Question about 1994 Toyota 4Runner

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Toyota 4 runner cold performance problem

Hello ED.

I saw that you had posted on my problem but can't get to the post. when i click the link it just shows what i have written. i am using firefox perhaps thats it. a user "ginko" posted a link but when i track back to see use it it was gone. now i am really confused. please help thanks

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  • dkgeneralmai Nov 07, 2008

    fan spins, not freely with some resistance, i has a new fan clutch installed with the rebild.

    removed hose to throttle body. small amount of staining, soot and discoloration. cleaned it.
    disconnected the throttle cable, flapper moves freely without sticking.
    could not find screw on top of throttle plate.

    i noted that the throttle cable is mounted over the intake manifold. could it be that it is sticky inside and when manifold heats up, it frees up the accelerator pedal ?

    i am headed down to ask the tech that tried to set timing if he encountered the problems you outlined.

    thank for the hellp

    doug


  • dkgeneralmai Nov 07, 2008

    gas pedal is free. depressing gas pedal give full throttle at trottle body.

    tech checked TPS, ok
    tech checked MAFM, ok

    when jumping E1 and Te1, tech says shud bypass computer timing advance. which is does not.
    checking response at throttle body he says this is "very poor response"
    he recheck timing and says it was maybe a 1/2 degree out.

    we advanced distributor a bit. drove ******* mtn roads for 45 min as test. ran much much better, no pinging.

    on return he says that he thinks it could be that the timing belt was set one tooth off (as you indicated)








  • dkgeneralmai Nov 08, 2008

    One more question. advancing the timing seems to have been the major issue. that means that the set-up is probably one tooth off as you said. So the tech set the timing by guess work, as he cannot get a good reading after jumping across the two points. My question is there a way to set the timing correctly, with a light, as it is set up now ? Getting the setup changed is going to be the same $ out put as a timing chain upgrade and cannot be done just yet.
    Also, tech and I were discussing the CAT. is there a way to tell when/if it needs replacing sans the smell/hiss test ?
    and thanks so much for all you help Ed, on this issue and those in the past. Sorry that you had to draw flak from some for asking others to stand down so we could get on with it. You build great merit with your service.
    Sincerely
    doug


  • Toyota Ed May 11, 2010

    Yes, there is a possibility that the throttle plate may stick with temperature swings.

    Please advise if the linkage to the gas pedal is free.

  • Toyota Ed May 11, 2010

    Oh, forgot to address the heating issue. Do this for me: Go out, raise the hood. Now, with the engine turned OFF, grab onto the cooling fan and try to spin it. Advise me of "exactly what it feels like " while you are trying to spin it. This is important for me to offer an opinion. Thanks.

  • Toyota Ed May 11, 2010

    Comment by Toyota Ed:

    Ok. What you have are several issues. Let me tackle them one by one.
    TIMING: The base timing should be 10 degress BTDC. To properly set the timing, you or your tech needs to JUMP terminals "E1" and "Te1", in the small box under the hood. Then connect the timing light, and set it to 10 degrees. If this setting can NOT be acheived with motion of the distributor, as I suspect, you have a timing belt that is off one tooth. This will explain the popping and gurgling sounds. In regards to the throttle being stiff, I would suggest to you to remove the tube going from the air cleaner box to the throttle plate/throttle body area. This is the circular flapper where the gas pedal cable connects to the engine. Remove the tube, and inspect the interior of the throttle plate area, It should be VERY clean, and shiny. If it is very dirty, black & crusty, clean it with good carb cleaner. Here is a real good test: the cable to the throttle bodyu is easily removed. Take the cable off, and manually open the throttle valve...Does it still stick? If so, this is where you need to start. Keep cleaning it until it is spotless. Remove the screw on top of the throttle plate and spray cleaner down into the hole. Replace the screw, start it up, and reset the screw to reset your base idle. Post back if you desire additional information.

  • Toyota Ed May 11, 2010

    I'll see if I can copy & paste it for you.

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  • Toyota Master
  • 1,861 Answers

One tooth off will cause you all of those problems. If your tech does not have the proper timing info, I will e-mail you a .pdf with the correct procedure. The graciousness of a FixYa would be greatly appreciated.

Posted on Nov 08, 2008

  • Toyota Ed Nov 08, 2008

    Thnaks for the FIxYa. Much appreciated. Glad to help! Feel free to call on me anytime.

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