junkyard fuel injector swap and result - JeepForum.com

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post #1 of 28 Old 07-27-2011, 09:52 AM Thread Starter
karik
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junkyard fuel injector swap and result

read a few threads about swapping out fel injectors with ones out of a dodge neon, and a few different model fords.

couldn't find one neon with the 2.4, and the ford v8's were all super high mileage. One of the threads mentioned using a ford taurus duractec engine's injectors.

found a taurus with only 100000 km's on the clock, and it was really easy to get at the injectors. 8 bolts hold the upper intake manifold on, and four bolts to get the egr tube off and you have easy access to everything, took 10 minutes. injectors are blue in colour and no, i forgot to get the serial numbers off them. paid a whopping 7 bucks for all 6.

took a little fighing to get them installed,

removed fuel rail and old injectors, and cleaned out bores with a toothbrush and throttle body cleaner.

it was much easier installing the new injectors to the rail first, lubbing the o-rings with trans fluid, and then installing the whole assembly to the head.

avereage mileage according to the trip computer before was 16.8 miles to the gallon with 50 / 50 cty / hwy. 280000 kms on the clock with a fresh tune and oil change and free-flowing exhaust (stock cat, cherry bomb glass pack, and junkyard tailpipe off a v8 GC that has a larger diameter)

no BS the trip computer now reads average of 22.8 in city with a much better seat of the pants feel. haven't run it on the highway yet, we'll see.

real easy swap / upgrade if you have the patience.


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post #2 of 28 Old 07-27-2011, 10:44 AM
Marcos
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If the new injectors flow more than the old ones, the engine computer will adjust the fuel trim to compensate and keep the proper air fuel ratio (based upon feedback from the O2 sensor). Since the computer doesn't know the flow rate has changed, it will assume that the reduced injector on time means it is injecting less fuel into the engine when it sends calculations to the trip computer.
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post #3 of 28 Old 07-27-2011, 10:57 AM
gothchick
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Best way to tell MPG is the old fashioned way... Actual miles driven (divided) by actual gallons burned.

Don't fear the regear.

Finished 4x2 --> 4x4 conversion.
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post #4 of 28 Old 07-27-2011, 11:34 AM
melk
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Dear god I dunno how/why this became known as the "Neon injector upgrade" but that idea needs to die die die DIE!!!

You're not going to find them on a Neon.

You want the 703 from 2.4L 95-97 Chryslers. I've pulled 3 sets from 3 different Dodge Stratus now. Fuel rail is literally sitting right there, 2 bolts and it's off. Must have took me under 3 minutes to pull em off. Ford is 715 off mid 90s 4.6 and 5.0L.

I definitely noticed a difference after I installed them, engine runs smoother and I'm getting about 20-40 miles more per 20gal fill-up.

The injector swap works on any engine 4.0 5.2 5.9
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post #5 of 28 Old 07-27-2011, 01:02 PM
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So they are suppose to be better for every motor? 4.0, 5.2 and 5.9? what kind of gains would this bring?

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post #6 of 28 Old 07-27-2011, 02:11 PM
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Quote:
Originally Posted by Marcos View Post
If the new injectors flow more than the old ones, the engine computer will adjust the fuel trim to compensate and keep the proper air fuel ratio (based upon feedback from the O2 sensor). Since the computer doesn't know the flow rate has changed, it will assume that the reduced injector on time means it is injecting less fuel into the engine when it sends calculations to the trip computer.
Ahhhh, the voice of reason.
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post #7 of 28 Old 07-27-2011, 02:28 PM
melk
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Except they don't flow more fuel... Flow rates are the same.

They just do a much better job of creating a fine mist of fuel vs a thick single stream which results in a more efficient, complete burn of the fuel in the cylinder.
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post #8 of 28 Old 07-27-2011, 03:43 PM
AcidAnton
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703 from 2.4L 95-97 Chryslers
715 from 4.6 & 5.0L 90's Ford
Awesome, ill keep these for my records, Thanks!

Dodge Stratus ? What year? and what size engine?
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post #9 of 28 Old 07-27-2011, 07:07 PM
melk
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Quote:
Originally Posted by AcidAnton
703 from 2.4L 95-97 Chryslers
715 from 4.6 & 5.0L 90's Ford
Awesome, ill keep these for my records, Thanks!

Dodge Stratus ? What year? and what size engine?


Chrysler = Dodge = Jeep = Ram = Plymouth = MOPAR

You want a 2.4L Dodge Stratus 95-97

Or any other Chrysler variant with the 2.4, Plymouth Breeze, Chrysler Sebring, but around here my yard had 0 of those but plenty of Stratus. GL!
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post #10 of 28 Old 07-27-2011, 07:14 PM
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Dodge Stratus 95-97 with the 4.2L.

Dodge=C

Nevermind, Melk is the ninja edit dude!!

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post #11 of 28 Old 07-27-2011, 07:20 PM
gothchick
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This mod is definitely on my list of to-do's. Think I'll go with the Ford 4.6-5.0's though. Just seems to me that the Chrysler 2.4's are too close to being maxxed out, causing a shortened injector lifespan...

Don't fear the regear.

Finished 4x2 --> 4x4 conversion.
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post #12 of 28 Old 07-27-2011, 09:23 PM
funkyZJ
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I love these injectors! Chrysler had a mini van with a 2.4 as well. There are different connectors on different years. I read a thread on cherokee forum explaining it all. So I set out and bought the correct ones and it's nite and day difference!!!!! Definitely improves the crappy idle of the 4.0.
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post #13 of 28 Old 07-27-2011, 10:48 PM
tcanthonyii
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Sweet! I think I'll need to do this to my zj. I might even be able to get them for free! Even if you only gain say 1 or 2 mpg over a year that adds up. Especially since I put over 15k per year on my pickup alone. My bike get another 10k or so. That's a l of. Miles
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post #14 of 28 Old 07-27-2011, 11:39 PM
zander21510
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Quote:
Originally Posted by melk View Post
Dear god I dunno how/why this became known as the "Neon injector upgrade" but that idea needs to die die die DIE!!!

You're not going to find them on a Neon.

You want the 703 from 2.4L 95-97 Chryslers. I've pulled 3 sets from 3 different Dodge Stratus now. Fuel rail is literally sitting right there, 2 bolts and it's off. Must have took me under 3 minutes to pull em off. Ford is 715 off mid 90s 4.6 and 5.0L.

I definitely noticed a difference after I installed them, engine runs smoother and I'm getting about 20-40 miles more per 20gal fill-up.

The injector swap works on any engine 4.0 5.2 5.9
How on earth did that even get started....I love the injector upgrade...its much smoother
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post #15 of 28 Old 07-28-2011, 04:49 AM
melk
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Zander do you have a 4.0? If so get a 99+ intake manifold for it. I just put on mine this past weekend and it's great. Just filled up so we'll see how it does mileage wise this next week.
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