trail rate this
NAXJA Forum User
- Location
- Cape Coral, FL
I'm sure this has been covered 100 times. I searched too. What's involved in swapping a HO motor into a Renix jeep?
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Renix to HO
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joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
HO = 91-01, possible exclusions 00-01 for distributorless engines with different accessory mounts.
If you are keeping the vehicle Renix, just put the Renix sensors on the engine, with the only thing that might be a small challenge is attaching the knock sensor.
If you want to convert the vehicle to OBDI/II, that is another whole can of worms.
If you are keeping the vehicle Renix, just put the Renix sensors on the engine, with the only thing that might be a small challenge is attaching the knock sensor.
If you want to convert the vehicle to OBDI/II, that is another whole can of worms.
trail rate this
NAXJA Forum User
- Location
- Cape Coral, FL
Joe I'm glad you replied. I want to convert from renix to OBDI. What's in the can of worms I'm going to open.
Slip Kid
That'll buff right out
- Location
- A cornfield in IL
You need an entire OBDI donor vehicle. You need to swap the entire wiring harness, fuseblock, computers, ect. Yes that means every wire in the entire car. I did not do this, but there are a few people I have seen on here who did. I adapted the TPS, let the EGR go away, and swapped a ton of parts from the Renix onto the HO motor. It's got to be easier than taking the whole car apart to replace wiring. If you don't want to adapt a tps, or you live in California, or whatever, you can swap the Renix head and intake onto the HO block, then your TPS is plug and play, as well as many other sensors on the head/intake, and you get to keep your EGR system. EGR requires both the Renix intake and exhaust manifolds, and the intake manifold requires the corresponding head as well as the manifold gasket.
IMO, swapping all the wires would not be worth it, as the Renix system is superior in several ways.
Slip Kid
That'll buff right out
- Location
- A cornfield in IL
It is supposed to adapt to mods better. And it can be completely diagnosed with a multimeter.
trail rate this
NAXJA Forum User
- Location
- Cape Coral, FL
How do I adapt the sensors to the HO engine, intake and throttle body? Can I get rid of the EGR?
- Location
- on the beach in Ocean View, VA
easiest way is to swap the rotating assembly and reuse your existing Renix intake/exhaust setup. Because the TPS changed with the infusion of Chrysler parts, you'll be trying to adapt a newer TPS to the older harness if you swap intake and throttle body (possible, I guess-- but a painus in the anus)
I'd never tell someone (publicly) to remove the EGR and form a block off plate, but for testing purposes, it can be done.
The remainder of your sensors should remain Renix (reuse old ones) and be fairly easy to locate homes to accomodate them. The only one (as mentioned previously) that may be "homeless" is the knock sensor which does nothing unless you have a problem (sends a signal to retad timing if pre-ignition is sensed)
I'd never tell someone (publicly) to remove the EGR and form a block off plate, but for testing purposes, it can be done.
The remainder of your sensors should remain Renix (reuse old ones) and be fairly easy to locate homes to accomodate them. The only one (as mentioned previously) that may be "homeless" is the knock sensor which does nothing unless you have a problem (sends a signal to retad timing if pre-ignition is sensed)
Slip Kid
That'll buff right out
- Location
- A cornfield in IL
If you wish to use the HO's head and intake, the Renix TPS must be adapted to work on the HO TB. You also need to swap the MAT sensor onto the HO intake. The EGR system was removed in 91, and it will not work with the HO intake manifold. The function of this system was compensated for in other ways including the camshaft, so the HO engine does not need it to reduce its emissions - however good luck explaining this to the guys if you need to pass a visual inspection. Removing emissions equipment is illegal everywhere, and logic has little to do with law. If you have any doubts about being able to get away with this, just swap the head/intake, doing so saves a lot of other swapping work as well. (it's funny that I learned all this on here, and for whatever reason people care now. 4 years ago the removal of emissions parts seemed like common practice on here)
If you do use the HO intake, there is a TPS adaptor available from Hesco
http://www.hesco.us/shop.asp?action=details&inventoryID=45563&catId= or you can make your own. There should be some threads on here about making your own. The Renix exhaust manifold must also be modified to work in this case, as there is a hole in it for the EGR tube. It might be easier to make the HO header work, but I didn't try this. Regardless of exhaust manifold, the intake/exhaust gasket needs to be for the intake/head being used.
