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Unread 03-12-2010, 11:16 PM   #1
CJ7Rubicon
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1227747 ecm differences

Is there a difference between a ecm from a 4.3 v6 and one from a 350 v8?Some pins are broken in the one I have where the wire connects,so i need to go to the jy and get another.This is going on a 258.I have searched,but did not find an exact answer.

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Unread 03-13-2010, 04:11 AM   #2
gmakra
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The ECM is the same the chips are different. So pull your old chips and replace them into your new ECM.
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Unread 03-13-2010, 04:50 AM   #3
Mike Romain
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??????? ECM?

On your 258, the ECM has gone into limp home mode and is no longer functioning because you do not have a feedback carburetor on there. It can be bypassed easily and even be tossed in the trash to make the timing work properly.

The 258 is a straight six 4.2L engine that does not share much with a 4.3 V6 or a 350 other than the name 'engine' so I really don't understand the cross reference question.
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Unread 03-13-2010, 07:52 AM   #4
CJ7Rubicon
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Mike,sorry for the confusion.I am doing the jy tbi,getting rid of my carb.
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85 CJ7,Clifford equipped 258,TBI,RE4.5,35" Claws,Aussie lockers,8.8 rear.
Blue Jeep Club Member #134
http://www.youtube.com/watch?v=1tQ_AE6iqis
http://www.freedomoffroad.org
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Unread 03-13-2010, 10:04 AM   #5
jfwireless
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gmakra is correct, the 1227747 ECM's are all the same, just the images on the prom are different for the different programming required for different engines.. You can read the broadcast code label on top of the prom, here are just some examples, this is usually on the outside of the ECM case as well:
  • ABUL 1987 Astro with the 4.3 Z TBI,1227747
  • ACSU0024 1987 V 1500 (Suburban) 5.7L, 700R4, 4x4, 3.73 axle ratio, and AC.
  • ACSW 87 C1500 pickup, 5.7L TBI w/T700R4,1227747
  • AFDY6022 5.0 automatic
  • AJUK 88 C1500 pickup, 5.0L, Auto, 1227747
  • AKAJ1147 1987 K 1500 5.7L, 700R4, 4x4, 3.73 axle ratio, leaded compatible (no closed loop) and AC.
  • AKAL 87 5.7L automatic
  • AKAR1180 5.7L manual leaded fuel option (no closed loop)
  • AKDX2088 4.3L automatic
  • AKSN 88 4.3L 5spd
  • AMUR 88 C/K pickup, TBI EFI system, 1227747
  • ANLW5469 89 5.7L automatic
  • ANLZ5483 5.7L automatic
  • ANTZ 89 7.4L manual
  • APAB 4.3L manual 3.42 rear end ratio
  • ARHT7465 5.7L manual
  • ARPC7509 5.0L manual
  • ASDU 1991 Chevy C-1500 5.7L V8 Auto
  • ASDW9544 5.7L manual
  • ASDZ9578 5.7L automatic
  • AZFT9503 7.4L automatic (THM400)
Jim
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Unread 03-13-2010, 11:29 AM   #6
CJ7Rubicon
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Thanks wireless,I did find that off of the binder site.My broken one is the ABUL.

I have a chip flashed for my engine due to the cam,header and bore.Im glad i can get any 747 and use my flashed chip and the original longer chip in the other slot.I just wasnt 100% sure.
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Blue Jeep Club Member #134
http://www.youtube.com/watch?v=1tQ_AE6iqis
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