Question about 1993 Isuzu Pickup

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Pickup shuts off when stops at a traffic light. I increase the idle but now not a steady idle. it hunts up and down

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  • rchang62 Oct 04, 2010

    No luck so far, There is a component on the firewall which has vacuum hoses attached and electrical wires. It is labeled "IDLE" What is it's use and how do i check it?



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Ensure that there is no misfire. Check that the spark plugs are OK, ensure that there is fuel circulation, and check the air filter adn fuel cap (try removing it for testing).

Check the MAF and AIT sensors. This two sensors detect the air flow mass and the air flow temperature, and determine the amount of air to be mixed with fuel in the injection.
Both sensors are located in the air intake and are both common cause for idleing problem.

Check IAC (idle air control) valve. This opens and closes to let extra air in the mixture when the engine is idleing.

Check the vacuum system. The vacuum system is used to recirculate engine gases. If there is a vacuum leak you get a leaner mixture, resulting in engine running rough particularly at idle, when vacuum makes a bigger difference.

Other problems like a defective EGR valve for example, may affect idle, but will also create big problems when driving.

I think I have listed all problem. If possible pul OBD1 codes using a Mercedes OBD1 scanner (go to authorized garage). Standard OBD2 scanners do not work on this car.

Good luck.


Posted on Sep 12, 2010

  • Ginko
    Ginko Sep 12, 2010

    Errata: in my last comment talking about OBD codes I wrote Mercedes. I meant Isuzu, sorry about the typo. The rest of the solution is Ok.

    Pay particular attention to vacuum, this is tested reading pressure with gauge while heating or
    spraying with carb cleaner the vacuum hose (I use heating, but for safety
    reasons it should be done by a mechanic). If there is a leak you will
    see pressure going up.

    Most common reason for idle problem is air
    intake and sensor. Check temporary removing filter. Check the fuel
    circulation removing fuel tank cap. Check the sensors by disconnecting
    wires and seeing if that makes any difference. If that makes no
    difference, the sensor is bad. Clean the MAF sensor screen. This engine
    should have both MAF and iat. check them both. Check idle control cable
    and valve.

  • rchang62 Sep 14, 2010

    Thanks for the tips, I am not working on the problem at the moment but will get back to you whenever I do those checks more throw.



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