Neep help ID'ing odd engine code - JeepForum.com

 
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post #1 of 6 Old 02-14-2013, 12:41 PM Thread Starter
ForestJeep89
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1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Bellingham
Posts: 121
Neep help ID'ing odd engine code

I have between cylinders 2 & 3 a machined base with the code:

8 03 C X 30.

I figure (from reading),
8=1988
03 = March
C=258 2bbl
X=???
30=30th day of March


Does anyone know what the X next to the C means? And do I have the correct meaning for C, or is CX a different code?

I've looked at a 87-88 FSM, even though this jeep is an 89, different AMC engine code lists, etc. but still can't find it.

I do know it has a rebuilt motor in it from a engine builder in Spokane, not sure if it's the original that came with the 89 or a replacement.

Help appreciated. Thx!

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post #2 of 6 Old 02-14-2013, 01:38 PM
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
This is all I can find

(MX = a 4.0L 8.7:1 compression ratio engine with multi-point fuel injection system).
The HX is coming up as this: HX = a 2.5 liter = [150 CID] 9.1:1 compression ration engine with a multi port fuel injection system.
The YJ got the 258ci engine through 1990, then it finally went to the HO (ChryCo controls, OBD-I) 242ci. It was the last vehicle to be produced with the 258ci AMC engine.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
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post #3 of 6 Old 02-14-2013, 06:28 PM Thread Starter
ForestJeep89
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Thx for checkin. I guess I'll keep digging.
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post #4 of 6 Old 02-14-2013, 10:12 PM
ROTTEN
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1994 YJ Wrangler 
 
Join Date: May 2011
Location: SGF
Posts: 768
8=1988
03 = March
C=258 2bbl
X=???
30=30th day of March

If a fresh yj just started its 258 2bbl back on march 30th of 1988 what would it be doing(x)

The answer is obvious...

Winning

I'm new
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post #5 of 6 Old 02-14-2013, 10:13 PM
jokerchief462
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1989 YJ Wrangler 
 
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Way to go Rotten:2thumbs up:

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
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post #6 of 6 Old 02-15-2013, 08:20 AM Thread Starter
ForestJeep89
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1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Bellingham
Posts: 121
Quote:
Originally Posted by ROTTEN View Post
8=1988
03 = March
C=258 2bbl
X=???
30=30th day of March

If a fresh yj just started its 258 2bbl back on march 30th of 1988 what would it be doing(x)

The answer is obvious...

Winning
haha thats great! ill take it
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