Carburetor Off-Idle Operation Quiz

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What is the main purpose of a fast idle solenoid?

To increase engine speed when the engine is turned off

To quickly close the throttle plates when the engine is turned off

To keep the throttle plates open to avoid dieseling (correct)

To adjust the idle speed of the engine

What is a common problem that the fast idle solenoid helps to address in newer emission-controlled vehicles?

Lower fuel octane ratings

Slower idle speeds

Low engine temperatures

Leaner fuel mixtures and higher operating temperatures (correct)

How does the fast idle solenoid work to increase engine speed?

It adjusts the position of the solenoid plunger to hold the throttle plates open (correct)

It closes the throttle plates when the engine is turned on

It opens the throttle plates when the engine is turned off

It increases the flow of fuel to the engine when the solenoid is activated

What is the purpose of the throttle return dashpot?

To keep the throttle from closing too quickly when the accelerator pedal is released Signup and view all the answers

Which type of vehicle is the throttle return dashpot commonly used on?

Automatic transmission vehicles Signup and view all the answers

What would happen if a vehicle did not have a throttle return dashpot?

The engine would stall when the accelerator pedal is suddenly released Signup and view all the answers

What component picks up heat from the exhaust without sending any actual exhaust fumes to the choke mechanism?

Heat tube Signup and view all the answers

During warm-up, why does the engine need to run at a faster idle speed?

To prevent flooding Signup and view all the answers

What component prevents the throttle plate from closing when the choke is closed?

Fast idle cam Signup and view all the answers

What is responsible for increasing the engine idle speed during cold engine operation?

Fast idle cam Signup and view all the answers

What device is used to admit air if the engine floods when cold?

Choke un loader Signup and view all the answers

Which mechanism can be either mechanical- or vacuum-operated?

Choke un loader Signup and view all the answers

What happens when the driver presses down on the accelerator?

The off idle ports are exposed to intake manifold vacuum Signup and view all the answers

Which system provides extra fuel when changing from the idle system to the high-speed system?

Acceleration System Signup and view all the answers

What would happen if there was no acceleration system in place?

Engine would stall or hesitate Signup and view all the answers

What is the purpose of the accelerator pump in the acceleration system?

To develop pressure to force fuel into the air horn Signup and view all the answers

Which part of the acceleration system prevents a lean air-fuel mixture?

Pump Check Weight Signup and view all the answers

What action provides enough extra fuel to mix with additional air around the throttle plate?

Throttle plate swings open Signup and view all the answers

What is the purpose of the start spring in the all speed governor?

To hold the control lever against the governor sleeve at low cranking speed Signup and view all the answers

What happens when the adjusting lever is moved to the idle position after starting the engine?

The centrifugal force of the flyweights is counterbalanced by the force of the idle and damper springs, maintaining idle speed Signup and view all the answers

What happens when the adjusting lever is moved to the full load position?

The control spring tension is increased, immediately increasing the effective stroke and engine speed Signup and view all the answers

How does the governor regulate the maximum engine speed?

When engine speed overcomes the predetermined maximum, flyweight force overcomes the tension of the control spring Signup and view all the answers

What is the role of the damper spring in the all speed governor?

To provide stability by counterbalancing the flyweight force at idle speed Signup and view all the answers

What happens to the spill ring when the engine speed exceeds the predetermined maximum?

The spill ring is released, reducing the fuel flow Signup and view all the answers

Where is the hydraulic injection-timing device located on the fuel pump?

At the bottom of the pump, perpendicular to the longitudinal axis Signup and view all the answers

What is the main purpose of the governor in a VE type injection pump?

To control the engine speed during various load conditions Signup and view all the answers

How does the timer piston move as engine rpm rises?

It moves to the left, retarding injection timing Signup and view all the answers

What component converts the lateral motion of the timer piston into rotational motion of the roller ring?

The slide pin Signup and view all the answers

What are the two types of governor used in the VE type injection pump?

All-speed and min./max. Signup and view all the answers

How does the timer spring affect the movement of the timer piston?

It forces the piston to move in the injection "retard" direction Signup and view all the answers