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IAC Pintle

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by Apoc, Jul 23, 2006.

  1. Apoc

    Apoc New Member

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    Hey peoples, just wondering why you need to adjust the IAC valve pintle to 28mm? Wont it just re-adjust itself? i mean it moves up and down anyways till it finds where the car is idling normally, if the pintle is too far out wont it just pull itself back down to a normal range?

    Last time i had mine out i didnt adjust the pintle and when i whacked it back in, the car revved heaps high for a while then it slowly settled back to normal now the car starts fine, idles okay.

    Has this buggered up the range that the pintle can move? is a different voltage to control pintle position now required to obtain normal idle and possibly making my ecu think something it shouldn't? Should i go and actually pull it out and adjust it for any reason?

    Cheers,
    Apoc.
     
  2. Doctor Bob

    Doctor Bob Grandpa

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    moving the pintle manually is a crock as it will re adjust itself to the correct spot when the base idle resets.
    best not mess with it as manually moving it can damage it if not dome carefully


    Rob
     
  3. hakhawk

    hakhawk smooth moderator Staff Member

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    from what i remember in the gregories manual, it says if the pintle is longer than 28mm, its time to replace. not to physically adjust ti to 28mm
     
  4. Apoc

    Apoc New Member

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    "from what i remember in the gregories manual, it says if the pintle is longer than 28mm, its time to replace. not to physically adjust ti to 28mm" - hakhawk

    Nah dude i have a gregories manual and it just says; "If the distance is greater than 28mm, push the pintle towards the valve body while moving it slightly side to side untill it retracts to a distance less than 28mm" - gregory's 1989 print

    "moving the pintle manually is a crock as it will re adjust itself to the correct spot when the base idle resets.
    best not mess with it as manually moving it can damage it if not dome carefully" - Doctor Bob

    This is sort of what i thought, anyone else got any ideas?
     
  5. hakhawk

    hakhawk smooth moderator Staff Member

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    ahh, yep, i remember now, thats what mine says. just been a while saince ive looked at it.
     
  6. Nikkojoe

    Nikkojoe Member

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    Ive replaced an IAC valve before with a new one. You always have to adjust them (the brand new one was greater than 28mm). If it aint adjusted (like i did once) and is bigger than 28mm, the car will stall/not start/not idle. The pintle moves up and down controlling the air flow. If its sealed (ie distance greater than 28mm), then there will be no airflow and hence the car will stall.
     
  7. Doctor Bob

    Doctor Bob Grandpa

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    the car will stall until the IAC resets

    Rob
     
  8. Nikkojoe

    Nikkojoe Member

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    Yeah forgot to add that too. Had to give it a lot of revs before it worked like normal again (this was before i read gregories manual).....
     

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