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91 motor in a 90 xj


 
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Muddinmorethanu
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Joined: 14 Feb 2006

PostPosted: Tue Mar 21, 2006 8:50 pm    Post subject: 91 motor in a 90 xj Reply with quote

I have a 90 xj with a blown 4.0..I have a beatup jeep i bought with a 4.0h.o out of a 91 xj.. Will it swap right over? I have the WHOLE jeep to use for parts...
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Muddinmorethanu
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Joined: 14 Feb 2006

PostPosted: Wed Mar 22, 2006 6:55 am    Post subject: Reply with quote

no one knows if i have to cahnge anything? The 90 is non highoutput..The 91 is highoutput...
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Code3TJ
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Joined: 01 Jan 2004
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PostPosted: Wed Mar 22, 2006 7:50 am    Post subject: Reply with quote

91 was when they made a lot of changes (hence the change to the HO engine.) Seems like the intake and exhaust manifold changed. If I were you, I'd change the computer and everything engine related.
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Muddinmorethanu
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Joined: 14 Feb 2006

PostPosted: Wed Mar 22, 2006 8:43 am    Post subject: Reply with quote

my question is will the ecu just plug right in? I know ill have to run a wire for the knock sens..But other than that is that it? What im asking is i dont have to switch the harness do i? Or should i just strip it down to a short block?
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ThePhantum
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Joined: 23 Jan 2004
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PostPosted: Wed Mar 22, 2006 8:52 am    Post subject: Reply with quote

You shouldn't have to switch the harnesses. Like Code said, I would swap the ECU in with the motor.
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