Fuel injection from 4.0 on a 4.2 258 I6 - Jeep Wrangler Forum
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Old 04-15-2012, 11:32 PM   #1
Join Date: Apr 2012
Posts: 5
Fuel injection from 4.0 on a 4.2 258 I6

Got a Jeep Wrangler YJ from 94' with the 4.0 I6. Also have a 87 YJ with the 4.2 liter I6 in it. Plans are to use the main engine without the accessories from the 258, and use the intake manifold with the fuel injection off the 4.0 to take the place of the carburator. Anyone have any experience with this or just want to throw out some ideas to me? Anything would help!

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Old 04-16-2012, 09:39 AM   #2
Timberwolf's Avatar
Join Date: Sep 2010
Posts: 877
that basically what mopar does for their fuel injection conversion kit for the 4.2

if you already have the donor it will save you about $2500

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Old 04-16-2012, 12:21 PM   #3
Beachcruiser's Avatar
Join Date: Feb 2012
Location: Raleigh, NC
Posts: 429
I'd use the 4.0 head, too. Have it surfaced & checked for cracks, of course.
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Old 04-16-2012, 01:56 PM   #4
Join Date: Apr 2012
Posts: 5
Definitly will consider the 4.0 head. and i had already seen the Mopar conversion kit, but didnt want to have to spend $2500-2600 to get it. Just wanted to make sure everything would fit correctly and run smooth.
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258 , 4.2 , fuel injection , wrangler

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