This winter I was thinking of doing some proactive maintenance of my 6th Gen VFR. Among others, I was thinking of changing the throttle body insulators given that they are made from rubber, and due to old age who knows how good they still are.
Due to lack of time, I didn't manage to do it, but a question pops up in my mind from time to time. When do I know that my insulators are bad?
Last time when I checked them it was around 1 year ago when I replaced the cooling thermostat and they seemed in pretty good shape. I don't really have a bad fluctuating idle, maybe only a little bit, but that may well be the throttle valves being a bit out of sync. So how will a small leak in the insulators manifest itself?