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Thread: Won't idle when cold / auxiliary air valve / idle air control valve

  1. #81
    Administrator timsrv's Avatar
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    Re: Won't idle when cold

    Absolutely not a problem . BTW, just thought I'd mention that AC Idle-up diaphragm is one of the few parts you can purchase from Toyota that's cheaper than aftermarket off of rockauto. Last time I needed one I found it on ToyotaPartsDeal.com for $17.86 (I purchased 4 of them ). Tim

  2. #82
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    Re: Won't idle when cold

    wow this has been a great read for me. my poor van has been sitting for close to a year meaning I haven't used it much because I have a new job and don't use the van much. after reading the symtoms I believe my air vale is not working as it should. as usual Tim and the rest have help enormously with facts and pics.. thanx for that all. I spect I have a few bumping around in some Tupperware boxes and will replace it with one. I looked at what I thought will be an attack angle meaning I already have cut out a window in the firewall(hump) and should make this repair a bit easier. now just to be clear when I do start the van it runs just fine for maybe a minute then drops to idle then it just stumbles and rumbles and shakes after it does come to temp it runs kinda normal. think ill wait for a bit warmer weather and some extra time...did I mention its gonna snow here in Rhode Island this week! calendar says spring but I think thats a misprint

  3. #83
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    Re: Won't idle when cold

    I feel compelled to say this isn't a job I would recommend doing until AFTER you've performed the tests (discussed earlier in this thread) and confirmed it has failed.........just saying . Tim

  4. #84
    Van Enthusiast joegri's Avatar
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    Re: Won't idle when cold

    o yeah I agree completely Tim. there still is much to learn before I go in and start tearing. the good thing is I'm not pressed to use the van much these days so I'm of the school slow and steady wins the race

  5. #85
    Forum Newbie isaiah44's Avatar
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    Re: Possible thermostat issues.

    Quote Originally Posted by timsrv View Post
    If the van warms-up and the heater blows hot air, then it's not related to the thermostat. It could be a failed air valve (between the intake manifold halves). When the coolant is cold, the air valve allows air flow (increases idle speed). When the coolant is hot, the air valve closes and prevents air flow (slower speed). To test, warm the van, then pinch an air tube going to or from the air valve. If the idle speed goes down, then you have a failed air valve. Tim
    Hey Tim,

    Is there some trick to testing (or getting to a hose to pinch)? I pulled an idle air control valve off a junked van and brought it to my mechanic with the FSM, but he insists there isn't a way to access any attached hoses to pinch to find out if the one already in my van is faulty. Instead, he says he somehow tested the ohms on it and decided it was functioning properly. Is that possible? I don't know what else would cause my idle to increase as the van warms up. Unfortunately, neither does he.... Any thoughts?
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    Administrator timsrv's Avatar
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    Re: Possible thermostat issues.

    Quote Originally Posted by isaiah44 View Post
    Hey Tim,

    Is there some trick to testing (or getting to a hose to pinch)? I pulled an idle air control valve off a junked van and brought it to my mechanic with the FSM, but he insists there isn't a way to access any attached hoses to pinch to find out if the one already in my van is faulty. Instead, he says he somehow tested the ohms on it and decided it was functioning properly. Is that possible? I don't know what else would cause my idle to increase as the van warms up. Unfortunately, neither does he.... Any thoughts?
    Please refer to post #48 in this thread.

  7. #87
    Forum Newbie isaiah44's Avatar
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    Re: Possible thermostat issues.

    Quote Originally Posted by timsrv View Post
    Please refer to post #16 in this thread.
    Thanks. Has anyone had this issue with their van - idle continues to rise as the engine heats up and doesn't ever return to normal - and had it be due to something other than a faulty idle air control valve? My 87 won't pass smog bc the idle won't stay in an acceptable range and my mechanic says it's not the IACV, but doesn't have any other suggestions. Up against a wall here, any help would be greatly appreciate. Thanks!
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    Idle Air Control Valve and passing Smog Check

    Hi all,

    We are in process of getting our van registered in sunny California (originally from Manitoba, Canada) and we are being failed on our smog check because we had built our own replacement for the IACV when it failed years ago. The smog parts locator wants $180 for a "reconditioned" IACV, which seems ridiculous. The part number is 22230-73010.

    We were wondering if anyone has a line on a 85 (or compatible) valve somewhere in the Bay Area or has an extra we could purchase.

    Thanks!
    Erik and Helena

  9. #89
    Van Addict trestlehed's Avatar
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    Re: Idle Air Control Valve and passing Smog Check

    Supposedly this part is NLA from Toyota.

