03CL55AMG Posted July 1, 2011 Report Share Posted July 1, 2011 OK so I got an 88 ecu for my 87 quest and when I pulled the old ecu out it was also from an 88 at least that is what was marked on it in black marker, so I looked at the numbers between the two and they are all the same except the 88 I was putting in had a A on the end. Here is what the numbers are maybe somebody can tell me what the difference is, here are the numbers for the one that was in the car when I got it and is marked 88 quest #E2T13674. Ok here are the numbers for the one that I put in that is also marked 88 quest # E2T13674A, notice it has the A on the end ?. there is also a bigger number above the smaller numbers on the label on both ECUs # 6394, not sure what all these numbers mean but maybe you guys can help me, thanks. Link to comment Share on other sites More sharing options...
vbrad511 Posted July 1, 2011 Report Share Posted July 1, 2011 The bigger numbers are the ones that matter. The 6394 is an 87 ECU, unless the internals have been swapped. 88-89's end in 0197. Link to comment Share on other sites More sharing options...
Shelby Posted July 1, 2011 Report Share Posted July 1, 2011 as i recall 87 ecu's are mount'd connectors up,,88/89 ecu's are mount'd connectors down , you may have an 88 not an 87 , most 87's with 88 ecus still have the 87 ecu case but with 88 internals the 87 ecu had a single board the 88/89 had a smaller daughter board mount'd on top of the base board Link to comment Share on other sites More sharing options...
Indiana Posted July 1, 2011 Report Share Posted July 1, 2011 1984 IgnitorMD071942 1985/86IgnitorMD071942MD093767 "P" series 1987IgnitorMD109942 1988/89IgnitorMD125748 ----------1984ECUMD071084 ManualMD084583 Auto 1985ECUMD084582 Manual MD084583 AutoMD090798 "P" series manual 1986ECUMD101175 ManualMD101176 AutoMD101177 after 10/85 w/intercooler 1987ECUMD111820 Manual/Auto MD106394 w/intercooler 1988/89ECUMD120197 ----------1984DistributorMD061593Governor setMD607784Vac Adv UnitMD607785 1985/86DistributorMD061593MD093766 after 12-84 Governor setMD607784MD611368 for 3766 Vac Adv unitMD607785MD611360 for 3766 1987DistbibutorMD109937MD109938 w/intercoolerGovernor setMD607784 for 9937 MD611368 for 9938 Vac Adv UnitMD611360 1988/89DistributorMD119754Governor setMD611368Vac Adv UnitMD611769 Link to comment Share on other sites More sharing options...
03CL55AMG Posted July 1, 2011 Author Report Share Posted July 1, 2011 Thanks guys, looks like i had an 88 unit in there already the one i had pulled out had 0197 in marker written on it so I will check to see what I put in may be an 87 ecu. Link to comment Share on other sites More sharing options...
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