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

  1. #61
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    Re: Won't idle when cold

    Quote Originally Posted by timsrv View Post
    FWIW, i thought these were 14mm, but didn't have one handy to measure. Tim
    Oops! I mentioned the standard to metric difference in a different thread where this topic was recently discussed but incorrectly said they were 12mm. My only issue with the stretch fit was out of concern that they may split as they dry out and shrink from the heat. Of course I had alternate options at the dealer several years ago when I did my HG. I suppose it's a moo point now.

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    Re: Won't idle when cold

    Oh man, thanks Hammervan! I was about to just put the OEM's back on and try my luck. They were in decent shape but definitely older. I just ordered 3 sections of the Dayco 80393 hose that you linked to replace the 3 sections with the sharp bends.

    BTW im in SLC too, so I'm going to hunt you down for taking my aux air valve

  3. #63
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    Re: Won't idle when cold

    Oh man, when my aux air valve suddenly disappears from my van, I'll know who took it, mistershmi! I'll keep my eyes peeled for your van, I see a few still running around Salt Lake but they all seem to be 2WD. Glad the hose info was helpful.
    Of course, now that I've replaced the hoses on the aux. air valve, including the 8 mm coolant hose, I've now noticed Tim's mention in another thread that it's best to use the original Toyota spring clamps and genuine Toyota hose for the coolant line. I used the same 5/16 fuel line hose and regular hose clamps like I did on my Hose of Death. Not sure if it's worth putting the original hose back on before I put it all together...
    Last edited by Hammervan; 06-21-2017 at 03:27 PM.

  4. #64
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    Re: Won't idle when cold

    Quote Originally Posted by timsrv View Post
    This guy on eBay still has 2 left http://www.ebay.com/itm/Fuel-Injecti...JZJcHF&vxp=mtr, but I just can't bring myself to pay $285 for one. Tim
    Just a heads up. I just tried to buy one of these with some expendable cash I had, to save myself tracking one down later if the part ever fails on my van, and they had to refund my money. They don't actually have them in stock and had to go to the dealer where they learned they were NLA. Said he would be removing the auction listing.

  5. #65
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    Re: Won't idle when cold

    Back when I used to sell there eBay required sellers to have physical possession of items before listing them. I guess that must have changed. I've purchased things from eBay before only to receive things drop-shipped from other locations. Next time I needed them I went right to the company who drop shipped and saved some money. I guess there's nothing wrong with sellers doing that as long as item arrives in a timely manner........just seems a bit fishy though. Glad you got your money back. Tim

    PS: Funny how van parts just disappear from existence without warning. With the prices Toyota was asking I figured they'd be around for a long time. Tim

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    Looking for IAC valve connector for 85 van?

    This is one of those stupid things you swear you can find, but then you get stuck on something. My mechanic has been doing quite a bit of work on my engine. Recently did a head gasket repair and when put back together realized engine was running rough. Since engine hasn't run in quite some time, he concluded that he thinks the problem is the fuel injectors, but upon working on them, all the injector connectors were deteriorating. Also he said the cold start injector connector and the IAC valve connector were deteriorated, and we have found pretty much every connector except for the IAC valve. Would any of you happen to know where I can find one? I've looked around Rockauto.com which has a pretty good selection of parts, but alas, no IAC valve connector. Or would anyone happen to know if these connectors were used on other Toyotas and/or different years and models? Even if someone has a picture of this thing, that would be very helpful. After this thing is done being worked on, I'm going to sell it, so stay on the lookout for a upcoming posting for an 1985 Toyota van that's had a ton of work done to it. Thanks for reading, all, and good luck.

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    Re: Looking for IAC valve connector for 85 van?

    My mechanic also just sent me these pictures. This is what we're working with.

    Name:  iac connector 1.jpg
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    Name:  iac connector 2.jpg
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    Name:  iac connector 3.jpg
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  8. #68
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    Re: Looking for IAC valve connector for 85 van?

    I had that same issue, and ended up replacing this and all the connectors under the hood.

    For a lot of them and I believe this one you are after is included you can use this connector available from Parts Geek: http://www.partsgeek.com/catalog/198...connector.html

    They also stock them at O'Reilly Auto Parts, but I'm not at the shop where I have the part number handy.

