Need Engine identification help! - JeepForum.com

 
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post #1 of 10 Old 05-24-2008, 07:45 AM Thread Starter
dkroll
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1988 MJ Comanche 
 
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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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post #2 of 10 Old 05-24-2008, 08:42 AM
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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post #3 of 10 Old 05-24-2008, 09:26 AM
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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post #4 of 10 Old 05-29-2008, 02:49 PM
MTJeepXJ
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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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post #5 of 10 Old 05-29-2008, 02:51 PM
maddzz
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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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post #6 of 10 Old 05-29-2008, 02:55 PM
MTJeepXJ
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Oh ok. my bad.
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post #7 of 10 Old 05-29-2008, 05:43 PM
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

-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
Projects/wheelin' pics: picturetrail.com/petermontie
My email: petermontie@hotmail.com
ComancheClub.com/forums
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post #8 of 10 Old 05-30-2008, 02:21 AM Thread Starter
dkroll
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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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post #9 of 10 Old 05-30-2008, 06:20 AM
SoloCamo
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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

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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post #10 of 10 Old 06-04-2008, 12:37 AM
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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