Exam 26: Ignition Systems

Computer-controlled ignition timing is being discussed. Technician A says when excessive wheel slippage occurs, the PCM will advance the timing to increase the torque output from the engine. Technician B says to provide smooth shifting of an automatic transmission, the PCM will temporarily retard the ignition timing to reduce the engine's torque when the transmission is beginning to change gears.

Why is the correct spark plug heat range important?

What is an engine's firing order?

Very few newer engines are equipped with a distributor.

The ignition coil is essentially a pulse ____________________.

Name various locations of sensing devices used to identify engine component position for ignition timing.

Reach, heat range, and air gap are all characteristics that affect the performance of which ignition system component?

The period of time during which there is primary current flow through the ignition coil is called ____________________.

The distributorless ignition system of a V-6 engine may be designed with three ignition coils.

A spark plug's ceramic core or insulator acts as a heat conductor.

A ____________________ ignition system has one ignition coil per cylinder and also uses spark plug wires.

A Hall-effect sensor has these three wires connecting it to the PCM: a 5- to 12-volt reference voltage, a ground, and a(n)____________________.

Ignition timing is being discussed. Technician A says when the engine idle speed moves away from the desired idle speed, the PCM will adjust the timing to stabilize the engine speed. Technician B says when a knock is detected, the PCM retards the timing in fixed steps until the knock disappears. Who is correct?

Coil-over-plug ignition systems are being discussed, Technician A says COP coils have less time between each firing cycle, which increases the heat in the coil and can cause premature failure. Technician B says the COP system allows the ignition timing for each cylinder to be individually changed for maximum performance as the system responds to knock sensor signals. Who is correct?

Until 1994 all ignition systems used some type of distributor.

Some engines use a ____________________ sensor designed with an LED, a phototransistor, and a slotted disc to identify crankshaft position.

How are engine misfires detected?

Magnetic pulse generators produce a weak DC voltage when the teeth of the trigger wheel rotate past the pickup coil.

What is an advantage of EI ignition?

If the required voltage to fire a spark plug is greater than the available voltage, the result is known as a ____________________ condition.