Hi guys, I'm heading towards the completion of the rebuild of my burned VROD and am now up to sorting out some of the minor issues of components that were effected by the heat of the fire...such as the IAC.
I've posted some text across (see below) from the Technical Section as the nature of the problem has changed.
Idle Air Control Motor.
I started the engine tonight and wedged some cotton cloth in the well between the butterflys of the throttle body where the bleed port for IACM is situated. By restricting the flow of air in this manner I was about to get a really nice idle speed and the engine would still rev cleanly.
Given this I'd say the IACM is cactus!
The large pintle that controls air flow at idle seems to be fully retracted allowing the port to draw a maximum amount of air.
There are 4 pins on the IACM... how do I check it for operation on the bench? The ECM has 4 pins all designated IACM...this doesn't tell me much?
*I have an old 6 volt motorcycle battery that registers less than 6volts that I could use as a power source.
Bob's Response
In the manual on the IAC, it states there should be a "park" procedure every time the key is turned off after being on more than 2 seconds. The pintle should first fully extend, then fully retract to prepare for the next start, it takes 10 seconds to cycle. Try this once and see what happens. I can't find a voltage correlation to test the IAC on a bench, it shows the wires, 2 "high" and 2 "low". I was half expecting the bike to die when you blocked the airflow if the IAC was the problem, I'm wondering if there's a vacuum leak-maybe a rubber part melted.
My response
Bob, I'm at work so I'm rushing this response. I tried a ground and 4.5 volts on all pins of the IAC motor and nothing happens. I reckon the IAC is 'stuffed' to use an Aussie term. The pintle is fully retracted and so a maximum amount of air is entering the idle port. (I could always cobble up a (mechanical) needle valve adjustment if I'm desperate...although the computer would definitely be out of the loop. Even restricting it in the way I did, its possible to get a really nice even idle)
Guys please chime in here if you have any specific knowledge about testing the function of the IAC motor
I've posted some text across (see below) from the Technical Section as the nature of the problem has changed.
Idle Air Control Motor.
I started the engine tonight and wedged some cotton cloth in the well between the butterflys of the throttle body where the bleed port for IACM is situated. By restricting the flow of air in this manner I was about to get a really nice idle speed and the engine would still rev cleanly.
Given this I'd say the IACM is cactus!
The large pintle that controls air flow at idle seems to be fully retracted allowing the port to draw a maximum amount of air.
There are 4 pins on the IACM... how do I check it for operation on the bench? The ECM has 4 pins all designated IACM...this doesn't tell me much?
*I have an old 6 volt motorcycle battery that registers less than 6volts that I could use as a power source.
Bob's Response
In the manual on the IAC, it states there should be a "park" procedure every time the key is turned off after being on more than 2 seconds. The pintle should first fully extend, then fully retract to prepare for the next start, it takes 10 seconds to cycle. Try this once and see what happens. I can't find a voltage correlation to test the IAC on a bench, it shows the wires, 2 "high" and 2 "low". I was half expecting the bike to die when you blocked the airflow if the IAC was the problem, I'm wondering if there's a vacuum leak-maybe a rubber part melted.
My response
Bob, I'm at work so I'm rushing this response. I tried a ground and 4.5 volts on all pins of the IAC motor and nothing happens. I reckon the IAC is 'stuffed' to use an Aussie term. The pintle is fully retracted and so a maximum amount of air is entering the idle port. (I could always cobble up a (mechanical) needle valve adjustment if I'm desperate...although the computer would definitely be out of the loop. Even restricting it in the way I did, its possible to get a really nice even idle)
Guys please chime in here if you have any specific knowledge about testing the function of the IAC motor
