My car (93 miata) has been suffering from low idle so I decided to raise it a little bit but I have no idea where to put the new speed at or at what temperature should I make this adjustment, so here are few questions I have about idle speed:
- Should the idle speed be adjusted when the engine is hot (like after a good highway drive) or when the engine is warm. I imagine the former because that is where the car will be spending most of its time?
- Which rpm range should I pick for my engine or how can I tell which range to choose from for my new idle speed?
- Does having a high idle (ex: 1.1/2k) signify anything but more fuel consumption? would it increase wear? isn't the engine spending a small amount of time in idle that it is not that significant, and really the engine is already operating at a much higher speed most of the time.
- I heard that engines are not running really efficiently at idle, does this statement has any truth to it and if so why?