What do I need to make a 258 run? - JeepForum.com

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post #1 of 6 Old 07-10-2010, 09:27 PM Thread Starter
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1988 YJ Wrangler 
Join Date: May 2008
Location: Sturbridge
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What do I need to make a 258 run?

Ok guys. Really basic question here. But if your in my boat its not so basic.

At bare minum what is needed electricaly for a 258 4.2L carburated jeep engine to run?

Will it need a CPS or TPS?? I mean obviously the coil, distributor, solenoid, alternator, batery. Im not talking about that stuff. I mean sensor wise or any other b.s.

Im going to be trying to get one to run so I just want to know in advance. It doesnt need any smog stuff anymore so I'd realy like to get rid of most that junk.

Thanks, Frank.

88' YJ/CJ Turbo Diesel
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post #2 of 6 Old 07-10-2010, 09:38 PM Thread Starter
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I've been doing a little reasearch. I pretty much want to do what this guy wants to do:

Bare minimum wiring for a 258. - JeepsUnlimited.com Forums

Run no computer or anything like that. Just the carburated old school set up.

88' YJ/CJ Turbo Diesel
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post #3 of 6 Old 07-11-2010, 06:36 AM
Happy Joe
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1985 CJ7 
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Bare minimum; power the Ford ignition module correctly and verify that the associated wiring is in good condition.
If it has an electronic carb verify that it is clean, operational and properly adjusted.
Verify that it has good alternator to block, battery, chassis and body grounds.

Beyond minimum;
Forget HEI anything; if you want good ignition add a MSD-6a directly triggered from the stock autolite electronic distributor; add a junkyard Ford E-core ignition coil and good ignition wires and a brass terminaled distributor cap (you can use the high voltage cap, spacer and rotor from a Ford but don't accept anything but brass terminals in the cap). The MSD-6a will help the engine run with the poor mixtures generated by the carburettor and different length intake manifold runners.

Don't ghetto up the ignition do it once and do it right.

If you decide to bypass pollution devices (including the electronic carburettor and computer) be aware that you will be responsible for paying to make them operational again, and possibly subject to a large fine if the next owner decides to push the issue.


...a well prepped, well driven, vehicle should do well in any terrain, including the highway.

Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.

Last edited by Happy Joe; 07-11-2010 at 06:52 AM.
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post #4 of 6 Old 07-15-2010, 12:56 PM
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1986 CJ7 
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If you have a carbed engine you wont have or need a Throttle Position Sensor or a Crank Position Sensor, those would be for a fuel injection engine.
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post #5 of 6 Old 07-15-2010, 01:52 PM
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1985 CJ7 
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Do the "nutter bypass" Research it, and DO IT! I did it to mine, and it worked like a dream. I was able to eliminate all of my smog crap, and miles of wiring. It is very simple to do. If I get a chance I will copy and paste the diagram with instructions. I am sure it is on this forum somewhere though. Check in the CJ technical section.

That factory crap is just that, crap. I dont care how clean it is or if it works now or not. It will go out on you. I fought with my factory electronic carter carb and all the wiring, and it never worked right. Did the nutter bypass, and stuffed a rebuilt motorcraft 2100 on it, and it ran like a dream. Never had a problem again.
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post #6 of 6 Old 07-15-2010, 02:07 PM
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Here you go. I found a really nice thread that goes over the process very well. It even has pictures.

It will eliminate all headaches. If you lived anywhere near me, I would help you do it.
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258 , 4.2 , 4.2 liter , 4.2l , electronics , i6 , wiring

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