What happens when the idle speed goes down?
What happens when the idle speed goes down?
On a mechanically injected engine, which is the fuel delivery on the Mopar engine in the above video, when the engine richens up, the idle drops. As the idle speed goes down, the fuel pump, which is driven by the engine, doesn’t send as much fuel to the engine. That means the motor leans out slightly, increasing the RPM.
What causes a rough idle in a direct injection engine?
In direct injection engines the fuel injector delivers gas right into the cylinder, so the valves never get fuel spray. After shutdown, crankcase vapors rise to the top of the engine and settle on the intake valves where they condense and harden. The result is carbon buildup that can cause a rough engine idle.
How does a fuel injected engine get started?
Following a priming procedure with the electric boost pump then cranking with the mixture at idle cutoff allows the engine to flush out fuel from the injector manifold until an optimal fuel air mixture is reached and the engine starts up.
How is the idle level of a motorcycle controlled?
The same system is used on the first generations of fuel injected motorcycle engines. On the newer fuel injection systems, the throttle valve is controlled but a small stepper engine, and it is the fuel injection ECU (a computer) that is controlling the idle level.
On a mechanically injected engine, which is the fuel delivery on the Mopar engine in the above video, when the engine richens up, the idle drops. As the idle speed goes down, the fuel pump, which is driven by the engine, doesn’t send as much fuel to the engine. That means the motor leans out slightly, increasing the RPM.
Why are some fuel injected engines started at idle?
Quickly moving the mixture to full rich at this point will stabilize the engine at idle with an appropriate throttle setting. Thanks for contributing an answer to Aviation Stack Exchange!
The same system is used on the first generations of fuel injected motorcycle engines. On the newer fuel injection systems, the throttle valve is controlled but a small stepper engine, and it is the fuel injection ECU (a computer) that is controlling the idle level.
How does EFI affect the idle of a car?
Calmer idle characteristics occur for a variety of reasons. First, let’s look at why this rumble occurs with a carburetor and then we’ll get into the EFI differences. All camshafts feature something called overlap. This is where both the intake and exhaust valves are open at the same time.
