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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-22-2011, 12:28 PM   #1
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Disable Auxiliary Air Valve?

Is it possible to disable or work around the auxiliary air valve? I believe that is what is causing my idle surging, and I don't have the time or space to try taking it off and cleaning it. Its to cold out to work and my garage isn't heated.

So is it possible to just run a coolant line around the AAV and just disable it, will that work?

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1990 Toyota pickup, Regular cab Short bed, 22RE 5speed manual 4x4, 203,000 miles

1990 GMC 2500 Camper Special, 6.2L Diesel 3spd Auto. 188,000 miles

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Old 01-23-2011, 02:16 AM   #2
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You can bypass the IAC valve on the throttle body, just remove the coolant hoses and hook them together. If you still have the same problem after you do that, then the problem is some were else.
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Old 01-23-2011, 07:20 AM   #3
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Alright that sounds like it could work, I'll give it a try and post if it works or not
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Old 01-23-2011, 07:49 AM   #4
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Air pockets in the coolant will cause the idle to surge and 22RE's are known for it, which I'm sure you already know. I personally use an airlift, which works perfect because it pulls the system in a vacuum. I don't know if you've tried filling coolant with the usual spill free funnel and then just jacking up the front end, pretty much as high as it can go (put the e-brake on), and watch as all of the air pockets work themselves out.
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Old 01-23-2011, 08:01 AM   #5
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Quote:
Originally Posted by Lextech View Post
Air pockets in the coolant will cause the idle to surge and 22RE's are known for it, which I'm sure you already know. I personally use an airlift, which works perfect because it pulls the system in a vacuum. I don't know if you've tried filling coolant with the usual spill free funnel and then just jacking up the front end, pretty much as high as it can go (put the e-brake on), and watch as all of the air pockets work themselves out.
I've already tried this, I spent a lot of time trying to get all of the air bubbles out of the system. And it still has the surge
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Old 01-23-2011, 08:06 AM   #6
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hmmm... Have you tried jumping IDL and E2 on the TPS wire harness? That is the quickest and easiest test for eliminating that out of the scenario and it's quite common.
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Old 01-23-2011, 08:20 AM   #7
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What is the best way to jump those?
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Old 01-23-2011, 08:41 AM   #8
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The most ideal would be to have the same size wire ends as the TPS itself has, so that way they fit snug. Solder the cut wire ends together and then plug in the pins to the harness. You are just making a solid loop from IDL to E2. If I had my jumper wires at home I'd take a picture.
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Old 01-23-2011, 11:31 AM   #9
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I disabled my AAV by running a hose around the the valve and, this didn't fix my idle surge.
However I blocked the AAV port in my intake and that caused my idle problem to go away I set my idle screw and am going to have to drive it as is for a while.

Is there any way to clean the AAV while its on the TB? I really dont want to take it off right now
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Old 01-23-2011, 07:30 PM   #10
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Are there any Oil galleries next to water galleries in the intake manifold? So if my intake manifold gasket were bad I would get water in my oil?
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1990 GMC 2500 Camper Special, 6.2L Diesel 3spd Auto. 188,000 miles

1997 Pontiac Grand AM, Quad 4, 5spd, 239,000 miles - SOLD!
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Old 01-23-2011, 08:15 PM   #11
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No, there aren't any oil galleries there. A head gasket and/or the timing cover being worn through would cause water in your oil.
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Old 01-24-2011, 07:29 AM   #12
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I didn't think there were, I'll be doing head gasket and timing cover this spring.

At least I got the idle figured out, is there a way to clean the AAV while its on the truck?
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Old 01-24-2011, 07:50 AM   #13
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Not properly no. I have seen a lot of foreign matter stuck inside of those, such as silcone etc.
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Old 01-24-2011, 08:39 AM   #14
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Thats kinda what I figured. But hey at least I can drive it
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Old 01-24-2011, 10:20 PM   #15
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The reason your idle is surging is air leaking into your coolant system.
Look for a leak, usually white powdery looking traces where the leak is.
Get your engine up to operating temperature, pop the hood and look around, rev it a bit to see if anything is spraying coolant.
I've had a hose back off the fitting and a pin hole leak in one of the smaller hoses under the intake cause this exact same problem.
Hoses can dry out and crack. Rad can get a hole from a rock chip. Hoses are easily damaged when you take them off. A leaky gasket can leak and let air in.
The tell-tale chalk white traces are pretty easy to spot.
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Old 01-25-2011, 07:19 AM   #16
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I've already been through all the coolant hose checks before I came to yotatech for help. As far as I could tell no external leaks.

I do know its getting in to the oil, I had an oil report done by Blackstone Labs. They found trace amounts of coolant in the oil. But no froth on the oil cab yet
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Old 02-02-2011, 06:29 AM   #17
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How did you actually block off the AAC?
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Old 02-02-2011, 07:43 AM   #18
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This probably is not the best way to do it. But I cleaned all round the AAV hole with carb cleaner, once it was clean and dry I put duct tape over it. I check it everytime I drive it to make sure its not coming off, so far so good
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1997 Pontiac Grand AM, Quad 4, 5spd, 239,000 miles - SOLD!
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Old 02-02-2011, 08:00 AM   #19
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What are the symptoms of the idle surge? Like what conditions are needed to cause it?
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Old 02-02-2011, 09:04 AM   #20
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My idle?
It seems as soon as the thermostat opens it starts to surge. Thats whats leading me to think of the AAV. Because once it gets warm its supposed to close
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Old 02-02-2011, 09:04 AM
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