Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
'87 engine is a Renix, which is not OBD1- compliant. Most of the sensors and connectors on the Renix engines are different from the '91-'95 OBD1 and the '96-'01 OBDII engines. However, you can use a HO block & head on a Renix, but the easiest way to make other things work is to use the intake manifold and exhaust from a Renix - otherwise you'll got a lot to do. You can fab an adapter to use a Renix TB on a HO intake, but the sensor issue is still there, among a few other things.
Also keep in mind you need the flex plate from your renix engine, HO flexplate is different from the renix ones.. HO engines also lack knock sensor, but IIRC some of the HO blocks have an unthreaded hole for the sensor mounting bolt.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***