04-24-2018, 06:30 PM
Hi Dave, big learning curve by the sound of it, however you have made the journey into the forest, the way out should be easyer.
Q1; was the iacv disconnected when you removed it? picking it was connected.
q2; now that they are both out is there a difference in binding the threaded part i.o.w. does the old one run freely?
a1; position of the piston inside; it has worked fine before all the trouble started so unless the ecm has slowly dribbled out of position ( stuck during part of the travel and still counted the same amount of steps ) i expect it to be correct.
"There is something potentially wrong with the way the valve came out though. I expected the valve to have been positioned all the way to its "as-installed" location, which is the valve rotated clockwise the full length of its travel on the threaded shaft, (this is how the FSM instructs you to install the valve) but instead, it was about 1/3 of what I "estimate" to be its full travel in the opposite direction."
As far as i can work it out it chases a moving setpoint depending on air and engine temperatures so it should have a tendency to "shuffle"along the working part of the cylinder and resets to a pre- determined position every time the engine is started from cold.
In other words it automatically finds it's own spot.
The concern i had was if the piston was initially mounted too far into the barrel ( not wound back ) and the thread was compressed against the end of the barrel where it has a minimal amount of threads on initialisation.
I think the real answer is that you would need an obd2 tool to tell exactly where the piston is at any time, however we know that it is not in the target position if the engine idles badly, so you can reliably guess when it is too far open or closed.
( if you can see the shadow of a tree you know the tree is there otherwise what makes the shadow?)
a 2; if the iacv was connected and the bike idled ok prior to being switched off the iacv was indeed in the correct operating position for a warmed up engine, well done Dave.
Could it be that the valve was on an angle in the barrel? ( Minor scuff marks at the very end of the tip of the piston )
Can we have a look at pictures of both iacv's prior to mounting the new one?
Q1; was the iacv disconnected when you removed it? picking it was connected.
q2; now that they are both out is there a difference in binding the threaded part i.o.w. does the old one run freely?
a1; position of the piston inside; it has worked fine before all the trouble started so unless the ecm has slowly dribbled out of position ( stuck during part of the travel and still counted the same amount of steps ) i expect it to be correct.
"There is something potentially wrong with the way the valve came out though. I expected the valve to have been positioned all the way to its "as-installed" location, which is the valve rotated clockwise the full length of its travel on the threaded shaft, (this is how the FSM instructs you to install the valve) but instead, it was about 1/3 of what I "estimate" to be its full travel in the opposite direction."
As far as i can work it out it chases a moving setpoint depending on air and engine temperatures so it should have a tendency to "shuffle"along the working part of the cylinder and resets to a pre- determined position every time the engine is started from cold.
In other words it automatically finds it's own spot.
The concern i had was if the piston was initially mounted too far into the barrel ( not wound back ) and the thread was compressed against the end of the barrel where it has a minimal amount of threads on initialisation.
I think the real answer is that you would need an obd2 tool to tell exactly where the piston is at any time, however we know that it is not in the target position if the engine idles badly, so you can reliably guess when it is too far open or closed.
( if you can see the shadow of a tree you know the tree is there otherwise what makes the shadow?)
a 2; if the iacv was connected and the bike idled ok prior to being switched off the iacv was indeed in the correct operating position for a warmed up engine, well done Dave.
Could it be that the valve was on an angle in the barrel? ( Minor scuff marks at the very end of the tip of the piston )
Can we have a look at pictures of both iacv's prior to mounting the new one?