    If you look closely at the enlarged view of the photo, you'll see there is a notch in the plastic connector. For the coolant sensor it is in the center. For some of the other things that use it, like the IAC, the notch may be in a different spot. Since this was the only connector available that I could find and that was the only difference, I just made my own notch where needed to make it work. Hope that helps.

    --

    And if you need it, here is the TPS connector, which is a little different. http://www.partsgeek.com/catalog/198...connector.html

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    Re: Air Valve Test

    Hi all.

    Newish '86 van owner and currently idling very rough upon starting (needs foot on gas or will sputter and stall). After warming up, about 3-5 minutes, things tend to smooth out. Recently had the fuel pump - which had died - replaced and my mechanic friend suggested replacing the air valve to assist with the early start idling issues. I'm looking for the part but haven't had much luck. Any suggestions on where to purchase an "air valve" as diagrammed above? Is "air valve" even the right name for the part?

    Thanks! This forum has been a blast to read and refer...

  10. #70
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    Re: Air Valve Test

    I would look for vacuum leaks.

    The air valve only provides high idle during warm up.

    Mine never worked. And my van idles smooth.

    Also try jumpering the fuel pump and see if that improves any thing. Not enough air flowing through the maf will make the fuel safety switch flicker. I have to step on the gas peddle a little to start my van. I little more air helps turn on the fuel pump.

    Also check timing and fuel pressure.

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    Re: Air Valve Test

    Thanks for the response. My next move is to replace the fuel pressure regulator and check the timing.

  12. #72
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    Re: Air Valve Test

    I recently got the last new air valve in existence off ebay (as chronicled here http://www.toyotavantech.com/forum/s...air+valve+ebay) and it made a huge difference in how my van idles when cold. I don't need to depress the gas when starting and keep it there until warmed up. It's an easy part to test and see if it's the culprit. I wonder if the air valve off another Toyota would fit, the ones I see at the junk yard look very similar, it would just have to fit in the small space between the manifolds unless you relocated it.

  13. #73
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    Re: ISC Valve

    Quote Originally Posted by timsrv View Post
    As far as ECUs go, ours are some of the earliest (and most primitive) ones out there. When it comes to control systems it's all about input vs output. I don't think ours are sophisticated enough to detect electrical loads (but I could be wrong). I'm not sure what year range that article is referring too, but some of the standard functions in today's ECUs weren't even thought of back when ours were built. Tim
    I'm sure that this has all been learned since 2012, but, just in case this is new information ... here it is --

    there are 4 types of isc vsv's listed here... the 4th one seems to be for the "on-off" control VSV that it says is for the 4Y-E engines...

    apparently, among other things, there is an "Electrical load idle- up" mode


    isc vsv.PDF

    page 10 on the pdf
    Last edited by Tan Van; 11-22-2017 at 09:51 PM. Reason: add ifo

  14. #74
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    Re: ISC Valve TOYOTA... MAKE UP YOUR MIND !!!

    There are 2 ways that the ISC VSV is shown to be plumbed...

    the diagram we're all familiar with is as follows ...Name:  Vacuumzz.jpg
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    here, the rear port goes to the throttle body

    Now, for the other way...Name:  IMG_7152zz.JPG
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    here, my vacuum sticker ('87 2wd/auto/) clearly shows that the FRONT port goes to the throttle body---

    if I'm not mistaken, this is a "one-way" valve, so, hooking it up backwards could be an issue...

    for what it's worth, this valve's solenoid clearly clicks when my van is warmed up and i rev the throttle ...and my vacuum gauge shows "closed initially" , and, "open after solenoid click" (this is with the vacuum gauge hooked up to the rear/inboard port which leads to the big intake hose) ...
    so..., obviously since the valve is receiving a constant vacuum pull at the hose from the throttle-body, I plumbed it as my sticker shows (on the front/outboard port)---

    (I don't think it can go either direction like a BVSV)

    I just want to know what's the right setup

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    Re: ISC Valve

    okay... sorry if I wasted anyone's time... I just applied 12 volts to the ISC VSV and blew through the ports, and, it turns out that air flows in either direction when it's open, so, both diagrams for hose routing will work fine. On another note, I also find that, with the van warmed up and idling, turning on the lights has no effect on idle and does not open the VSV... So, it doesn't seem to be an "electrical load idle-up" feature...(I expected the electrical load to activate the valve and see an increase in idle speed similar to when you turn the steering wheel when parked at idle and the RPM's rise a little from the power-steering idle-up feature). However, when starting an already warmed up van and idling, the valve is initially closed, but, when I rev the throttle a couple times- the solenoid clicks and stays open (even when the engine returns to idle). So, I'm glad it works but I still kind of have no idea why it's there.

