| Author | Topic |
|---|
Location:
Sydney
Registered:
July 2002
|
 Idle Air Control valve
|
Thu, 25 September 2003 03:08
|
 |
I'm playing with my IAC at the moment on the 1uz. We've kinda worked out how it works, but we can't get it wired into the Delco computer anyway so we're not going to try too hard.
The 1uz IAC has 6 wires and 4 coils. The holden ones have 4 wires and 2 coils (one in, one out).
My question:
Is there another toyota IAC that has the same setup as the holden IAC motor that is the same physical SIZE as the 1uz one?
I want to know before machining the housings of both to accomodate a holden one (like I did with the holden knock sensor).
I know Mos has some experience here, and other people might have too.
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: Idle Air Control valve
|
Thu, 25 September 2003 10:22
|
|
All the toyota ones i have seen are 6 wire you could try pairing the coils but check how much current draw there is first
With the pairing you will have coils A B C D and you will have to pair them in the correct "firing order" IE A + C and B + D or the motor will not turn (may have to open one up and track the windings inside)
the other thing will be the amount of turns compared to a holden one may require modifying the seat/needle to obtain a number of turns to keep the delco ecu happy
Have fun!
Allan
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Thu, 25 September 2003 23:42
|
|
Bugger it, I've had enough of electrical patches, I'll just machine the casings of both of them and make one that houses the holden one.
Know of a good way to bond two small peices of aluminium? Might have to talk to my metal worker shop about welding it up for me (can you weld aluminium?)
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 04:40
|
|
|
A friend of mine is going to try and adapt a knight rider scanning lcd kit to trigger the 4 coils on the standard toyota one from two coils - forward and back. Would be very interesting if he can do it.
|
|
|
Location:
ACT
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 04:51
|
|
Pete,
That won't work, The kit doesn't have any inputs for you to control the outputs. The outputs also have to be able to drive the coils, the kit can't do this.
I will be making an idle speed control for my 1uz to be controlled by my autronic. The autronic uses PWM to drive the idle air so I need to convert this to stepper type (not very difficult).
What sort of output does the delco do to control the idle air? I can probably make something for you.
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 05:05
|
|
Ahh Kdog, was going to ask you about this, but you found me instead 
(From what I know)
Its a 2 coil (4 wire) system. One in, one out. If the in is held on it will keep going in (very fast). and vice-versa. The computer sends small pulses to it to vary the idle speed.
My mate will also be interested in it (David White).
How close are you to making it work?
|
|
|
Location:
ACT
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 05:31
|
|
Ok found some delco wiring diagrams.
The motor is a bipolar drive, so I need to convert it into a unipolar steeper motor (Toyota type).
Actually from memory you may be able to convert the toyo one to work straight onto the delco. You can convert unipolars into bipolars by ignoring the power wires. It may be worth a try.
I don't have a wiring diagram in front of me but from memory the wires for the toyo IAC are as follows;
Power for motor is Black/red should be two of these going into IAC, leave them disconnected.
OK for delco coil A high we will connect the toyo IAC yellow wire.
for delco coil A low we will connect the toyo IAC yellow/green wire.
OK for delco coil B high we will connect the toyo IAC yellow/red
OK for delco coil B low we will connect the toyo IAC yellow/blue.
I think this is right, give it a try and let me know how it goes.
Cheers
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 05:38
|
|
I don't say this to many guys, but I love you.
I'll test it as soon as I can.
Thanks Kdog.
|
|
|
Location:
ACT
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 05:47
|
|
Ohh yeah just twist and tape the wires together because you may need to reverse some of them to get it rotating properly.
If you get some movement out of it then we are on the right track.
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 05:55
|
|
|
Its not on the car now, so I'll first test off the engine. Then will tape it in and sit it ontop of the engine and test it there, if it works then I'll put it onto the intake manifold again.
|
|
|
Registered:
March 2003
|
|
Re: Idle Air Control valve
|
Fri, 26 September 2003 08:09
|
|
|
Is this the same as the 1JZ or similar?
|
|
|
Location:
Madrid - Spain
Registered:
August 2002
|
|
Re: Idle Air Control valve
|
Tue, 30 September 2003 23:19
|
|
Sounds like you don't need to know this now, but only some alloys of aluminium can be welded. any 6000 series can be welded. This is most likely what you will be using.
Bonding aluminium can give you good results. Scuff and degrease the fay surfaces and bond with an epoxy type adhesive. It is a surface bond so it is very important that the surfaces are very clean and properly degreased. If you want a really good bond, anodising or pickling the surface improves the bond strength.
|
|
|
Registered:
June 2002
|
|
Re: Idle Air Control valve
|
Tue, 30 September 2003 23:43
|
|
|
HKS pete if K dog has no luck. Have you considered going to a GM throttle body? either VN V6 or VN V8. I imagine and adapter plate would be easier than trying to adapt a IAC valve. But it will also depend on your throttle linkages I guess. If you need one let me know I have a VN V8 one here brand new with all the sensors going very cheap.
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: Idle Air Control valve
|
Wed, 01 October 2003 01:50
|
|
Roger, thats a good idea actually. I'll see how I go with the electrical method, then start looking at mechanical.
Anthony, thanks, that will come in handy if I'm doing some other work (or if the electrical stuff doesn't work). would you believe that the piece of aluminium that attaches the IAC to the manifold is actually O-ringed? talk about over-engineering 
|
|
|
Location:
Madrid - Spain
Registered:
August 2002
|
|
Re: Idle Air Control valve
|
Wed, 01 October 2003 03:10
|
|
|
The O ring sounds right. Either that or you would need expensive surface finishing and fastener torqueing to ensure an airtight fit. It is only low pressure so an O ring is a much cheaper option than smoothing the IAC flange and installing a gasket.
|
|
|
