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Jeep Wrangler YJ
YJ General Discussion
Help identifying engine
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<blockquote data-quote="machoheadgames" data-source="post: 440414" data-attributes="member: 18789"><p>I mean you can probably get it running, but it will be a lot of work and rewiring. The updated block relocated the AC to be below power steering. If you don’t have AC then that will be alright. The alternator is on the same side and in the same location, uses a very different alternator with different wiring. Definitely need the TJ wiring for that and will need to adapt it to the YJ body, as in powering the YJ PDC and such. </p><p></p><p>Water pump is a newer 5 bolt design (better) and uses a spin on fan clutch instead of 4-bolt. Those are actual improvements so not a bad gig there. Engine mount brackets are different but will land in the same place so no issues there. </p><p></p><p>Wiring is going to be your biggest issue. Find a place to fit the TJ pcm and then do whatever needs to be done to the wiring to make it happy. </p><p></p><p>The speedo isn’t too bad. 1991 had cable speedo but fuel injection so it used a hybrid speed sensor which reported electrical speed data to the PCM and worked a cable signal to the cabled speedo gauge. The 1991 is a reed switch (2-wire) and the 92+ is a Hall effect (3-wire) so they are different but they both provide the exact same data. You will be able to make the TJ pcm happy with the 91 2-wire speed sensor </p><p></p><p>92+ YJs and all TJs use the same electrical speed data so once you get the wires straight it should work. </p><p></p><p>It’ll actually be a pretty cool project if you can get it running, though it won’t be “easy.” Doing things like extending all of the wiring to the PCM is going to be the part that sucks…while keeping all the wiring straight and comparing the TJ wiring diagram to the YJ so it all hooks up right. Especially since an 89 didn’t have fuel injection so it’s different than newer YJs also. But it can be done.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 440414, member: 18789"] I mean you can probably get it running, but it will be a lot of work and rewiring. The updated block relocated the AC to be below power steering. If you don’t have AC then that will be alright. The alternator is on the same side and in the same location, uses a very different alternator with different wiring. Definitely need the TJ wiring for that and will need to adapt it to the YJ body, as in powering the YJ PDC and such. Water pump is a newer 5 bolt design (better) and uses a spin on fan clutch instead of 4-bolt. Those are actual improvements so not a bad gig there. Engine mount brackets are different but will land in the same place so no issues there. Wiring is going to be your biggest issue. Find a place to fit the TJ pcm and then do whatever needs to be done to the wiring to make it happy. The speedo isn’t too bad. 1991 had cable speedo but fuel injection so it used a hybrid speed sensor which reported electrical speed data to the PCM and worked a cable signal to the cabled speedo gauge. The 1991 is a reed switch (2-wire) and the 92+ is a Hall effect (3-wire) so they are different but they both provide the exact same data. You will be able to make the TJ pcm happy with the 91 2-wire speed sensor 92+ YJs and all TJs use the same electrical speed data so once you get the wires straight it should work. It’ll actually be a pretty cool project if you can get it running, though it won’t be “easy.” Doing things like extending all of the wiring to the PCM is going to be the part that sucks…while keeping all the wiring straight and comparing the TJ wiring diagram to the YJ so it all hooks up right. Especially since an 89 didn’t have fuel injection so it’s different than newer YJs also. But it can be done. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Help identifying engine
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