How can I tell if I have an HO or Renix motor?

 

Fill out the background information please?
Don't making us guess. We are here to help.
If you have original 4.0L 88 XJ motor, it's a Renix injection system.
Renix is the base fuel injection system opted in by AMC to feed the 4.0L tallblock assembly.
Different in the XJ than what was offered on the 6 cyl. Wranglers.
HO is cylinder head and exhaust manifold revisions. By the time that occurred the injection system had been evolved by Chrysler. Includes development of the throttle body assembly and engine systems management by the controller circuits.
Remember every organization of humans has the liars division inherent. HO equates about a 2% increase in power. If your tasked job function is Marketing, then you apply the HO badge and talk it up.
My experience is my 95ZJ and 02WJ run better overall than my 89XJ Renix at initial start and warm up. Running is equivalent after that. Both the ZJ and WJ provide approximately a 2% better fuel economy over the XJ.
Improved systems? Overall yes (Spark plug access on the WJ is more tedious).
But at 2% gain overall, I can't really buy in to the "HO" nomenclature.
Don't get me wrong, the 4.0L is the overall engine champion in my opionion.
I've over 750Kkm on the XJ and approaching 1.5millionkm on the three combined. What I consider a half life of the fleet.
If you have an 88, take a good look thru Cruiser 54's tips. Thru them you will learn to love your Renix.

 

I love this response!!! LOL.

May I save it for future use giving you the credit?

 

If your Jeep is an 88 XJ or MJ, go to www.cruiser54.com and do Tips 1 through 5 for starters.

 

Renix has three bolts on the TB, HO has four. My JY has a 90 that is not a Renix so at least some late 90 are HO.

 

No way.

 

I have no idea what background information you are talking about.
I was not asking you to guess.
My question was how can I tell the difference.
If you don't like my question, then don't respond.

 

"No way. "
Supersized, (and bummed) myself. Maybe I'll take some pics.

 

88s were Renix as were all 87 to 90s.

A good way to tell is indeed by the number of bolts holding the throttle body on.

 

Well, there it is. That should settle the argument. 3 bolts vs. 4 bolts. It's a slam dunk.


That's not a 2% increase. That's a 33% increase!

Now that's what I call HO!

 

Hi Cruiser
You are very welcome to use it in part or entirety, no credit required.
I really appreciate your tips and think all can benefit from the application of same.
I certainly have.
ByronW can save a lot of headaches by going thru the tips list and he will be very much more in touch with his Renix side.

 

Thanks. I edited it a bit:

Originally Posted by peep

If you have original 4.0L 87 to 90 XJ motor, it's a Renix injection system.
Renix is the base fuel injection system opted in by AMC to feed the 4.0L tallblock assembly.

Different in the XJ than what was offered on the 6 cyl. Wranglers.

HO is cylinder head and exhaust manifold revisions. By the time that occurred the injection system had been evolved by Chrysler. Includes development of the throttle body assembly and engine systems management by the controller circuits.

Remember every organization of humans has the liars division inherent. HO equates about a 2% increase in power. If your tasked job function is Marketing, then you apply the HO badge and talk it up.
My experience is my 95ZJ and 02WJ run better overall than my 89XJ Renix at initial start and warm up. Running is equivalent after that. Both the ZJ and WJ provide approximately a 2% better fuel economy over the XJ.

Improved systems? Overall yes (Spark plug access on the WJ is more tedious).
But at 2% gain overall, I can't really buy in to the "HO" nomenclature.
Don't get me wrong, the 4.0L is the overall engine champion in my opinion.

I've over 750Km on the XJ and approaching 1.5millionKm on the three combined. What I consider a half life of the fleet.

If you have an 87 to 90, take a good look here: www.cruiser54.com. By using Cruiser’s Tips, you will learn to love your Renix.

 

The reason I ask this question is from all the reading I have done here I was sure I had a Renix.
Then I guy at an automotive repair shop said nope, that is an HO.
So I asked the Question.
Was out of town but will pop the hood this weekend and count the TB bolts.

Thank you for the help.

 

By the way, I am doing a complete? rebuild, my first time.
I need to get some pictures loaded. It will not be a made for TV rebuild, but still, it will be nice.
It is taking longer than I thought and also more money. It will never ever be worth what I am spending on it.
I really enjoy driving this Jeep.

 

Welcome to the insanity.

I compare our hobby to golfers.

They spend $90 per week playing that game. Ours is more productive.