Takedown

Im currently in the process of swapping an ax-15 and a newer 92 H.O engine in my 89 XJ. Everything is swapped in and ready to rock but I've ran into a few snags. Im trying to get use out of the newer higher flow intake mani to work with my existing non-HO engine harness. I have a few connectors left over than I have no idea what theyre for. I sound like a newb I know but this is my first 4.0 manual swap so cut me some slack lol.

My issue is Im not getting any injector ticks or spark. I did jump the engine harness connector pins to trick the auto ecu but still no fire.

Any ideas?

xjboy14

First off you may want to post some pics of the left over connectors so we can get that straightened out

DFlintstone

Your post title might have thrown some of us off. There are big differences there. (87-90 had an ECU, 91 on has a PCM). Short story, you match the sensors to your ECU, (about all of them I think). Now sit down. You need the flywheel from the earlier Renix to talk to the CPS that your ECU requires. The "Hall effect transducer", uses notches/holes in the flywheel/flexplate to make the signal for the ECU. The notches changed between 90 and 91. (The 91 on HO CPS is three or four wire and very different).

Cruiser has a writeup on the swap, it defenantly works well.

WAZ your original an automatic, or a manual?

DFlintstone

OK, Cruiser's tips are right on top if you click on my sig. (I highly recommended you take a look) Here is # 17 >

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 1998 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 07/24/2012

Takedown

Yeah I have yet to do the tps mod to fit the renix tps on the H.O. throttle body. And I am not using nor did I know I had to use the renix flywheel so thats probably the biggest issue right now. Ill have to scoop one up.

oldguy52

I'm in the middle of doing the very same thing with 94 into 89. I went the full monty and pulled every last stitch of wiring, controls and dashboard from the 94 into the 89. That should about take care of any compatibility issues :-)

DFlintstone

Wow. That might deserve it's own thread. "Switching Renix ECU to HO/OBD-1 PCM" I guess anything is possible if you work at it hard enough. Besides the more obvious, you are going to need a rear 02 sensor and some Evap stuff...it's a longer list I'm sure. Getting that through smog here....Idk.

I wouldn't try it, I love my Renix!