Question about Toyota Pickup

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Hello, My 1981 Toyota truck with 22R W/Carburetor intermittently stalls on idle speed; it is OK and runs on hwy speed but some time not all the time(especially when engine hot) when traffic slows or getting in to stop, it stalls and hesitates to start. I have to pump few times then it starts but I have to keep pressure on the pedal to keep rpm high and going.Then problem goes away as quick as it comes. It is very annoying. I have already replaced, distributor cap, rotor, spark plugs. And checked the fuel level (normal) when problem was present. I appreciate any help. Faik

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  • faikcimen Oct 09, 2010

    Hi! Thank you for your quick respond. I have checked all vacuum hoses and there is no any damaged hose found. Idle speed is normal, nothing wrong with idling. But, I think I am getting closer to solve the problem. I think problem is idle fuel cut off solenoid.

  • faikcimen Oct 09, 2010

    Oh, there is no A/C or power steering.

  • faikcimen Oct 09, 2010

    Dear Caroldon, Thank you for your nice and decent suggestion. I know my problem is caused by carb. Solenoid valve being cut off when it is not suppose to. Computer getting some misinfo. and comanding solenoid to cut off. May be solenoid is sticky( but those things are mostly spring loaded and strong)
    I am also guessing it has some thing to do with gas cap. I have lost (forgotten) my gas cap on a gas pump and I had an other gas cap at home (not for this truck) and I put that on. I will try that get a gas cap from dealer and see what happens. Are you agree?
    Many thanks again.

    Faik.

  • faikcimen Oct 17, 2010

    Hello again, I found the problem. It was bunch cracked connections on fuel emission control unit (or called computer too in Toyota factory manual) I was able to see them magnifying glass. Resolder them all and sprayed and cleaned with old toothbrush. All works well now. Just wanted to share with you. Thank you for your willingness to help.
    Faik

  • faikcimen Oct 17, 2010

    Hello again, I found the problem. It was bunch cracked connections on fuel emission control unit (or called computer too in Toyota factory manual) Which is located left side of clutch pedal. I was able to see them with magnifying glass. Resolder them all and sprayed and cleaned with old toothbrush. All works well now. Just wanted to share with you. Thank you for your willingness to help.
    Faik

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The fault seems evident to be within the carburetor. I think you might have to start from the fuel tank to check if there are impurities present in the tank, if you see the fuel filter dirty or clogged with fine dirt.
In this case clean the tank and change the filter.
Now the possible problem can be the carburetor is blocked on the ports , or the idling valve/jet is blocked.
hence I recommend a full overhauling of the carburetor so that the fuel flow /pressure to the idling is adequate. Clean all porrts/jets as you reset---- please take care to attempt this job using proper tools and torque when removing and resetting.
Once done please check the fuel pump also, crank the engine and take the fuel flow into a bottle to check for impurities.
Now set back ,start the engine and tuning up the air/fuel mixture. Allow the engine to rev up to about 1500RPM while you set the mixture to have the engine running smooth. Now trim down the idle setting of the throttle to reduce to the desired level.
Please make sure the timing is set correct.

Posted on Oct 09, 2010

  • Donald DCruz
    Donald DCruz Oct 09, 2010

    Thanks for your comment.I am happy you were able to sort out. Yes in fact the idle fuel cut must be the reason as it might be erractic with a poor solenoid action.

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Hi! As a first course of action please check on the vacuum hoses. If theres unconnected or worn vacuum hoses the idle will be too low. Please check very carefully. Hope this helps and thank you for using FixYa!

Posted on Oct 09, 2010

  • dj_relly999
    dj_relly999 Oct 09, 2010

    Alrighty, thanks for the clarification. Yes it can be the solenoid, but may I ask if the a/c is on during the incident? Thanks

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