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'89 motor swap.

Discussion in '3sge' started by j_man354, Feb 27, 2008.

  1. j_man354

    j_man354 Guest

    I just recently bought an 89 GTS and found out shortly after that there was a MAJOR oil leak which lead to a blown piston. I found a new motor out of another 89 GTS and we started swapping parts over last night. Allready I've noticed a few minor differences. We were thinking maybe the new motor was out of a car with ac. Was that an option on the 89 gts? The difference was the tensioner pulley on the alternator belt was smooth not grooved so in looked like the back of the belt was supposed to go on it. Another thing was the oxygen sensor in the exhaust manifold on the new motor. on my car it was on the lower exhaust pipe. Is the wiring harness going to be completely different on the new motor? What about the computer will that work with this?

    The car is over at my friends shop so I can't check any of the parts numbers but I'll try to get them tonight and post it up here.
  2. sr5punk

    sr5punk Well-Known Member

    if the o2 sensor is on the exhaust mani then you have an 86-87 gt-s. do you have the face lift on that one?
  3. Dman_23

    Dman_23 Guest

    Your new motor had AC. Not a problem though. Just swap over the tensioner and all of the altenator mounting parts from your original motor.

    And it sounds like the new motor might be from a different year than you thought, as sr5 suggested, though I've never actually seen a 88-89 motor personally. You did say that your car came with the o2 sensor on the lower pipe, but the new motor has it on the manifold, right?

    I did previously do a lot of research in the BGB (toyota repair manual) to find out the electrical differences between the 86-87 and 88-89 motors. They are as follows:

    1)The 88-89 motor had a temp sensor for the egr system. The 86-87 does not. (assuming you are in a country that had egr)

    2)The 86-87 motor had a single wire o2 sensor. The 88-89 motor has a four wire o2 sensor.

    Because of these 2 reasons the ECUs are not interchangable.

    I'll let some one with more experience with the 88-89 motor help you work around this, but basically you would want to use the intake, head, and exhaust mani of the engine that you are using the ECU and wiring from, if possible.

    It would help to know what you got with the new engine - wiring, ecu etc.
  4. sr5punk

    sr5punk Well-Known Member

    can you get pics of the front of both cars clearly showing the front lights and grill? that will tell us. unless you are not in the U.S.
  5. j_man354

    j_man354 Guest

    I dont think this was the original motor to the car it came out of. The place on the intake where the egr and stuff was is plated off. The wiring harness looked the same as mine though. All the wires matched. Heres some pictures of the new and old.

  6. Mafix

    Mafix Owner Staff Member Administrator Donated!

    i see egr block off plates
  7. j_man354

    j_man354 Guest

    ok Im retarded. the wiring harness was different. apparently the other car didnt have cruise. so we swapped out the wiring harness. so whats the deal with the egr block off plate?
  8. rye

    rye Well-Known Member Donated!

    it still has an egr though...the tubing is on the intake manifold...unless thats part of his old engine
  9. slow_yota

    slow_yota Well-Known Member

    Thats what i thought too, that has to be two different engines.
  10. j_man354

    j_man354 Guest

    well I started it up today and it seems to run great. just need to finish up a couple things tomorrow and it should be good to go.

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