Fuel Injection and PCM - JeepForum.com

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post #1 of 8 Old 09-29-2013, 10:29 AM Thread Starter
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Fuel Injection and PCM

Hi everyone

I am in the process of deciding exactly what I want in Jeep Wagoneer. Two things I do not want are fuel injection or a PCM/Computer. It is my understanding that Jeep never put fuel injection in the Wagoneer ( 1963-1991). Is that correct? The other issue is a PCM/Computer. Can someone alot more knowledgeable then me tell me what year Jeep started putting PCMs in their wagoneers? With that information I can narrow down my search for a Jeep. Thanks in advance.

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post #2 of 8 Old 09-29-2013, 05:13 PM
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1990 FSJ Wagoneer 
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No EFI, no computer anything.
Does have electronic ignition with a control module (post 73), but that's it, and if that's a concern, many guys carry a backup module with them.

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post #3 of 8 Old 09-30-2013, 12:11 PM
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Yep, 74 and up will be running an ignition module. Carry a spare if you're worried.

Pre 74 will be points style ignition.


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post #4 of 8 Old 09-30-2013, 04:05 PM
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Yep, all old school with carburator adjustments, manually set timing, etc.
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post #5 of 8 Old 10-10-2013, 01:00 PM
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post #6 of 8 Old 10-11-2013, 08:12 AM
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1990 FSJ Wagoneer 
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Originally Posted by RockRollin View Post
No EFI, no computer anything.
Not entirely true...I believe Cruise Control is run by a computer, at least in the late models. My '90 has a yellow box under the dash for it. But you can always disconnect it if you really want no computer
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post #7 of 8 Old 10-13-2013, 11:29 PM
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Not really a computer, as such, but more a module similar to what's found in the ignition system. Leaves only you to troubleshoot/adjust if the engine isn't running right.
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post #8 of 8 Old 10-21-2013, 11:27 PM
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The 4.2L has a computer for the BBD carb. Turn key to on (not start) and unplug it, then do Nutter Bypass or HEI dist to fix the timing.

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