04-26-2018, 12:21 AM
Is the piston made of plastic or metal?
It is not magnetic. I think it's aluminum (it's real light weight), but it is shiny in appearance. It's possible that it's a hard plastic, and I will have a closer look at this and get back with a better answer.
can the piston unscrew completely from the shaft or is there a stop at the end and are the springs the same strength?
The piston can be unthreaded from the shaft. What springs are you referring to?
The ecm does not know where the iacv piston is on startup, so the engineers have programmed a simple routine in the ecm by extending the travel a few steps more than required to get to one end ( either open or closed ) from there it knows the piston is at the end of travel and moves the piston in reverse----- by the amount of steps required for the operating temperature ect.----- and now the ecm knows that the piston is in the correct position to start the engine.
So does this mean that if the valve is not threaded down completely when it is installed (like mine was when I removed it) then the ECM will automatically compensate and send the proper signal to the motor to properly locate the valve?
I would listen to any noise that is different between old and new iacv, i am sure you have given us the clue with the different sound when it is not behaving but i cannot decode the hint for now.
I will operate both valves while holding them in my hand and report back my observations.
If you switch on in the 30% ( warm running position in which you found it ) i think it will go to one end first and then move back some distance.
So, then the fact that my valve was not threaded completely to the bottom of the threads when I removed it (the way it is supposed to be when installed) makes no difference? I was hoping that this was the root cause of my problem.
Thank you so much for your help Max. I don't think I'll be able to get back to the bike until this Saturday, but I will keep this thread updated as I progress.
It is not magnetic. I think it's aluminum (it's real light weight), but it is shiny in appearance. It's possible that it's a hard plastic, and I will have a closer look at this and get back with a better answer.
can the piston unscrew completely from the shaft or is there a stop at the end and are the springs the same strength?
The piston can be unthreaded from the shaft. What springs are you referring to?
The ecm does not know where the iacv piston is on startup, so the engineers have programmed a simple routine in the ecm by extending the travel a few steps more than required to get to one end ( either open or closed ) from there it knows the piston is at the end of travel and moves the piston in reverse----- by the amount of steps required for the operating temperature ect.----- and now the ecm knows that the piston is in the correct position to start the engine.
So does this mean that if the valve is not threaded down completely when it is installed (like mine was when I removed it) then the ECM will automatically compensate and send the proper signal to the motor to properly locate the valve?
I would listen to any noise that is different between old and new iacv, i am sure you have given us the clue with the different sound when it is not behaving but i cannot decode the hint for now.
I will operate both valves while holding them in my hand and report back my observations.
If you switch on in the 30% ( warm running position in which you found it ) i think it will go to one end first and then move back some distance.
So, then the fact that my valve was not threaded completely to the bottom of the threads when I removed it (the way it is supposed to be when installed) makes no difference? I was hoping that this was the root cause of my problem.
Thank you so much for your help Max. I don't think I'll be able to get back to the bike until this Saturday, but I will keep this thread updated as I progress.