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    Re: Possible thermostat issues.

    Quote Originally Posted by timsrv View Post
    PS: Yes, it's Toyota part #22230-73011. They are spendy and a PITA to replace (unless you already have the intake apart). I've never actually had to replace one with new (was always able to find a good used one when needed). I see there's one listed on eBay: http://www.ebay.com/itm/Fuel-Injecti...JZJcHF&vxp=mtr. You used to be able to get aftermarket ones off rockauto until just a year or so ago, but it appears now they are gone. Even those were expensive........just not as bad as OE.

    The symptom of a bad one is having correct idle speed when cold but high idle when hot (if it's stuck open) -OR- having a low idle speed when cold, but a correct idle speed when hot (if it's stuck closed).
    Hi Tim,

    Is there a thread detailing the least painful way of removing/installing an idle air control valve? Mine is bad and I'm going to try to get one off a parts van this afternoon. Any help would be greatly appreciate.

    Thanks!

  17. #77
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    Re: Won't idle when cold

    Sorry, no magic bullet here. That valve is actually bolted to the underside of the top half of the intake, so it has to come off before you can remove the air valve. Here it is in all it's glory:


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    Re: Won't idle when cold

    Quote Originally Posted by timsrv View Post
    Sorry, no magic bullet here. That valve is actually bolted to the underside of the top half of the intake, so it has to come off before you can remove the air valve. Here it is in all it's glory:

    Thanks Tim,

    The only description in the FSM that discusses access to this area is for a cylinder head removal, which includes opening the full engine compartment, draining the oil and coolant, and removing the exhaust pipe, throttle body, power steering pump, etc. Do you recall if all of that is necessary to access the idle air control valve?

    Also, I found this while searching the web for the NLA part:

    https://www.rockauto.com/en/catalog/...ac)+valve,6072

    The part numbers don't match, but it says it's compatible with our vans. And it's cheap! Probably too cheap. There's only one left. Thoughts?

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    Re: Won't idle when cold

    That's not the air valve. There's a discrepancy regarding the aftermarket part manufacturers terminology vs Toyota's. We call that part the AC Idle-up Diaphragm. To find out more about it CLICK HERE and scroll down to the middle of the page.

    You don't need to remove the cylinder head to remove the air valve. You just need to remove the top half of the intake manifold. Of course that's not quite as easy as it might sound. There's a lot of other little things that need to be removed before you can do that. You might want to read the Hose of Death thread and cut an access hole in the back of the engine hump (as shown there). Having that access hole is an enormous help when removing the metal pipes from the back of the upper intake. Search the site for for more information on the other steps. Threads that discuss head gasket jobs should mention steps for removal of the upper intake. The information is here, the trick is finding it. If you're not having luck with the site search feature, use Google or other similar search engine (as talked about HERE). Tim

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    Re: Won't idle when cold

    Quote Originally Posted by timsrv View Post
    That's not the air valve. There's a discrepancy regarding the aftermarket part manufacturers terminology vs Toyota's. We call that part the AC Idle-up Diaphragm. To find out more about it CLICK HERE and scroll down to the middle of the page.

    You don't need to remove the cylinder head to remove the air valve. You just need to remove the top half of the intake manifold. Of course that's not quite as easy as it might sound. There's a lot of other little things that need to be removed before you can do that. You might want to read the Hose of Death thread and cut an access hole in the back of the engine hump (as shown there). Having that access hole is an enormous help when removing the metal pipes from the back of the upper intake. Search the site for for more information on the other steps. Threads that discuss head gasket jobs should mention steps for removal of the upper intake. The information is here, the trick is finding it. If you're not having luck with the site search feature, use Google or other similar search engine (as talked about HERE). Tim
    Great, thanks Tim! I really appreciate the help!

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