where is the IAC valve???
02-07-2009, 08:29 PM
#1
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where is the IAC valve???
I have a 89 toyota pick up with a V6 3vze and cannot locate my Intake Air Control Valve. Are there any alternative names for this valve? I've looked up many resources online and went through all my manuals to no avail. Can somebody post/reply with a pic/site/schematics....anything would be a big help. thanks.
02-08-2009, 01:21 AM
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Is it really an IAC valve (electronically controlled by the ECU) or is it simply heat activated for cold idle purposes? (more like a choke only) I would like to know for sure.
02-08-2009, 04:48 PM
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It is under the throttle body, has two coolant lines: one from the engine and another to return coolant as well as air passages, built into the mounting.
It operates much like the Auxillary Air Valve, or Air Bypass Valve, from Bosch K/J Jetronic injection systems where it has two ports connected, one fore and one aft, of the throttle plates and is temperature controlled. Where the Bosch systems used electric signals to heat the valve and cause it to close as the engine warmed up, the Toyota system is heated by coolant flow. Arguably more accurate, or at least more representative of the engine temperature.
What was the question again?
It operates much like the Auxillary Air Valve, or Air Bypass Valve, from Bosch K/J Jetronic injection systems where it has two ports connected, one fore and one aft, of the throttle plates and is temperature controlled. Where the Bosch systems used electric signals to heat the valve and cause it to close as the engine warmed up, the Toyota system is heated by coolant flow. Arguably more accurate, or at least more representative of the engine temperature.
What was the question again?
Last edited by abecedarian; 02-08-2009 at 04:50 PM.
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02-08-2009, 05:14 PM
#8
I think its a good system- you hardly ever hear about the valve failing on Toyotas and as Abe pointed out, coolant temp is pretty damn representative of engine temp. I just replaced a Idle Air Control on a Ford Ranger with about 100K. I spoke with the junk yard guy and he said that IAC fails on tonnes of Fords. Ford uses an electric solenoid instead of the mechanical system used my Toyota. The Ford usually gums up, or the solenoid dies in pretty short order.
02-08-2009, 05:25 PM
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The Ford IAC valve is not the same as on a Toyota. The Ford IAC is computer controlled & changes idle speed whenever it needs to be adjusted. The Toyota valve is only for cold start up. Totally different all together. It seems to more along the lines of a choke for cold start up only. The Ford IAC actually controls the Idle where as the Toyota relies on the bleed screw sorta like a carburetor. They both get the job done but are not the same at all.
03-21-2012, 05:53 AM
#11
2443 = Secondary Air Injection System Switching Valve Stuck Closed
Secondary Air Injection is an emissions system. It's not related to this thread in any way. And if you have any further questions about it, you should post them in the 99+ Tundra, 00+ Sequoia, 98+ Land Cruiser/LX470 Forum
Side note: OBDII Idle Air Control System codes are 0505-0509
Secondary Air Injection is an emissions system. It's not related to this thread in any way. And if you have any further questions about it, you should post them in the 99+ Tundra, 00+ Sequoia, 98+ Land Cruiser/LX470 Forum
Side note: OBDII Idle Air Control System codes are 0505-0509
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