86 740 Turbo to 89 740 aspirated engine swap

Discussion in 'Volvo 740' started by Volvo Rookie, May 16, 2006.

  1. Volvo Rookie

    Volvo Rookie Guest

    My friend has an 86 740 Turbo wagon with a 230FT engine but the turbo
    and engine are hooped. I went and pulled an 230F engine and computer
    out of an 89 740. The harnesses to the computer are the same, just the
    computer partnumbers are different of course. The engine starts and
    runs but it starts surging. It revs up and down until it finally
    stalls. I'm having a problem timing it. With the turbo computer it is
    way worse, which I expected. I'm wondering if there are any sensors
    that are no longer used that I may have to short the leads together or
    trick in some way. The ignition system is a jetronic and I have
    noticed that there are resistors in line with the wire to the fuel
    injectors on the turbo but the wiring diagram shows that they are not
    there for the aspirated engines. I've removed the leads and shorted
    them together as the junction shows on the diagram. No change in the
    way it runs. There must be something simple I'm missing but have no
    idea what. Please Help!

    Cheers,
     
    Volvo Rookie, May 16, 2006
    #1
  2. Volvo Rookie

    Arnold Guest

    Have you checked the Mass Air Flow Sensor?
    I think they are different.
     
    Arnold, May 20, 2006
    #2
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