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i have an 84 CJ7, i just put a new motor in it but am having problems getting it to run right. i don't want to waste $ on the stock carter carb, i would rather find the least expensive way to put fuel injection on it. i have gotten prices from $1000 to $2395, this is too much for a cheap ass like me. holley offers a pro-jection setup for $719 but they list it only up to 82 models with manual tranny, i have an automatic. another concern is not only running right but i have to get it smogged every year. can someone help me figure this out????? thanks
<IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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Get the head and injection from a 92+ 4.0L High Output, like a Cherokee or wrangler. Swap it on. You get EFI and more HP at the same time, baby!

-xBabyJesus
 

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SAAAAWEEETTTTT!!!!

Just the answer i was looking for too! My POS carb has flat spots all over it, and i just can't get a quality rebuilt one. The head and intake setup is a GREAT idea. Thanks.!!!!!
 

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dont even waste your time with the 258 get a 350 or a 4.3 or a actual 4.0 <IMG SRC="smilies/scary.gif" border="0">
 

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If you do the above idea, which I am thinking of doing to mine, you're going to have to drill and tap some holes in your block. This is hard to do straight unless you bring the block to a machine shop, which means the motor has to come back out. Unless someone knows something that I don't. You also have to clog up some of the water pathways in the bottom of the 4.0 head. The best way of doing it is by welding it and having a machine shop resurface it. I've heard of people doing it with JB weld, though. (I've also heard of the JB weld coming off, clogging water passages, and destroyging engines.)

Oh, and where can you find the head, intake, wiring, and everything from a 92+ Jeep HO for a reasonable price? I know my local yard, which is the only one that has a Jeep that new, wants almost as much as the MPI kits cost!

And if you do do it, you need a crank position sensor. This can either come in the form of a flywheel sensor, like a stock 4.0 uses, or a harmonic balancer sensor. But since the flywheel from a 4.2 doesn't have the gear on it for the sensor like a 4.0 flywheel does, and a 4.0 flywheel won't fit a 4.2, you need the harmonic balancer sensor. One call to Howell will tell you that to get that, you need a new harmonic balancer with the sensor, which they will be happy to sell you for $350, so that adds onto the cost. I don't know if there is a stock application that the balancer and sensor come from.

I'm not saying it's impossible. Just trying to find answers to some of my questions, since this is what I would like to do with my 258.

J. J.

[ 10-08-2001: Message edited by: patooyee ]
 

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14. Which Engine will I have to change the head bolts and have to tap out the block?

Generally 1971-1980 and 1988-90 258/4.2L Engines have 1/2 inch Head Bolts. No changes required.
1981 through 1987 engines have 7/16" Head Bolts. Do not reuse your old head bolts.
I would recommend new head bolts and have a machinist tap the block to ½ inch.
Clifford Performance does sell a kit with spacers which will center 7/16" bolts in the 1/2" holes in the head if you do not want to tap your block.

[ 10-08-2001: Message edited by: xBabyJesus ]
 

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And to think you could just sell tha 6 cylinder and buy a 454 V-8 fuel injected already for about what you would make off the motor and an additional $300.00-$400.00.
Hmm, fuel injection, serious V-8 power, (stock) and a new attitude on life in general. Guess I know what I would do....
 

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Originally posted by yldkat:
<STRONG>And to think you could just sell tha 6 cylinder and buy a 454 V-8 fuel injected already for about what you would make off the motor and an additional $300.00-$400.00.
Hmm, fuel injection, serious V-8 power, (stock) and a new attitude on life in general. Guess I know what I would do....</STRONG>
Are you kidding? If you shop around, you can pick up a 91+ HO head + EFI for like $400-800 I don't think you can get a long-block 454 for that... plus the cost of tranny swap, adapters etc for a whole different engine...

Lay off the crack pipe man.

-J
 

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Yeah, your probably right.... I smoke way too much crack <IMG SRC="smilies/smokin.gif" border="0">
He probably doesn't have the time for his Jeep to be down that long anyway...
<IMG SRC="smilies/thefinger.gif" border="0"> Have a nice day <IMG SRC="smilies/thefinger.gif" border="0">
 

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If you do the above idea, which I am thinking of doing to mine, you're going to have to drill and tap some holes in your block. This is hard to do straight unless you bring the block to a machine shop, which means the motor has to come back out. Unless someone knows something that I don't.
Very true!

