intermittent no idle

Discussion in 'Diagnostic & Repair Tech' started by Holmsey, May 16, 2017.

  1. Holmsey

    Holmsey Member

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    Hi this really is all that is stopping me enjoying my Lexus conversion now. It always needs a bit of throttle to start, wont just start on the button. sometimes it will idle ok, if I rev it and let the accelerator pedal return it usually cuts out. Then is often hard to restart, will start if I keep the throttle wide open.
    Pain in the A*SE when coming up to a junction if I don't keep a bit of throttle on it cuts out, but next time it might idle ok.
    It pulls like a train no misfires or hesitance just the idle problem, I have no fault codes. I've set the TPS, cleaned the IACV (though i'm not convinced it is working, is there a way of testing it?
    New O2 sensors, new temp sensor, crankcase sensor, cambelt etc.. all new condensers in the ECU.
    Any one point me in the right direction where I can look to sort. Cheers.
     
    Last edited: May 16, 2017
  2. gloverman

    gloverman Active Member

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    Which ECU number?

    Test - Unplug IAC. Testing light into one of the middle pins. Start engine and run for 20 seconds , might need some throttle. Turn engine off and tell me if the light goes out straight away or stays on for about 4 seconds. Cheers
     
  3. Holmsey

    Holmsey Member

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    Thanks Gloverman you have come to my rescue again ;o)..... I will do that and get back to you. Just tightened the throttle cable to cheat a tickover for now. I will do the test you suggested not in garage now until Thursday it will be my first task as its a two man job I guess. My ECU is 89661-50160. you did help me with my Oxygen sensor problems a couple of week back.
     
  4. gloverman

    gloverman Active Member

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    No worries. I work on my own a lot so can do that test on my own but it's easier with someone else. I complete the same test at the ECU on pin A28 as well to comfirm thats correct too. Cheers
     
  5. Holmsey

    Holmsey Member

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    Hi just checked the IAC with my test light. Started the engine ran for 20 secs and the light went out straight away when I turned off the key. So what does that indicate? Cheers for your help mate.
     
  6. gloverman

    gloverman Active Member

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    Its not wired correctly. Who wired the engine in?
     
  7. Holmsey

    Holmsey Member

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    I had a guy do the loom for me Bushwacker he had done quite a few. I t then wired in the loom to my Truck. So what wires do I have wrong?
     
  8. gloverman

    gloverman Active Member

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    All of bushwackers early looms had the same issue. Ive sorted a few of them now. PM me and Ill make a few pointers. cheers
     
  9. Holmsey

    Holmsey Member

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    Hi Gloverman, I am not sure how to send you a PM.. I have been on your profile and sent a message not sure if it's a PM ;-).. my pm is holmseyd@talktalk.net Cheers
     

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