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i am working on a 93 yj we put a tbi 5.7 out of a 98 yukon in. we got the harness and computer from novak. we still need to put exhaust and o2 sensers in but we got it to start with starting fluid but it wont start without it. i am not sure what to check so maybe someone ran into this same problem and can help out.. thanks
 

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i am working on a 93 yj we put a tbi 5.7 out of a 98 yukon in. we got the harness and computer from novak. we still need to put exhaust and o2 sensers in but we got it to start with starting fluid but it wont start without it. i am not sure what to check so maybe someone ran into this same problem and can help out.. thanks
un-hardcore at its finest!
 

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first you need to put in the O2 sensors then make sure that your fuel pressure is between 60-66psi on the rail. your stock yj pump will not feed the vortec 5.7 I just had the same problem with mine (92 yj to 96 vortech5.7)

I used a napa fuel pump which was part #e8228 I believe it is an external pump
 
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