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4Runner won’t stay running

Discussion in '2nd Gen 4Runners (1990-1995)' started by MocaGBA, Jan 12, 2022.

  1. Jan 12, 2022 at 4:21 PM
    #1
    MocaGBA

    MocaGBA [OP] New Member

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    Me and my friend recently bought a 1994 4Runner and it will die as soon as I start it up unless I have my foot in the gas pedal. Im wondering what can cause it to do that and how to fix it. I’ve got the 3vze engine
     
  2. Jan 13, 2022 at 12:13 AM
    #2
    DIRTRCR13

    DIRTRCR13 New Member

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    could be a lot of different things... MAF sensor, timing sensor, bad gas, timing is off on the cams/ crank, multiple mis-fires vaccum leak, plugged exhaust... the list could be very long or it could be something as a connector not on all the way. is the Check Engine light come on when you are able to get it to run?
     
    Thatbassguy likes this.
  3. Jan 13, 2022 at 12:21 AM
    #3
    MocaGBA

    MocaGBA [OP] New Member

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    I got a code 22, Engine coolant temp sensor which the previous owner had broke off so we got it replaced. Also got a code 24 but I don’t know where that sensor is located.
     
  4. Jan 13, 2022 at 4:46 AM
    #4
    DIRTRCR13

    DIRTRCR13 New Member

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    What is the name of said sensor so we can help you locate it...
     
  5. Jan 13, 2022 at 3:26 PM
    #5
    MocaGBA

    MocaGBA [OP] New Member

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    Intake air temperature sensor
     
  6. Jan 14, 2022 at 12:53 AM
    #6
    DIRTRCR13

    DIRTRCR13 New Member

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    Usually on the back side of the intake manifold. 2-3 wires on the connector. Seen a few go bad but only causes the engine to run rich but not cause them to "not run." But there is a first for everything....
     
  7. Jan 14, 2022 at 8:42 AM
    #7
    Justthemechanic

    Justthemechanic New Member

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    The intake air temp sensor is in inside of the VAFM. Here is a link to an article to test the circuit. These readings are for the 22RE, but they are probably similar for the 3VZE. You want to measure the resistance between THA and E2, it should be 2K to 3K ohms resistance at 68 degrees F. If the circuit is open or the resistance is way off, that will trip a code 24.

    http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml

    Let us know what you find.
     
  8. Jan 16, 2022 at 12:58 PM
    #8
    negusm

    negusm New Member

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    While fixing those sensors is good, I don't think they will be the cause of it not running at idle.

    I'm thinking a vacuum leak or bad gas. Might be a bad injector or 3. Or like was mentioned...a bunch of things.

    How well does it run when you have your foot on the gas?

    How much do you have to rev it to keep it running? Or do you just need a small bit of extra throttle to keep it running? Can you keep it running indefinitely or does it fight you?

    White or black smoke out the tail pipe?

    Pull the plugs and see what they look like.
     
  9. Jan 16, 2022 at 1:03 PM
    #9
    heyniko24

    heyniko24 New Member

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    Does it only happen when it’s cold ? Could be the cold start injector
     
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