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Bouncing Idle

Discussion in 'Forced Induction' started by SolLess16, Apr 27, 2005.

  1. SolLess16

    SolLess16 Senior Member

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    I just helped a friend turbo his z6 , everything went good except he has a bouncing idle from 1500 to 3000. He is running stock injectors and tuned with a vafc2 - any ideas on why its doin this?? im guessing the vacuum lines but everything looked alright - any help is apreciated thanks --- also he is throwing no codes
     
  2. projectxspeed

    projectxspeed Senior Member

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    My civic did the same thing. My solution was to bleed the air out of the coolant. This fixed my surging idle.
     
  3. 94DOHCSol

    94DOHCSol Junior Member

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    hey, I have a 94 Sol with the stock b16 and I had the same problem. My car would jump from about 900 rpm up to about 1300 whenever it was warmed up and idling. I had it at the dealer 4 times and they couldnt figure it out. I replaced the map sensor, IACV, 2 coolant sensors, and had the idle screw adjusted. Finally the dealer adjusted the idle all the way to its lowest setting which corrected the problem. The vacuum lines were checked repeatedly and no leakes could be found. I am not sure how to adjust the idle myself, but I would recommend trying this approach, its cheap and it worked for me with no ill side affects so far. Good luck!
     
  4. hondagod98

    hondagod98 Junior Member

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    are you throwing a check engine light? if not, getting the air bubbles out of the coolant is a good possibility - air bubbles in the coolant will affect the iac valve (on back of intake mainfold) this valve is activated by the coolant temp and adjusts idle accordingly - or you have a bad iac valve... not a cheap part either
     
  5. Slammed90Lude

    Slammed90Lude Senior Member

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    coolant air bubbles
    vacuum leak

    these are the two i've seen cause this

    i had a major vacuum leak (read: intake manifold gasket) which caused this, but something very minor could have the same results

    adjusting the idle all the way down should not be the solution
     
  6. SolLess16

    SolLess16 Senior Member

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    Thanks guys , ill try bleeding the air out tomorrow when i get a chance - thanks again and any other advice is apreciated
     
  7. reckedracing

    reckedracing TTIWWOP VIP

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    watch those air bubbles, could cause overheating issues
     
  8. pissedoffsol

    pissedoffsol RETIRED

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    stock injectors on a turbo car??? :bash:
     
  9. SolLess16

    SolLess16 Senior Member

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    well replaced the IACV , flushed and refilled the coolant, checked all vacuum lines- and still a bouncing idle - any way that it could be a TPS or anything?? any help is apreciated - thanks
     
  10. SolLess16

    SolLess16 Senior Member

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    also tried adjusting the idle on the front of the throttle body which did nothing - anywhere else i can try adjusting??
     
  11. jdmeg6

    jdmeg6 Senior Member

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    :werd:
     
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