The 90 had a Renix computer system, the 96 has a Chrysler one. You need
the computer and harness from the 96 to get things going.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
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Shep wrote:
>
> asd relay or efi main? If you scan it do you see cranking rpms.
> > wrote in message
> ups.com...
> > Hey guys,
> >
> > I've got a very frustrating problem here. Customer brought in a 1990
> > Jeep cherokee limited, 4whldrv, automatic. We replaced the engine with
> > one from a 1996. All the appropriate electronics were switched from
> > the old engine to the new including, distributor, cap, rotor, coil,
> > CPS, flywheel, intake and exhaust, all injectors (already on old
> > intake). The problem is we now have a no start/no spark condition.
> > This swamp is common at our shop, (newer 4.0L into older jeep) and
> > always goes off without a hitch. This is the first time I've run into
> > this. We've replaced the CPS, coil and ignition module check out O.K.,
> > Distributor checks out. We even put all the suspect parts into another
> > jeep and they worked fine. The computer has also been replaced but to
> > no avail. Any input would be appreciated. Thanks.
> > Jesse
> >
>
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