbs should be fine to use.

Injectors are not like Jets in a carb, larger ones in a stock engine don't give any more power, just a lower "duty cycle"(open time), but there is a limit.

The computer for the vehicle is programmed for the fuel pressure and injector size for that vehicle.
Computer knows if it opens a 14lbs injector for 1 millisecond with 35psi fuel pressure it will get XX amount of fuel.
But the computer is also programmed to "learn" and remember changes in the system.

Computer can adjust fuel trims on the fly, opening or closing fuel injectors for longer or shorter times, based on O2 sensor feedback, lean or rich exhaust.

The reason for this learning and remembering is that over time injectors get dirty and fuel pressure may be higher or lower, this changes the fuel flow expected by the computer, so it is adaptive over time.

But............it does have preset limits, if you were to put in 30lbs injectors the open time would be low enough for computer to think something is wrong with the system and it would turn on the CEL(check engine light) and set a code, Rich code, because open time is so low, engine is not running Rich, Lean and Rich codes are strictly about injector open time and computer's preset limits.
I.E. if you have a vacuum leak(bypasses MAF sensor) the computer has to add more fuel than expected, so longer open time for injectors, computer sets Lean code, because injectors need to be open longer than expected, engine is not running Lean, it is all about injectors open time

19lbs shouldn't set any codes, and are probably better for the 3.0l Vulcan engine anyway.

The math for 6 injectors for 150 horse power and 35psi fuel pressure comes out just at 14lbs per hour

So 19lbs would be better IMO, if you are changing them


EDIT:
No you don't have to change anything else

Last edited by RonD; 07-05-2016 at 12:50 PM.
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Old 07-05-2016
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Oh okay awesome. Super Informative, Thanks again man! I'm gonna search around and weigh my options before i buy. The truck is very old so i'm thinking i'll put minimal money it it for now. I'm hoping to spend more later on some major overhauls.
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Old 07-05-2016
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I found these new injectors by accel. 15 pound, cost not too much more than some manufactured ones i found on rockauto. Can you take a look if they're right? the end caps look a little different than stock. http://www.autopartswarehouse.com/sk...A35150115.html
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Never used them so can't say, they do come up as OK for 1994 Ranger 3.0l
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