    Sometimes they pop-up on eBay. Otherwise might be a junkyard quest item.

    < The smog parts locator wants $180 for a "reconditioned" IACV, which seems ridiculous.>
    This might actually be a good deal if your van is your only vehicle and needs to be fixed asap.

    Read this thread (if you haven't already):
    https://www.toyotavantech.com/forum/...ight=air+valve

    Good luck!
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  10. #90
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    Re: Idle Air Control Valve and passing Smog Check

    Quote Originally Posted by erik View Post
    Hi all,

    We are in process of getting our van registered in sunny California (originally from Manitoba, Canada) and we are being failed on our smog check because we had built our own replacement for the IACV when it failed years ago. The smog parts locator wants $180 for a "reconditioned" IACV, which seems ridiculous. The part number is 22230-73010.

    We were wondering if anyone has a line on a 85 (or compatible) valve somewhere in the Bay Area or has an extra we could purchase.

    Thanks!
    Erik and Helena
    Wow, These parts are pretty much extinct in the sense the IAC for the van is unique in that it is not shared with any other vehicle and so your best bet is scour the salvage yards assuming you can find any vans as they are now as rare as a hens tooth. Maybe eBay, although I just searched and found nothing. I would say if they sourced one for $180 grab it as its probably one the few left in the world because that is still less than what Toyota would charge if it was still available from Toyota.

    Is the van idling high? if not, I am guessing it failed the visual inspection of the emissions test as a "missing component" and not that the Van was actually putting out higher emissions as a result of having a modified IAC? As long as you can set the idle at 850 or below that should be acceptable for passing emissions.

  11. #91
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    Re: Idle Air Control Valve and passing Smog Check

    Hi all,

    Thanks for the replies. Yes, we are well within the emissions output limits (better than average!) and are failing due to "modified emissions control components". To be honest, I think that the whole visual check thing is a bit ridiculous, if I'm not polluting what should it matter what parts I'm using.

    Anyhow, after some calling around I found an 86 at a junkyard near my work. Does anyone have instructions for how to get to the IACV? It's been years since I removed the original one from our van and I didn't put my replacement back in the same spot. I seem to recall needing to remove the intake?

    Thanks,
    Erik

  12. #92
    Van Addict trestlehed's Avatar
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    Re: Idle Air Control Valve and passing Smog Check

    Quote Originally Posted by erik View Post
    Does anyone have instructions for how to get to the IACV? It's been years since I removed the original one from our van and I didn't put my replacement back in the same spot. I seem to recall needing to remove the intake?

    Thanks,
    Erik
    Again, read this thread. The reason I linked to it is because it has pics and advice on how to remove it.

    https://www.toyotavantech.com/forum/...ight=air+valve
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  13. #93
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    Re: Won't idle when cold

    Looks like my air valve is not working. Did the hose test and the idle goes down when I pinch it off with pliers when hot. Looking at the picture that Tim supplied from the manual and knowing I really don't want to pull the intake manifold off again and I don't want to spend that kind of money I may have figured a way to solve the issue.

    Since the air valve is stuck in its open state with or without the power connector on it means that it is functioning as if the engine is warm all the time. So wouldn't it be easier to add an additional air valve in series with the original by way of an external valve control? The only difference would be that it would move to both states very fast rather than opening the door gradualy inside the original by way of the heater.
    To trigger it would be very easy. It calls for a certain time before it closes for warm running conditions. I am not sure what that is but I can find out for sure. Then we us a small micro controller as a timer using the same power connector the old one used.

    Anyone see any holes in this solution? If this works we would all have a solution for it.

    Here is one valve I looked at.

    https://shop.advanceautoparts.com/p/...982%7CL3*15307

    I also spotted another valve in the engine I could not identify. I have attach a photo. It sits just to the right of the partition between the engine and the air cleaner. In the pic you can see it is just south of the clamp screw that holds the big intake hose.

    Anyone know what this is for? Squeezing one hose changes the idle so it must have something to do with that.


    Thanks

    MT
    Attached Images Attached Images  

  14. #94
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    Re: Won't idle when cold

    Looks like ISC VSV - IDLE Speed Controller. Excellent Thread titled 'What Does a particular VSV do?' listed as thread 1582. This thread has diagrams and several pages of discussion.

    Cheers

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    Re: Won't idle when cold / auxiliary air valve / idle air control valve

    I know it's a long shot... But does anybody have an extra auxiliary air valve sitting around (22230-73011) they'd like to sell me for a good cause?! 😁

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