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Author Topic: 4.0 injection on a 258?  (Read 2197 times)

Offline Axle

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4.0 injection on a 258?
« on: January 21, 2015, 03:35:40 PM »
this can be done correct? does anyone know what parts to use? asking for a friend with an 88 yj 258 carb'd
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Offline HEYzipupyourfly

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Re: 4.0 injection on a 258?
« Reply #1 on: January 22, 2015, 12:21:04 AM »
I dont think it can unless you were to buy your own fuel management.  Unless theres someone out there flashing the 4.0 ecm.
I'm sure you could technically bolt stuff up and modify some of the harness to work but I would guess your fuel Is not going to be running at its desired efficiency. making the entire swap pointless in the end because you don't gain much more than shorter crank time to start and better fuel delivery for the end cyl. but if your fuel milage is crap than whats the point?

I have not heard of this swap so i may be wrong but thats the first thing i think of.
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Offline Dan86cj7

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Re: 4.0 injection on a 258?
« Reply #2 on: January 22, 2015, 08:22:45 AM »
http://www.jeepforum.com/forum/f8/junkyard-mopar-mpi-writeup-294427/ ive been looking through this one. i think its 92-95 cherokee/wrangler. gets a little cluttered under the hood. and i know you can use 88ish s10 4.3 set up you also need the ecu.. just cant find that write up yet.
86 cj7 --cammed 258,4"lift,33s,D30(posi-trac/4:10s),D20(detroit/4:10s/1piece axles),T5,Twin-sticked D300

Offline rich

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Re: 4.0 injection on a 258?
« Reply #3 on: January 22, 2015, 08:26:32 AM »
I have both the mopar kit and the gm Howell kit on 258's at work and can't reply now
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Offline jps4jeep

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Re: 4.0 injection on a 258?
« Reply #4 on: January 22, 2015, 09:10:18 AM »
I honestly do not know if factory stuff will work but I would think you can.  I also don't think it would be worth it cost wise. 
People are swapping 4.0 heads onto the 4.2 blocks correct?
The intake and exhaust are located on the head, so swapping heads would allow for all that equipment to be swapped as well.  Then you will have to add the computer, O2 sensor, fuel return, bunch of electrical doo dads like check engine light and probably a ton of other things I can't think of.

Can't speak to if it is easier than a stand alone aftermarket kit or not.


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« Last Edit: January 22, 2015, 09:11:05 AM by jps4jeep »
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Offline Axle

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Offline Krome

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Re: 4.0 injection on a 258?
« Reply #6 on: January 22, 2015, 09:21:32 AM »
woudlnt it be cheaper to swap in a running 4.0 with computer etc?

Offline Axle

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Re: 4.0 injection on a 258?
« Reply #7 on: January 22, 2015, 10:28:05 AM »
yes
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Offline Bluerocket

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Re: 4.0 injection on a 258?
« Reply #8 on: January 22, 2015, 11:04:26 AM »
All dends if you have more time than Money or more money than time :)
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Offline HEYzipupyourfly

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Re: 4.0 injection on a 258?
« Reply #9 on: January 22, 2015, 11:05:35 AM »
woudlnt it be cheaper to swap in a running 4.0 with computer etc?
I would have to say no. after you factor in your time and hassle as well as the cost of the entire engine/accessories, I personally would without a doubt spring for that howell system.
you end up with the tried and true throttle body injection which gives you the fuel injection you want with the simple bolt on kit. looks like it uses the same injectors as the early K series TBI engines had. those systems were about as easy as they come.
off road trucks i always picture simple being better in all cases.

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Offline HEYzipupyourfly

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Re: 4.0 injection on a 258?
« Reply #10 on: January 22, 2015, 11:08:22 AM »
do the 4.0L run a wide band O2?
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Offline SPYDER

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Re: 4.0 injection on a 258?
« Reply #11 on: January 22, 2015, 01:50:04 PM »
do the 4.0L run a wide band O2?


depends on the year...older 4.0's don't but the newer ones I believe did
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Offline Krome

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Re: 4.0 injection on a 258?
« Reply #12 on: January 22, 2015, 03:23:03 PM »
I would have to say anyone that owns a jeep has plenty of time, or has at least volunteered for it. lol
« Last Edit: January 22, 2015, 03:25:36 PM by Krome »

Offline Dan86cj7

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Re: 4.0 injection on a 258?
« Reply #13 on: January 22, 2015, 03:45:35 PM »
86 cj7 --cammed 258,4"lift,33s,D30(posi-trac/4:10s),D20(detroit/4:10s/1piece axles),T5,Twin-sticked D300

Offline Axle

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Re: 4.0 injection on a 258?
« Reply #14 on: January 22, 2015, 06:07:12 PM »
all very interesting, thanks! I have had great luck with webers for years, but the new cj has Howell, so, i'm good.
« Last Edit: January 22, 2015, 07:35:15 PM by Axle »
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