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Unread 05-24-2008, 08:45 AM   #1
dkroll
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1989 MJ Comanche 
 
Join Date: May 2008
Location: Independence, Missouri
Posts: 178
Need Engine identification help!

Hello,
I own a 1989 Comanche with a tired engine. I found a person on the net who has a "Jeep engine" which is a line six and is fuel injected. He is not able to tell me any information of what jeep it has came out of. My question is:
How can I tell the difference between a 4.0 L engine and a 4.0 L (H.O.)engine? Are there physical differences or are there specific Numbers to look on the block? Can I make a 4.0L HO work in my truck without doing too much to swap it (such as the wire harness)? Any info anybody has that will help me with this purchase would help a bunch!
Thank you!
Dkroll

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Unread 05-24-2008, 09:42 AM   #2
jeepicon-com
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I believe you should look for vacuum lines, I think in 1991 they switched from Renix 4.0L (which you have now) to the HO. Also the intake ports on the HO heads are higher on the HO. And I believe you would have to swap the ECU and header....
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Unread 05-24-2008, 10:26 AM   #3
XJohnnyC
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Have him look for the casting numbers on the block and cylinder head. Then post them up here.
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Unread 05-29-2008, 03:49 PM   #4
MTJeepXJ
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1991 XJ Cherokee 
 
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If im not mistaken the Renix was TBI(throttle body injection) and the HO is MPI(Multi-port injection). that may be how you can tell.
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Unread 05-29-2008, 03:51 PM   #5
maddzz
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1989 MJ Comanche 
 
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Quote:
Originally Posted by MTJeepXJ View Post
If im not mistaken the Renix was TBI(throttle body injection) and the HO is MPI(Multi-port injection). that may be how you can tell.
The renix 4.0 is MPI for an 89.
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Unread 05-29-2008, 03:55 PM   #6
MTJeepXJ
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Oh ok. my bad.
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Unread 05-29-2008, 06:43 PM   #7
Pete M
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1988 MJ Comanche 
 
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Renix 4.0s tend to have a silver valve cover, HOs tend to have a black valve cover.
Jeep on!
--Pete
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-88 MJ; 4.0L, ex-2wd, TJ ax15/231, 78 Ford D44 w/spool, 9" w/posi, 33" trXus MTs, custom roll-bar/bumpers/etc.
Also an 86 MJ Metric ton and 2 '90 MJs
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Unread 05-30-2008, 03:21 AM   #8
dkroll
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1989 MJ Comanche 
 
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Thank you for the info. I found a H.O. and compared it to mine. The intake ports seemed a little higher and I noticed that my Remix has a shroud plate over the manifolds and the H.O. did not. That was the only thing that was different that I could see.
Wish I could find a 91 or 92 Eliminator with a ruff bed as a donor for my parts truck.
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Unread 05-30-2008, 07:20 AM   #9
SoloCamo
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1988 MJ Comanche 
 
Join Date: Aug 2006
Location: Spring Hill, FL
Posts: 978
Quote:
Originally Posted by Pete M View Post
Renix 4.0s tend to have a silver valve cover, HOs tend to have a black valve cover.
Jeep on!
--Pete
Good to know, thanks!

Well if I ever repaint my valve cover again (currently painted black) it's going back to silver
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1988 Jeep Comanche- SporTruck | 4.0L Renix |AW-4 | 4x2
Engine: Cutout+Insulated Airbox | Ford Design II 19lb injectors
Suspension: Gabriel VST Shocks
Tires: Firestone "Firehawk Indy 500" 235/70/15's
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Unread 06-04-2008, 01:37 AM   #10
carnuck
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If the manifold is still on it, the Renix has an EGR and the HO doesn't.
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