I had a 258 with Holley Projection, but it was a pain trying to adjust the fuel curve. The fuel injection was great, could run upside down <IMG SRC="smilies/biggrin.gif" border="0"> , but bring a spare carb with ya on the trail in case it ever craps out on ya.

HTH <IMG SRC="smilies/biggrin.gif" border="0">
 

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Doesn't Howell still make the TBI for the 258? If they do it is around $950. It is not MPI, but it is FI. Your other head option is to find a '87-90 XJ non HO head. You will not have to block any water passages. By the time you are done wiring and making the sensors work you are better off buying the Mopar kit or installing a complete 4.0l. I know because that is what I did.
 

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Whatever you do... DO NOT go with the Mopar MPI kit. It's a hugely expensive PITA that's a bitch to make work right.

This topic has been beat to death. My answer will stay the same. Go V8. I TBI350'd mine and love every cubic inch of it. By far the best swap I ever made (and that's alot!). Don't waist money on that 4.2. Don't fuel inject a motor that was not designed for it. If you have to stick with a 6 banger, just dump a wrecked complete 4.0 HO in it. Sell your junk and call it a day.
 

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Yes this topic has been beaten to death.

If you are looking for a cheap alternative to make your motor at least run dependably, do the Motorcraft 2100 swap.(DO a search on any board, or site)
It's cheap, and reliable, I have no problems with it, and my carter, even after rebuild sucked.

If I can make it work, anyone can!
Yes Yes I know it's not FI, or a Small block Chevy, but it might as well be compared to the Carter!!

Besides, if you had to come on here, and ask..you probably don't want to go down the road you are referring to. No offense but it sounds like you'd have to have someone do the swap for ya which would be pricey. <IMG SRC="smilies/wink.gif" border="0">

ALso are you running the Duraspank ignition?
If so get rid of all that computer controlled crap at the same time.
DO a carb swap, and put in a HEI, or a Team rush type upgrade.
Although HEI is reputed to have problems by the guys that sell the TEam Rush Kits (strange huh)M I have not had any problems with mine.
The 258 breathes poorly, I found that mine with the stock carb and ignition fouled the "center" plugs first, and the outer ones stayed clean.
This is not as much of a problem with the HEI because I guess I'm getting a longer duration spark, and more spark energy, and I'm running more of a gap.

Runs great now...but it's still not FI. <IMG SRC="smilies/frown.gif" border="0">

Personally I'd rather do a motor/tranny swap than put a MPFI on this 258. I liek the motor, but I'm afraid it just wouldn't compare to a nice V8.
MJ

[ 10-09-2001: Message edited by: Maine Jeepah ]
 

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I know that this isn't the 4 sale board, but I've got a 4.0 head I just pulled off a block. No fuel injection or anything, just the head.

(It probably needs rebuilt too).

Offers?
 

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I did the 4.0 swap and I gots to say "hell Yeah baby" It was a relatively easy swap and the motor runs awesome. The hardest part of the swap is getting the wiring and fuel supply to work and even that was easy. the motor mounts and bell housing bolt right up. I know people who have fuel inj. 258's and I blow them away in power, on road and off. Also, it starts, all the time.
 

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Originally posted by Loppy:
<STRONG>Whatever you do... DO NOT go with the Mopar MPI kit. It's a hugely expensive PITA that's a bitch to make work right.</STRONG>
Lesseee, I decked the block, milled the head, installed a bigger cam, bored .060 over, competetion valve job, Borla header, installed Mopar EFI, turned key and never looked back. Yep itsa PITA...not.

In retrospect I'd find a complete 4.0 and swap it in.

My advice is free and worth every nickel!!

<IMG SRC="smilies/wink.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">

Almost forgot...I broke it in on Mobil1.
Too slippery my ASS.

[ 10-09-2001: Message edited by: Clydeglide ]
 

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i have had the 258 and the 4.0L and now i have the great big TPI 350!!!! i would not even mess with the stupid little inline 6! they suck compared to a v-8!

go v-8 or go home! <IMG SRC="smilies/eyemouth.gif" border="0">
 
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