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Thread: 1.8 GDI legnum fast idle

  1. #1

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    Justin
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    Jul 2014
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    27-01-2019
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    Tokoroa
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    97 vr4 legnum
     

    1.8 GDI legnum fast idle

    Hi guys,

    How do I reset the idle on a 1.8 GDI legnum? it idles around 2200rpm sometimes more, sometimes less but not usually less than 1800, unless I put the AC on then it almost wants to stall. Actually it stalls quite easily when trying to back out the driveway. Is it a case of grounding something and manually setting the idle or is there a procedure for letting the ecu relearn its idle? or should I be looking elsewhere for the issue?
    Cheers
    Justin

  2. #2
    crazydriver81's Avatar

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    Stefan
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    Jan 2009
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    30-01-2022
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    Leipzig area
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    Legnum 25ST-R
     
    Check BIS Screw or SAS setup. Next one is to check ISC motor? Probably only Plug of the ISC loose?
    the one and only...Pearl White Legnum 25 ST-R...registered in Germany - now featuring a 6A13TT engine (unless you know otherwise)


  3. #3

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    Name
    Mark
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    Nov 2012
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    17-11-2016
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    United Kingdom
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    Guildford
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    Ra99iart Legnum
     
    Just had similar issues on my vr4 fl leggy. Engine sounded very hissy, obviously an air leak of sorts. Found to be a cracked idle stepper motor. Bought a new one and put it on and a bit of improvement but still uneven idle and still sounded like a steam train. So brake cleaner bottle out and squirted all vacuum pipes ....... No change until a bit of brake cleaner got on the throttle body and hey presto perfect idle, turns out throttle body gasket has failed. New one fitted and all good!

  4. #4

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    Name
    Justin
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    27-01-2019
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    New Zealand
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    Tokoroa
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    97 vr4 legnum
     
    Thanks guys, you steered me in the right direction. I found the TPS was loose and could be swiveled easily. Are these things like a 1g or 2g DSM? I ask because I have always used V-faq to fairly successfully sort out issues like this on my older 4g63 mitsis.

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