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First startup JDM engine

Discussion in '1st Gen. Tacomas (1995-2004)' started by Oddball, Jul 2, 2018.

  1. Jul 2, 2018 at 9:23 PM
    #1
    Oddball

    Oddball [OP] Well-Known Member

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    Am in the final throes of installing a JDM 5VZ (3.4L V6) in my '98 Tacoma. Day-amn there is lots of wiring in these things. Anyway, before the first start I want good fuel and oil pressure. I'm going to squirt some oil in the plug holes, and I've already poured fresh 10-30 over the valve train when I swapped valve covers from the old engine. I've read where I can disconnect the plugs and turn the engine over for, what, 15-20 secs to get the oil into all the bearings.
    But wondering how to get fuel pressure to rail so that the truck starts right away. If I disconnect small wire from starter and turn key will the pump run and build up pressure?
     
    PennSilverTaco likes this.
  2. Jul 2, 2018 at 9:24 PM
    #2
    PennSilverTaco

    PennSilverTaco Encyclopedia of useless information...

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    That's EPIC! How did you make it emissions-compliant?!?!
     
  3. Jul 2, 2018 at 9:32 PM
    #3
    Glamisman

    Glamisman Well-Known Member

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    unless the motor has been sitting for a very long time (years) it shouldn't be necessary. You can pull the starter relay and jump the terminals and crank it over with the key off to build up oil pressure before you fire her for the first time.
     
  4. Jul 2, 2018 at 9:36 PM
    #4
    Bishop84

    Bishop84 Well-Known Member

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    If you disconnect the small wire to the starter, it won't crank.

    Easiest way to make sure it doesn't start is to disconnect the 3 coils. This will allow fuel pressure to build, oil pressure to build, and it won't start.

    You'll be good, don't worry too much.

    Make sure your grounds are good, especially the little 10mm one on the intake.
     
  5. Jul 3, 2018 at 11:06 AM
    #5
    Oddball

    Oddball [OP] Well-Known Member

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    Thanks much! Very useful info.
    To PennSilverTaco: Having done this before with other cars (Honda, Nissan, Acura...), I've learned that the basic JDM engines (bottom end and heads) are the same. So are most of the sensors. So you basically just have to switch over the intake (and sometimes exhaust) manifold(s) from the 'old' engine to the 'new' one - so that all your hoses and hookups are exactly the same. (I also had to swap the 2WD-style pan with the 4WD one from original motor.) Obviously, I bought a gasket set and put all new gaskets on for each of these procedures. Bottom line is that, when you get done, the JDM motor is set up exactly the same as the motor that was in the truck originally. So I SHOULD have no probs passing CA smog. FWIW, the engine I'm replacing passed smog fine a few months before it sucked water into #3 cylinder at 290K miles. Also FWIW, I've always had good luck with JDM engines - the ones they always advertise as having "no more than 50,000 miles". I've probably done 5-6 of them in the last 30 years and they've all performed very well.
    Thanks again for the tips!
     
  6. Jul 3, 2018 at 12:19 PM
    #6
    Glamisman

    Glamisman Well-Known Member

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    I too have put quite a few JDM motors in vehicles and like you describe, swapping of oil pans in kind of the norm. I will go one step further and take a main and rod cap off to inspect the bearings, take a photo and put her back together. When the buyer asks about the motor I can show his technition exactly what is going on with any startup OBDII scans, actual and pending. Having said that, I usually have 3 or 4 buyers interested in my next project.
     
  7. Jul 3, 2018 at 1:12 PM
    #7
    Oddball

    Oddball [OP] Well-Known Member

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    Glamisman - that's a great idea! Little late now for this motor, but the next one I do I will also take off rod and bearing caps and photo their condition. Thanks again!
     

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