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Cant figure whats wrong with it going to sell it.

Discussion in '4 Cylinder' started by silver tacoma, Jul 19, 2009.

  1. Jul 19, 2009 at 2:29 PM
    #1
    silver tacoma

    silver tacoma [OP] Member

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    :( I have been trying to figure this PO301 out for about six months now.

    new plugs
    no vacuum leaks I can find
    coils are good fuel is good? put some injector cleaner in it.
    pulled the injectors after 135k to have them cleaned the guy said they did not need it $100 down the drain :(
    when the check engine light came on I reset it and it would go 130 miles or so then came back on. Now it will come on in 10 to 15 miles used to come up 301 then random mostly 301 now.

    2002 prerunner 4 door will just have to dump this thing on craigs list for 4k. I am all out of ideas would make me sick to take this to a repair shop and dump 800 into it to tell me it was a sensor. any ideas from anyone????
     
  2. Jul 19, 2009 at 3:09 PM
    #2
    XBrown

    XBrown Spartacus!

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    I don't recall what year they switched to coil on plug, but if you have plug wires, check them for cracks. That's the first thing I would do. That, and check if the little tops of the spark plugs are screwed on tight.

    Also, is the check engine light solid, or flashing about once per second?
     
  3. Jul 19, 2009 at 3:54 PM
    #3
    EnolaGaia

    EnolaGaia Well-Known Member

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    What other codes has it been throwing? Are the others also all misfire codes (P030X)?
     
  4. Jul 19, 2009 at 4:12 PM
    #4
    jfr02

    jfr02 Well-Known Member

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    how is it running.before you put more money in it you should check compression and do a cylinder leak down test.also you could perform a top engine clean.i think the stuff that some of the people use here is seafoam.just do a search for sea foam
     
  5. Jul 20, 2009 at 7:10 AM
    #5
    silver tacoma

    silver tacoma [OP] Member

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    The truck comes up with 301 all the time and 300 every 5th time or so. the coils are one each per plug. I have herd of the sea foam they have it a wally world. I used lucus be for in it seemed to keep the engine light off longer? I will have to try a compression check.

    cold be the coolent sensor saying the truck is cold and making it to rich? well will havt pull it in the garage and run a compression check @ 135k it still should have good compression my moms honda @ 380k still runs strong.

    Larry
     
  6. Jul 20, 2009 at 8:21 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Did you gap the new plugs?
     
  7. Jul 20, 2009 at 7:11 PM
    #7
    silver tacoma

    silver tacoma [OP] Member

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    might try NGK I have autolite in the truck now.
     
  8. Jul 20, 2009 at 7:52 PM
    #8
    fletch aka

    fletch aka www.BeLikeBrit.org

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    It seems to be focused on cylinder# 1, I would put OEM plugs back in, put 100-200 miles on it and see of the engine light comes back. I'm also wondering if the coil pack may be weak on #1. Maybe somebody knows the answer to this, can you swap the coil pack to another cylinder and see if the code moves with the coilpack?
    Send a PM to Chris4X4, he is scary smart when it comes to tacos.
     
  9. Jul 20, 2009 at 7:57 PM
    #9
    jfr02

    jfr02 Well-Known Member

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    yes you can swap coils out and see if the code moves with it thats a good idea
     
  10. Jul 20, 2009 at 9:04 PM
    #10
    silver tacoma

    silver tacoma [OP] Member

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    I moved the coil to 4 and the problem stayed with #1 what should the compression be?
     
  11. Jul 20, 2009 at 10:18 PM
    #11
    XBrown

    XBrown Spartacus!

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    I'd say a good rule of thumb would be about 150 psi for a strong motor. Also, they should all be within 10% of each other.
     
  12. Jul 21, 2009 at 5:02 AM
    #12
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Have you changed the wires? You could swap #1 with another one and see if it follows or stays.
     
  13. Jul 21, 2009 at 5:38 AM
    #13
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    Get the autolite's out of the truck & spend the coin on the iridium denso's that are supposed to be there. My certified preowned had these pieces of shit in there & they made the truck run weird. They are also shorter tip where the spark was farther up in the combustion chamber than it is with the correct denso plugs. I did not have cel but truck runs much better(normal) with the denso's. 67.00 for plugs sucks but the way it ran with fuck plugs was much worse.


    edit - oops, you said 2002 so the denso iridiums aren't stock that year but would still ditch the fuckolites for some proper denso factory spec plugs. They shouldn't be 67.00 either.
     
  14. Jul 21, 2009 at 11:09 AM
    #14
    silver tacoma

    silver tacoma [OP] Member

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    Were can you get these plugs. I looked on line at checker and autozone they have NGK and bosch What should I use? 2002 Taco :confused:
     
  15. Jul 21, 2009 at 11:11 AM
    #15
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  16. Jul 21, 2009 at 11:19 AM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  17. Jul 26, 2009 at 4:02 PM
    #17
    silver tacoma

    silver tacoma [OP] Member

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    OK I have been trouble shooting this truck on and off for six months. #1 miss fire. cleane all the injectors plugs coils.

    I got it. I think the vavlve is stuck open on # one. all the cylinders have about 130psi and #1 verys from 60-90psi. one time I was checking the pressure and it stopped making pressure for a few turns. it was going wow wow wow then smooth as it was still turning. I had all the plugs out to turn easier. this lead me to belive the valve was stuck open:confused:

    ok what should I do if I put some sea foam in the oil will this unstick it? because when it first started it would happen on and off. I thinks it just needs some cleaner.:confused: I really don't want to pull the head. do you think this is a job I can do.

    completed jobs... how hard is the job to pull the head and install new belt?

    replaced valve body in th350
    replaced heads on a chevy 400 sb
    installed cam
    removed and install a rabbit engine and clutch
    replaced a 79 olds diesel with a chevy 350
    removed and installed 72 vw motor after replacing cylinders
    dissembled and ship a kx500 threw the mail to Japan, then reasembled
    did a valve adjustment on a 84 benz diesel

    how much would this job cost me if I had it done?:eek:
     
  18. Jul 26, 2009 at 4:16 PM
    #18
    jfr02

    jfr02 Well-Known Member

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    it seems you have the mechanicl knowledge and know how.if you have the time and a place to do it then you should.remove the head yourself and take it to a engine shop to have the head work done.removing the head on this motor is a fairly simple job.you will save a few hundred dollars doing this youself you could use your savings to replace your timing chain depending on milage or put a cam in it and get alittle more power.but in my opinion i would try the seafoam cleaner before tearing it apart.
     
  19. Jul 26, 2009 at 8:39 PM
    #19
    XBrown

    XBrown Spartacus!

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    If you have, or have access to a leakdown tester, use one of those. It's an easy test, and it tells you where you're losing compression. For example: piston rings, head gasket, intake valve, or exhaust valve.

    Also, pull the PCV valve out while it's running and see if smoke comes out of the valve cover.

    Another trick to diagnose exhaust valves, is while it's running, try and cover the tailpipe with a sheet of paper. If it flutters like it's getting sucked in, you've lost an exhaust valve.
     
  20. Jul 31, 2009 at 2:55 PM
    #20
    silver tacoma

    silver tacoma [OP] Member

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    when I had my injectors cleaned for no reason:mad: the truck had 138k the injectors flowed like new the guy said:( he looked up some fixes for the same problem one mechanic had a stuck valve on #2 and gave it a whack with a hammer. I laugh when I herd that, I think its a good idea now:). well going to try it and report back on what happens.:rolleyes:

    were can I get a good Manuel to fix the head:confused: or has anyone seen this on the web:confused:

    well, wish me luck
     
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