There's a bunch of other stuff, yet still easier than swapping harnesses. You need to use the Renix's alternator. Regardless of which intake you are using, the Renix fuel injectors need to be installed in it. Yes it will run with HO injectors, but you will get crap for gas mileage. As stated there might not be a hole for the knock sensor, and if there is it won't be threaded. If you can figure out what size the threads are(not a common SAE size) then you can tap it. If not you can just hook the thing up and hide it somewhere. I've heard you can actually just remove it, but I've also heard that it needs to be plugged in so mine is plugged in. There is a temperature sensor in the Renix block, and there is no hole for this in the HO block. This sensor should fit in the HO's thermostat housing. This is the sensor for the ECU. The Renix, and some HO's(I think all OBDIs), have another temp sensor in the head, this is for the gauge. I don't know if the sensors themselves fit in eachothers' holes, since I just adapted the wiring and hacked my cluster to make the HO's gauge work. You will most likely want to try to switch these sensors if possible. You also need to use the Renix's distributor, and the sensor that is in it. The other CPS, the crank sensor, must be swapped to - no matter what year transmission and engine are used, the CPS and the flywheel or flexplate used must match the engine electronics used. Therefore, if you are using swapping transmissions as well, you must swap the flywheel or flexplate if you are running Renix, and likewise, if you are switching to OBDI, then you need to find said part from an OBDI vehicle.
No, it is not a direct bolt in even if you do it the easiest possible way.
I'm sure there's other things I have forgotten to mention. Basically everything with a wiring connector on it needs to match the ECU being used, even if it doesn't seem like it would.
If you do use the HO intake, there is a TPS adaptor available from Hesco
http://www.hesco.us/shop.asp?action=details&inventoryID=45563&catId= or you can make your own. There should be some threads on here about making your own. The Renix exhaust manifold must also be modified to work in this case, as there is a hole in it for the EGR tube. It might be easier to make the HO header work, but I didn't try this. Regardless of exhaust manifold, the intake/exhaust gasket needs to be for the intake/head being used.
There's a bunch of other stuff, yet still easier than swapping harnesses. You need to use the Renix's alternator. Regardless of which intake you are using, the Renix fuel injectors need to be installed in it. Yes it will run with HO injectors, but you will get crap for gas mileage. As stated there might not be a hole for the knock sensor, and if there is it won't be threaded. If you can figure out what size the threads are(not a common SAE size) then you can tap it. If not you can just hook the thing up and hide it somewhere. I've heard you can actually just remove it, but I've also heard that it needs to be plugged in so mine is plugged in. There is a temperature sensor in the Renix block, and there is no hole for this in the HO block. This sensor should fit in the HO's thermostat housing. This is the sensor for the ECU. The Renix, and some HO's(I think all OBDIs), have another temp sensor in the head, this is for the gauge. I don't know if the sensors themselves fit in eachothers' holes, since I just adapted the wiring and hacked my cluster to make the HO's gauge work. You will most likely want to try to switch these sensors if possible. You also need to use the Renix's distributor, and the sensor that is in it. The other CPS, the crank sensor, must be swapped to - no matter what year transmission and engine are used, the CPS and the flywheel or flexplate used must match the engine electronics used. Therefore, if you are using swapping transmissions as well, you must swap the flywheel or flexplate if you are running Renix, and likewise, if you are switching to OBDI, then you need to find said part from an OBDI vehicle.
No, it is not a direct bolt in even if you do it the easiest possible way.
I'm sure there's other things I have forgotten to mention. Basically everything with a wiring connector on it needs to match the ECU being used, even if it doesn't seem like it would.
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Well, everyone beat me to the answer, to change over to OBDI you would want all the harness and electronics, sensors, the instrument panel. Having the donor vehicle sitting right next to yours would be the easiest. If you went to OBDII then you are getting into the fuel pump and sender too.
