How does an EFI system control idle speed?
An EFI system controls idle speed by using a combination of the air allowed past the mechanical curb idle setting combined with a measured amount of air bypassed by the IAC. The ideal combination is where the throttle blades flow a majority of the idle air with a small contribution from the IAC motor setting.
How long does it take for sportsman EFI to restart?
Waiting about 2 minutes (truly not very long at all) it will restart and run just fine. Then seems to run beautifully. I haven’t been greatly concerned because the wait to get it working again is soooo short.
Where does the power go in an EFI system?
All EFI systems operate on electrical signals from sensors that normally operate on a 0-5-volt scale. This leaves very little room for error with regard to proper grounds. So it is essential that the main power and ground leads go directly to the battery.
How much fuel does a go EFI fitech control?
Your Go EFI FiTech is designed to control fuel for engines that make up to 600 horsepower. That’s a bunch of power but it also could be called upon to control a very mild engine. This is where the variables begin to stack up. Typically, a large displacement engine will demand more air than a small displacement engine.
An EFI system controls idle speed by using a combination of the air allowed past the mechanical curb idle setting combined with a measured amount of air bypassed by the IAC. The ideal combination is where the throttle blades flow a majority of the idle air with a small contribution from the IAC motor setting.
What happens when the idle speed is too high?
The ECU then uses rpm feedback to position the IAC. If the engine idle speed needs to increase, the IAC will open a few steps, allowing more air into the engine. Or, the IAC motor will move close to fully closed if the idle speed is too high.
What causes an engine to stall at idle?
If the ISC valve is gummed up with fuel varnish or dirt, it may stick, preventing the engine from maintaining the proper idle speed when the throttle closes. A faulty idle speed control circuit may also allow the engine to stall when idling if it fails to compensate for idle loads placed on the engine by the charging system or A/C compressor.
How can I control the idle speed of my car?
This is done to control idle speed electronically. With a carburetor, if you need more idle speed you just turn the curb idle screw clockwise and this opens the throttle blades to allow more air into the engine. That’s simple and very effective.
What kind of EFI system does a Harley Davidson use?
EFI systems that sense engine load by the use of the throttle or TPS (throttle position sensor) are referred to as an Alpha-N system. EFI systems that sense engine load by the use of a MAP sensor are referred to as a Speed-Density system. Harley-Davidson has used both types of EFI systems on its vehicles.
How does an electronic fuel injection system work?
In its simplest terms, an electronic fuel injection (EFI) system is a computer controlled fuel delivery system. This electronic control unit (ECU) reads various sensors located on the vehicle and makes the determination of how much fuel to allow the engine to have based on this information.
How is the fuel pump relay and idle solenoid activated?
The idle solenoid is activated by a 12-volt signal and allows additional air into the intake manifold to increase the idle RPMs. The main relay is activated by the ignition switch and provides power to all components in the EFI system. The fuel pump relay is activated by the EFI ECU when the engine is running.