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idle problem with a 3S-FE, and introducing myself.

Discussion in 'Diagnosis/Help' started by inmsjxn, Sep 10, 2014.

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  1. inmsjxn

    inmsjxn New Member

    Hi guys. I've been lurking here for a few months and found this forum to be extremely helpful. I live in Mississippi, and back in April I bought a 1988 JDM Celica convertible.

    I've been having some idle issues. With the air con on, it barely runs (drops below 500rpm). My temporary fix is to set idle adjust to 650rpm while air is on. That makes it 1200 with the air off, but better then keeping my foot on the gas on rainy days. There's also an occasional problem when cranking warm, where it will idle somewhere randomly between 500-1500 until it's driven.

    From reading, my likely place to start is the ICS since it's a 3S-FE. here's my problem:
    throttle.jpg
    it's not an ICS, which should have a connector going in. It looks like a IAC from a GE, but the orientation is wrong. Also, I noticed the throttle body only has one vacuum hose coming out of it, instead of 3.

    Anybody have an idea of what throttle body / idle control this is?

    Thanks for any insight you can give.
     
    inmsjxn, Sep 10, 2014
    #1
  2. inmsjxn

    inmsjxn New Member

    i'll settle for anyone confirming that it doesn't look right for a 3S-FE.
     
    inmsjxn, Sep 14, 2014
    #2
  3. 187flatliner

    187flatliner Seat Breaker Donated!

    my 3sfe doesnt look like that and i have an egr valve there as well.
     
    187flatliner, Sep 15, 2014
    #3
  4. capotaingowa

    capotaingowa Well-Known Member

    throttle.jpg adsc01156.jpg

    JDM 3SFE
    Looks normal to me..
    Here is the Link to the image..
    http://www.jdmtigerjapanese.com/toyota-lexus/3sfe-sohc-engine-only-87-91.html

    I would check the following

    1st....
    AC signal to ECU
    If that is not good the ECU does not know to raise the idle when the AC is on..

    2nd..
    If the AC signal to the ECU is good..
    I would check the Idle up VSV next since this is the VSV that the ECU commands to allow more air in the engine.
     
    capotaingowa, Sep 16, 2014
    #4
  5. Stig

    Stig ST162 Guru Donated!

    Interesting...
    JDM doesnt have an AFM, coil or EGR guys, one pipe from the T/B is normal

    Have you checked all your vaccum lines for leaks? I suggest replacing them all with silicone hose
    Is the intake pipe cracked?

    Try adjusting your A/C idle by turning the white adjuster knob (On FE it's at the end of the manifold next to your clutch master cyl
    [​IMG]

    Also next time it messes round when warm I want you to disconnect the cold start injector plug and see if that helps

    Also check your plug gaps are 1.1mm, any smaller and it will do weird shit like you describe when hot

    Here is how my JDM looked
    [​IMG]
    Yes, GE exhaust is a big improvement over stock, as is the huge Corona diesel radiator

    [​IMG]

    T/B looks the same?
    [​IMG]
     
    Last edited: Sep 23, 2014
    Stig, Sep 23, 2014
    #5

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