Is a cold engine bad?
When your car engine is cold, the fuel injectors send more fuel through the system. So the longer you let a cold engine idle, the more fuel you waste and the more you increase the chance of fuel residue build up. Fuel residue build up can lead to poor engine performance and a reduction in mileage.
Can you rev a cold start?
Since the engine’s idle speed is higher during a cold start, how about revving it even higher to “help it along”? According to our engineer, this would be detrimental. You should let the engine warm up on its own. Revving the engine may hasten the warm-up process.
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.
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.
What causes the engine rpm to go up when idle?
When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idling. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop.
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.
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.
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.
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.
Why does my car idle at 700 rpm?
There is an air filter which prevents debris from the air from getting into the chamber. But if this air filter is dirty or clogged, then there will be less clean air passing through it. This will cause the engine to idle rough. Your engine should normally get to around 700 RPM after you start the vehicle.