blowin' air

[forestdan7]

First post, so please bear with me.
Bought an '85 FJ60 a few weeks ago, drove it from CO to KY no problem. Ran great. 13-15 mpg.
When changing the oil, I noticed the front VTV (blue) was broken off right past the vacuum hose and hanging loose.
So I pulled it and glued it (I'm cheap), tested it, and put it back in.
When I fired the engine, I heard a lot of air hissing from somewhere.
Replaced a hose with a frayed end, but that didn't stop it.
Traced it to a hole, that looks like it's supposed to be there, in the side of the ABV (#5 on SOR page 048).
Connect the VTV, air blows out. Pull the VTV, air stops blowing after a few seconds.
Engine runs much better with the VTV disconnected.
Any ideas what's going on?
Can I leave the VTV off and cap the vac lines before and after it?
I'd love to completely desmog this thing (KY doesn't check), but if it's an easy fix, might as well keep it working for a while.
Thanks for any help

 

[2mbb]

The VTV and ABV are part of your Air Injection (AI) system. This system injects air into the exhaust gas so the catalytic converter can reduce polluting emissions. The emissions manual doesn't show any open bleed hole for the ABV, so I'm going to assume that you are missing a hose or that a hose connection has broken off. If you can get a picture that might help. The VTV works in conjuction with VSV 1 to control whether the air is injected into the exhaust or is bypassed back to the air cleaner. The VSV 1 is controlled by the thermo sensor, located in the catalytic converter. When the cat get too hot, the thermosensor closes VSV 1 and the air is bypassed to the air cleaner and not injected into the exhaust.

Check the schematics below to make sure everything is hooked up correctly. If you're going to keep the smog, I recommend you invest in the Toyota emissions manual, publication RM36043. This manual has procedures on operation and troubleshooting.

 

[forestdan7]

thanks for the help

Based on the schematics, it looks like the bleed hole I'm feeling air come out of is in the ACV, not the ABV like I thought based on the SOR drawings.
It looks like everything else is hooked up correctly.
I do have an exhaust leak I haven't addressed yet, so I wonder if that could cause the circuit not to function correctly.
I'm ordering a copy of the emissions manual and the wiring diagram right now.
Thanks again.

 

[2mbb]

Now that I look at the schematic more closely, I think the assembly is called the ACV (air control valve) and this assembly has two diaphragm acutated valves, the ABV and ASV. I thinks SOR refers to the ACV assembly as the ABV, as I do in my post above. If you disconnect VTV (1), then the ASV will cloase allowing air to divert (bypass) back to the air cleaner. If I'm reading the manual correctly, at idle, VSV (2) will be closed, which under proper operations (VTV (1) connected and VSV (1) open) will pump air into the exhaust ports. This is the condition shown in the schematic (1) above. If you have a leak when you connect VTV (1) at idle, then you may have a leak in a hose or at one of the fittings on the ACV, or perhaps your check valve at the exhaust air rail is frozen shut and air is leaking out where it shouldn't (where the hose clamps to the fitting). Good Luck.

 

[forestdan7]

Thanks for the description of what's going on with that AI circuit.
So I suppose with the VTV unplugged, air is bypassing because the ASV is closed. And it runs fine that way.
I'm going to pull off the check valve at the air rail and see if I can tell if it's frozen shut like you mention.
Everything at the ACV looks to be hooked up right and not leaking.
If I can't find it at the check valve, I think I'll just leave it alone till it runs bad or I move to a smog state.
I appreciate the help.