Is a w124 ECU "plug and play"

Discussion in 'Electronics' started by gt-83, Jun 21, 2011.

  1. gt-83

    gt-83 Hardcore MB Enthusiast

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    As the title really, just need to know if a ke control unit (ecu) is plug and play or if it needs to be coded in any way, say for ignition, locks, etc to suit a specific car (1987 260e)
     
  2. neilrr

    neilrr MB Club Veteran

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    Plug & play.
     
  3. WDB124066

    WDB124066 MB Club Veteran

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    Don't they have a way of knowing what car they are in and being uncooperative if you want to swap them into another car........??
     
  4. grober

    grober MB Club Veteran

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    They are not "coded" in the way more modern units are. They are used solely for control of the injection system-- the ignition system being a separate unit. There are minor differences between units however, manual gearbox cars having a different part no to automatics for example and differences between 4 and 6 cylinder cars. Just how different these units are I don't know but best to get one from a similar car and the nearest age possible as the injection system evolved over the years.
     
  5. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    Only the later efi cars ecu's are coded, the early ke-jetronic ecu's are not and can be swaped.
     
  6. OP
    OP
    gt-83

    gt-83 Hardcore MB Enthusiast

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    Thanks guys, thats the answer i was hoping for, as graeme knows ive had a spot of bother and i have a definite ecu fault, which i will replace as soon as one turns up (cheap),, ive just spent the night in the garage, took the plug out from the idle control valve (ecu fault) and put a bypass switch in the coolant temperature sender (which increases revs when disabled allowing me to simulate a cold start without an idle control valve!) i like playing:)
     
  7. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    I wonder what would happen if you used a 3.0 ecu? Its the same m103 engine after all.
     
  8. OP
    OP
    gt-83

    gt-83 Hardcore MB Enthusiast

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    that did cross my mind, but the poor old girl has done 220000miles!
     
  9. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    Depending on how much you like the car it may be cheaper to drop in a 3.0 engine and ecu, even if you find a 260 ecu, you wont know if it's ok till you fit it.

    A donnor car would be a better option.
     
  10. OP
    OP
    gt-83

    gt-83 Hardcore MB Enthusiast

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    Its fine with the quick fix ive just done , bangernomics i guess, its what would happen to it if it were exported!.......when a ecu turns up i will fix it properly, just that i cant justify hundreds of pound on an ecu repair
     
  11. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    Bangernomics! I love it. :D
     

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