89 4.0 (renix) controlled with a obd1 ecu. Help! - JeepForum.com
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Unread 01-19-2012, 07:01 PM   #1
rafiki
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1995 ZJ 
 
Join Date: Oct 2010
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89 4.0 (renix) controlled with a obd1 ecu. Help!

I swamped my 95 GC. So I had to replace the engine. I grabbed a 89 Cherokee engine before I knew the engines were different. Right now the engine Mis fires and Rpms are bouncing around. I've swapped everything to the 89 engine. All electronics. Exhaust. And valve cover. I'm wondering if even tho this is a renix engine, with everything swapped over will my obd1 be able to control this engine ok? I have read there are differences in the head but I understood it was mostly air flow things. I still hVe the rad from the old engine and when it warms up I would be able to swap that on the new 89 engine. And help or advise would be great!

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Unread 01-19-2012, 10:48 PM   #2
1986cj
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What flexplate and dist did you use? guys swap the obd1 injection to 258s all the time so I dont know why you cant on a early 4.0
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Unread 01-20-2012, 12:47 AM   #3
rafiki
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The jeep has the 95 flex plate installed. I read somewhere that the exhaust manifold(95) won't line up the intake ports on that head(89). So maybe that is messing up my fuel spray from the injectors? Seems like dirty injectors but they are new. I think my solution is to swap the heads but I thought I would ask before I do. It won't be until the spring anyway. It's over -30 where I live in the winter and I do my work in the driveway.
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Unread 01-20-2012, 05:09 AM   #4
cruiser54
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Quote:
Originally Posted by rafiki View Post
The jeep has the 95 flex plate installed. I read somewhere that the exhaust manifold(95) won't line up the intake ports on that head(89). So maybe that is messing up my fuel spray from the injectors? Seems like dirty injectors but they are new. I think my solution is to swap the heads but I thought I would ask before I do. It won't be until the spring anyway. It's over -30 where I live in the winter and I do my work in the driveway.
No need to swap the heads.

Radiator will be fine. I bet your distributor isn't indexed correctly.
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