Why does my car RPM go down?
Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die.
Why is it bad to rev your engine when its cold?
It helps distribute oil throughout the engine and get the engine block and engine oil up to temperature. Revving the engine won’t speed up the process. In fact, that could cause easily avoided damage. Cold revving causes abrupt temperature changes that create stress between the engine’s tight-fitting components.
Is it OK to rev a cold engine?
It’s not a good idea to rev a cold engine. A small warm up period is ok. Most importantly, drive gently until the engine is reasonably warm.
Why does the starting RPM drop when it’s cold?
It is normal that the starting rpm is dropping when it’s cold. The battery is struggling a bit to deliver power needed to turn the starter. When it’s cold the engine shrinks a little and makes is harder to start. I will recommend you to start the engine and then let it run for a couple of minutes.
What’s the normal idle RPM for a car?
However, in the warm temperatures (when the temp sensor reads 40°F (4°C) or above), it’s always starting up with a 1.6K RPM idle, no exceptions, unless the engine is already warm. When the engine is warm, the RPM is generally around 600 to 700 RPM when idle. Is it normal for…
Can a car start when the engine is cold?
From a mechanical point of view, if the engine would be at the same settings as when warm, the cold engine would have lower rpm (and stall/not start), so: yes. But cars nowadays have a “cold start device” that will raise the rpm after a cold start until the engine is warm.
Why does the engine start at 600 rpm?
For gasoline cars, you have then a longer period where the minimum rpm is raised (over the warm “proper” idling which you quote for your car at 600 – 700 rpm) because the convertor and λ probe need to be warmed up asap so they start to work, even if you do not drive but idle.