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16 valve 740 converted to 8 valve 700

posted by  Silverstone on  Sun Sep 28 05:00 CST 2003
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I have put a 8 valve engine into what use to be a 16 valve 740. I had to change the wiring loom. Now I have no spark no fire. The engine turns round, but won't fire up. Any suggestions?








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    16 valve 740 converted to 8 valve 700

    uid 7350's pic
    posted by  Cliff8928 on  Sun Sep 28 19:51 CST 2003
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    Put a 16v engine in?

    But seriously, check that your flywheel/flexplate is positioned correctly and that you have all the connections good at your reference (crank position) sensor and power stage, etc...

    You might even check and make sure you get a code 1-1-1 in the diagnostic mode for both ECUs Then I'd proceed to the higher level diagnostic mode (modes 2 and 3 as described in the FAQ) and make sure you're getting feedback to and from the ECUs

    Cliff Scott
    89 DOHC740








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      16 valve 740 converted to 8 valve 700

      posted by  Silverstone on  Tue Sep 30 03:36 CST 2003
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      thanks for your help. I didn't change the ECU's round. I got this 740 given to me but the block was cracked. It was much cheaper to buy a broken down earlier 740 with 8 valve engine. So I did and am putting that 8 valve into the 16 valve. I have the ECU unit from the 8 valve will try and change it and see what happens.
      Thanks again








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        16 valve 740 converted to 8 valve 700

        uid 7350's pic
        posted by  Cliff8928 on  Thu Oct 2 07:18 CST 2003
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        I would still think that a 8v would run on a 16v's ECU... the fuel maps might not be anywhere near correct, but it should at least start...

        too bad for having to buy another car for the 8v engine.... there's a yard not too far from here with a good 16v in it...

        Cliff Scott
        89 DOHC740








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    16 valve 740 converted to 8 valve 700

    posted by  someone claiming to be j on  Sun Sep 28 06:00 CST 2003 [RELATED]

    did you change ECU,Fuel injection control units?







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