Question about 2000 Toyota Tacoma PreRunner

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2.7 liter engine has a miss. replaced plugs, fuel filter, egr switching selinoid, and downflow o2 sensor. Was told by mechanic that they have found that valves needed to be adjusted.

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  • cliffewilson May 07, 2010

    Yes it has coil packs. I will check those again. I used to mechanic yrs ago. one post i read said the valves are self adjusting. do you know if they are adjustable.



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Before you spend that much more money - replace the distributor cap and rotor (if equipped). If it has a coil pack (or packs) have it (them) tested. Also, under the pack(s) will be a modular. This cannot be tested however, if it looks melted (whitish), or you see bubbles, it is bad. It should have a smooth sleek surface on the top.

If these are not the problem, than the mechanic is right - and you may need to have the lifters adjusted - valves replaced - if you're going to have them adjusted, personally, I'd have the valves, rods and lifters replaced; if it's affordable. If not, have them adjusted.

Have the mechanic decide which would be best (and use your jugement/ go with your instincts - based on your vehicle mileage.

Please let me know if you need any further assistance.


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Posted on May 07, 2010

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  • Brandon Bruce
    Brandon Bruce May 07, 2010

    I personally have never heard of "self-adjusting" valves, however they have managed to create a V8 Engine that cuts down to four cylinders at 55 it's possible.

    It is a possibility. At this point I would trust the mechanic and have them adjusted - doesn't make sense to me though to have them adjusted if they are "self-adjusting"...come to think of it, I think subaru may have done that as well.

    I apologize if I have not been helpful, as I have never come across "self-adjusting" valve scenerios...


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    P.S. -- Get a second, and even a third opinion from other mechanics in your area or on Fixya. You can browse TOP Experts from the home page.



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