Dando Posted March 11, 2014 Share Posted March 11, 2014 Ok so I am going to rip apart my dd 95 XJ for the 4wd conversion, the engine has twice the mileage as my MJ but runs better smoother, and I know everything that has happened to it for the past 10yrs. What are the pros and cons of swapping the engine and keeping the renix system or going with a full harness swap to get all the HO stuff? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted March 11, 2014 Share Posted March 11, 2014 I have an HO in my Renix. It can be done. The advantage of the HO stuff is OBD II, but Renix Jeeps aren't terrible to diagnose. Link to comment Share on other sites More sharing options...
wvzj Posted March 11, 2014 Share Posted March 11, 2014 It's your Jeep man. If you feel more comfortable having the HO in there go for it. I Would personally keep the renix setup, just because I like to tinker and tune them Link to comment Share on other sites More sharing options...
cruiser54 Posted March 11, 2014 Share Posted March 11, 2014 Cruiser’s HO into Renix Swap This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block. The HO and Renix have some differences but none that can’t be overcome very easily. Any HO engine from an XJ or ZJ through 1999 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. You’ll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender. You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical. You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications. The HO block will have a plug in the coolant galley on the driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s place just as it is on the Renix. It requires a 5/16” square drive or a modified 3/8” drive that has been ground down to fit. Do this before installing the engine. As for the knock sensor, which is located just above the oil pan on the driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case. Revised 03/28/13 Link to comment Share on other sites More sharing options...
Dando Posted March 12, 2014 Author Share Posted March 12, 2014 Thank you all for the responses but I guess I should have phrased my question better. I will definetely be taking the engine from the 95 and putting it into the 90 MJ. I already know that I will either reuse the renix system on the newer engine or take all electrical from the 95. My question is which is regarded as the better and more reliable setup? It's a ton of work for me either way but just want to do this as few times as possible. Also my 95 runs good, my 90 runs like $#!&, rough idle, runs very rich, etc. I'm gonna try to address these issues over the next two weeks but if I keep the renix system wouldn't all these problems be transferred to the new engine as well? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 12, 2014 Share Posted March 12, 2014 Alot more work to convert the injection system to 95. Renix is easy and there's a ton of support here. Link to comment Share on other sites More sharing options...
mvusse Posted March 12, 2014 Share Posted March 12, 2014 I have an HO in my Renix. It can be done. The advantage of the HO stuff is OBD II, but Renix Jeeps aren't terrible to diagnose. OBD II didn't show up in Jeeps until 1996. His 95 HO system is OBD I. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted March 12, 2014 Share Posted March 12, 2014 OBD II didn't show up in Jeeps until 1996. His 95 HO system is OBD I. Ah, you're right. Well, it's not Renix for sure lol. To the OP, not saying Renix stuff is bad either. Link to comment Share on other sites More sharing options...
Dando Posted March 12, 2014 Author Share Posted March 12, 2014 Thank you everyone, getting a bunch of snow right now but Friday should be nicer I plan on doing the renix tips that day, so if I can get the renix system running correctly it should be just as reliable as the obd1 system I currently drive correct? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 12, 2014 Share Posted March 12, 2014 Thank you everyone, getting a bunch of snow right now but Friday should be nicer I plan on doing the renix tips that day, so if I can get the renix system running correctly it should be just as reliable as the obd1 system I currently drive correct? Correct. MORE reliable with the tips done. Link to comment Share on other sites More sharing options...
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