It is intentional, it is called high idle. It helps warm the engine to proper operating temperature.
open or missing thermostat
750 to 900 rpm Whem it is warm, cold start 1200 to 14000 rpm
rev limiter will only let the RPM's get so high then it cuts back
Most fuel injected automobiles rev when first started, most to about 14-1600 RPM, then settle down within 700-900 RPM after 3 to 5 seconds. The exception to this....On a cold start, or when the car is started for the first time (that day), the cold start will hold the RPM higher for a longer period of time. Unless your car is idling high for an extended period of time or reving above 2000 RPM, I would not be concerned. one indicator of a problem is your CEL (Check Engine Light), if it's on, you more than likely have a sensor issue and need to have it repaired.
when u first start the car it will idle high, around 1.5 rpm to 2 rpm. when its warm up it should idle between 700-1000 rpm
cause the coolant temp is low , automobiles tend to do that when there cold
Up to 1000-1200 RPM on start-up is normal until the engine reaches a certain temperature. It should drop to normal idle speed within a minute or two (a little longer in extreme cold weather). The purpose of the higher start-up RPM's is to get oil circulating sooner and to warm up the engine faster.
In the context of the 1FZ-FE engine, "high pitch" typically refers to the sound frequency produced by the engine at a specific RPM, which in this case is approximately 400 RPM. At this low RPM, the pitch would generally be considered low rather than high, as engine sounds tend to increase in frequency (or pitch) with higher RPMs. If you are referring to a specific issue or characteristic at this RPM, additional context would be needed for a more precise explanation.
it only studders at low rpm it runs great at high rpm or accelerating only at idle and take off rpm
RPM is short for Revolutions Per Minute. It is the measurement of how many times your engine is rotating each minute. As you accelerate, your RPM will increase until the next gear is selected, lowering the RPM. RPM is the whole reason for transmissions: if there was only one gear the RPM would get so high that the engine would become damaged. By shifting into higher gears, the RPM is lower and you get better gas mileage.
Flooring the gas petal.
o2 sensor