First start after engine rebuild

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Wtfdustinwtf, Mar 28, 2026 at 8:40 PM.

  1. Wtfdustinwtf

    Wtfdustinwtf Junior Member

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    Hello, did an engine rebuild its all back together gonna fire it up tomorrow. My AI said I should pop put the ignition coils and try to start it for several seconds, pause a minute, try for several more seconds. I understand with standard engine cars this works great. Does this work for the prius system though?

    Also while I'm making a post what's it like to try to start a pushbutton car with ignition coils out? I just keep holding it or something? I don't have experience with first startups after rebuild and am trying to get a feel for how it will go. I assume the fuel pump will get gas going through the fuel line pretty quickly even though I drained the lines right? Thanks
     
    #1 Wtfdustinwtf, Mar 28, 2026 at 8:40 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    With the spark plugs out you could just turn the crankshaft with your electric wrench it only has to go about maybe a hundred RPMs with plugs out should be easy it'll prime oil pump . Not as important as it was 30 yrs ago for sure
     
    #2 Tombukt2, Mar 28, 2026 at 9:40 PM
  3. ASRDogman

    ASRDogman Senior Member

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    You'll get a lot of error codes, and the engine likely will only turn over for a few second, then stop.
    As long as you have oil in the engine, and coolant in the system, and all is back together, start it
    like you normally would.
    It will take a few seconds before it starts, and if all is well, it will run normally.


     
    #3 ASRDogman, Mar 28, 2026 at 10:15 PM
    Tombukt2 likes this.
  4. rjparker

    rjparker Tu Humilde Sirviente

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    It might rattle for a few seconds since the variable timing is not seeing oil pressure but should run unless the usual vacuum line, pcv valve or electrical connector is off.

    Even then it will "sound" like it ran because of the high speed cranking people have not heard before. "It ran for ten seconds and quit".
     
    #4 rjparker, Mar 28, 2026 at 11:30 PM
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