The stepper, a.k.a. Idle Air Control Valve (IACV) is much more than a choke. It is used to control the idle speed hot or cold. It also allows more engine braking since it can set up a complete shutoff of the throttle. A mechanical idle control can't do that.... stepper which basically adjust a choke?
Hi, I just bought a second hand triumph 955i stepper motor .A Straight swap for mine anyway and all my cold weird starting issues went away .I finally had time to investigate stepper issue on my TNT and what I found was that there is no any visible movement at all on stepper piston when I switched ignition on. I also started my engine but still there wasn't any movement, so I have strong doubt that is the reason why hoses are plugged..
Is there any tricks try to fix stepper or just find a new one somewhere?
I was about to ask Triumph stepper part number, but then I found it from Engenia web page ( T1240888 ), thank you 👍Hi, I just bought a second hand triumph 955i stepper motor .A Straight swap for mine anyway and all my cold weird starting issues went away .
Thanks for your quick reply.Check the continuity from the stepper connector back to the ECU connector before you start worrying about the ECU.