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Valve JOB

Discussion in '1st Gen. Tacomas (1995-2004)' started by gmata, Feb 1, 2010.

  1. Feb 1, 2010 at 3:13 PM
    #1
    gmata

    gmata [OP] Well-Known Member

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    After dealing with my Check engine light code p0300 and p0301 since i bought my car i've finally come to the conclusion it has to be a valve that is sticking a little bit.

    I want to know what parts do i need for a sucessfull valve replacement, do i just need to buy the Valves? maybe gaskets? would it be a good idea to perform anything else while the motor is open since my car has 140,000?
     
  2. Feb 1, 2010 at 3:18 PM
    #2
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    just my opinion.....but if you suspect a sticking valve....maybe run some seafoam thru and see if it will free it up. alot cheaper than a valve replacement.
     
  3. Feb 1, 2010 at 3:37 PM
    #3
    mx04taco

    mx04taco Well-Known Member

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    ^^ thats a good suggestion. but you would much more than just valves to do a proper "valve job." You would need all the gaskets required to do a headgasket. Probably some special tools to get it all apart without breaking something. I would have the valve seats and inserts replaced or machined. Its not worth slapping it all back together and having it doing the same thing a year down the road. But.. I would go with the seafoam idea first. That stuff actually works very well and often does the trick in these type of situations.
     
  4. Feb 2, 2010 at 9:26 AM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What have you done prior to suspecting it's the valve(s)? There are a lot of other things that can cause this code.
     
  5. Feb 2, 2010 at 10:28 AM
    #5
    BRP27

    BRP27 When I grow up I want to be just like Me

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    So far south in Texas my feet are in salt water
    Vehicle:
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    3 in Ultimate ToyTec, set @ 2.5 in. AAL PINCH Weld Mod ( beat the pinch weld over inside the fender) Painted the pinch weld on bottom of cab Black Hi Lift Knock off
    Have you checked the engine compression? It is relatively easy to do.
    Get a compression guage (buy or Borrow).
    Take out your spark plugs
    Check each cylinder pressure as you have the engine turned over
    Chech the factory spec for the acceptable range, looking for the lowes cylinder

    If you have cylinder that reads low, I would go ahead and do rings and rod bearings while you have it apart.

    Seafoam first it can't hurt any thing.
     
  6. Feb 2, 2010 at 12:19 PM
    #6
    gmata

    gmata [OP] Well-Known Member

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    Thanks,

    Yes i have checked everything possible i took it to a very nice mechanic in town and he also double checked everything he connected something to the car and he could read the missfires in real time.

    We checked the compression and it is not super low, but still a littl bit lower and it is never the same it changes + - 5 psi everytime. So it has to be a valve or something else inside the motor.

    I will try sea foam see what happens.
     
  7. Feb 2, 2010 at 1:00 PM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What plugs are you using?
     
  8. Feb 2, 2010 at 1:12 PM
    #8
    gmata

    gmata [OP] Well-Known Member

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    Hehe, I've done my homework don't worry i am using Denso plugs i bought from the delearship.
     
  9. Feb 2, 2010 at 1:36 PM
    #9
    mx04taco

    mx04taco Well-Known Member

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    did you do a cylinder leakdown test?
     
  10. Feb 2, 2010 at 2:12 PM
    #10
    gmata

    gmata [OP] Well-Known Member

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    I am not sure about a leak down test...

    I am about to pour seafoam into my motor, can anybody tell me where exactly is the PCV Valve hose i think i know which one is it but i dont want to put it in the wrong place. Thanks
     
  11. Feb 2, 2010 at 5:27 PM
    #11
    BRP27

    BRP27 When I grow up I want to be just like Me

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    So far south in Texas my feet are in salt water
    Vehicle:
    04 4X4 Tacoma SR5
    3 in Ultimate ToyTec, set @ 2.5 in. AAL PINCH Weld Mod ( beat the pinch weld over inside the fender) Painted the pinch weld on bottom of cab Black Hi Lift Knock off
    +/- 5 PSI is not bad in my opinion, miss fire is bad, leakdown test is also simple a good mechanic can do it. It will tell if you have a valve problem. You will hear or see leakage out exhaust or intake
     
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