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

  1. #101
    Forum Newbie
    My Van(s):
    1991 Toyota Previa 1985 Toyota Van
    Join Date
    Nov 2020
    Rep Power

    Re: Air Valve Test

    Quote Originally Posted by llamavan View Post
    When you start the van, does it run rough and want to die (or actually die if not given gas)?

    Hello, and thank you van gurus for this incredibly helpful thread. Iíve had ongoing cold start issues since I resurrected by 85 Van last year. Iíve narrowed it down to everything but this air valve. Cold start time switch is good (was replaced along with the Bosch connector), cold start injector passed ohm test and is confirmed to be working, I cleaned my throttle body when I did the TPS, I replaced all vacuum lines and verified there are no leaks, I even tried a spare ECU since I had one from the junkyard.

    And still, when cold starting I got to put my foot on the throttle a little to get it to start. Otherwise, itís exactly like Gwen describes here, Iíll hear it fire up but promptly die. I followed the on-vehicle check outlined on page FI-57 (that was quite a stretch with the longest pair of pliers I had) and it failed. No change in RPM.

    So last night I pulled my intake and got the air valve out, and unfortunately it looks good, as illustrated in the repair manual??? Looks just like my other one, open just slightly at room temperature. Ohms are the same on both too, at 44.

    Iím wondering if anyone knows a little more specifics about how these work. Like whatís the 7mm adjustment screw do? Does the heat coil change with coolant temp and then move the gate valve accordingly? If so then what is the actual electrical connector for? Or does it run off the ecu temp switch (which I have also replaced)? Lastly has anyone experimented with rebuilding these using parts from other Toyota air valves? I looked around online and it seems like other models had air valves just with different shapes.

    Iím taking my fuel injectors to be cleaned and tested and Iím waiting on an intake gasket from rockauto, so I have a little while to figure out what Iím going to do. I would hate to put my new/old air valve in and have the same problem. Any input would be greatly appreciated, this forum has been a lifesaver.
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