Question about Toyota Previa

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What is the proper compression reading for a 95 Toyota previa. Can you correctly read compression with a weak battery that is barely turning the engine? The reading is 30 psi

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  • siddikov879 Apr 25, 2010

    I did charge up the battery and did the compression test on all of the cylinders:

    #1- 90 psi
    #2- 10 psi and 90 psi with oil in the cylinder
    #3 - 0 psi and 0 psi with the oil
    #4 - 0 psi and 0 psi with the oil in the cylinder

    Sould i rebuild the engine or get a used one. they rebuild the engine for $300 plus parts

  • siddikov879 Apr 26, 2010

    Thank you, I think i will by another car. this one I bought for $300 and it served me well enough. I will let it rest in peace. Thanks again


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Ideally 120psi +/- 10% across all cylinders is ideal
being that this vehicle is 15 years old I'd worry below 100psi

30psi on one cylinder means...bent valves, bad rings
you'll need to cylinder leakdown to identify the problem but bottom line its time to replace

let me know if I can be of any further assistance!

Posted on Apr 25, 2010

  • Sean Reisdorf
    Sean Reisdorf Apr 25, 2010

    depending on who is doing the rebuilding and weather they will warranty their work will depend on weather you rebuild or replace

    There are very few shops around here that will even rebuild an engine, most just R&R (remove and replace)


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