hw 9

Question 1

A hot-range spark plug has a shorter heat path than a cold-range spark plug.

Answer 1

‘False’.

Question 2

The ignition coil is both a primary and secondary ignition component.

Answer 2

‘True’.

Question 3

Ignition cables are usually made of solid wire which acts as a resistor in the secondary circuit.

Answer 3

‘False’.

Question 4

Carbon tracking is the formation of carbonized dust between distributor cap terminals.

Answer 4

True’.

Question 5

The parade pattern on an oscilloscope displays cylinder patterns from right to left.

Answer 5

False’.

Question 6

Technician A says the magnetic pick-up may be tested using a voltmeter to measure the AC voltage during cranking. Technician B says the Hall-effect sensor produces a square wave pattern on an oscilloscope. Who is correct?

Answer 6

Both A and B

Question 7

Technician A says to adjust base timing on a distributor ignition system, the distributor housing is rotated. Technician B says on a Ford vehicle with a TFI IV ignition system, the SPOUT connector must be disconnected to check base timing. Who is correct?

Answer 7

Both A and B

Question 8

The raster pattern on an oscilloscope displays cylinder patterns:

Answer 8

Stacked one above the other

Question 9

Base timing is the initial timing specified by the:

Answer 9

Manufacturer

Question 10

Technician A says if the firing voltage is higher than normal the burn time will decrease. Technician B says if the firing voltage is lower than normal the burn time will decrease. Who is correct?

Answer 10

Technician A only

Question 11

Ignition modules control the:

Answer 11

Ground connection to the primary coil winding

Question 12

The ignition switch, primary winding, and module are all components of the:

Answer 12

Primary ignition circuit

Question 13

Technicians A says as engine speed slows, the timing should be retarded or have less advance. Technician B says typically, the more load on an engine, the less spark advance is needed. Who is correct?

Answer 13

Both A and B

Question 14

The switching device in the ignition system is sometimes referred to as a:

Answer 14

Ignition control module

Question 15

Which of the following could cause a weak spark condition?

a.

High resistance on the ground side of the ignition module
b.

Primary coil winding resistance of 50 ohms
c.

High resistance in the ignition coil power feed circuit
d.

All of the above

Answer 15

All of the above

Question 16

Which of the following represents the amount of voltage necessary to sustain the spark across the spark plug gap?

Answer 16

Spark voltage

Question 17

An oscilloscope test shows firing lines the same, but abnormally high. This is the result of:

Answer 17

A lean air/fuel mixture

Question 18

For maximum engine power to be obtained, maximum cylinder pressure should occur:

Answer 18

10 - 20 after TDC

Question 19

Technician A says the ignition timing must be fully advanced when the engine is operating at maximum load. Technician B says ignition timing is retarded from total under maximum load. Who is correct?

Answer 19

Technician B only

Question 20

The triggering device in an electronic ignition system is used to indicate crankshaft position.

Answer 20

True’.

Question 21

On most electronic ignition systems base timing needs to checked and adjusted whenever the system is serviced.

Answer 21

False’.

Question 22

A shorted secondary coil winding provides an ohmmeter reading above the specified resistance.

Answer 22

‘False’

Question 23

A shorted ignition coil may damage the ignition module.

Answer 23

‘True’.

Question 24

Spark plugs with iridium tips should not be re-gapped.

Answer 24

True’.

Question 25

Which of the following is not part of the primary circuit?

Answer 25

Spark plugs

Question 26

The resistance of the primary winding of an ignition coil is typically:

Answer 26

Less than 2 ohms

Question 27

Technician A says some EI systems fire two spark plugs at each cylinder. Technician B says In Ford’s dual plug system only one spark plug is fired in each cylinder during engine start-up. Who is correct?

Answer 27

Both A and B

Question 28

A Hall Effect switch can be checked with all of the following except:

Answer 28

An A/C voltmeter

Question 29

On a Ford EI system, the wire that the PCM uses to control spark timing is the:

Answer 29

SPOUT wire

Question 30

A Hall Effect switch is being analyzed on a lab scope. The high part of the signal measures 5.0 volts. Ideally, what should the low part of the signal read?

Answer 30

0.0 volts

Question 31

The secondary winding resistance of an EI ignition coil indicates 1.5 ohms. Technician A says the coil should be replaced. Technician B says the coil winding is shorted. Who is correct?

Answer 31

Both A and B

Question 32

Technician A says in a COP system the PCM can adjust ignition timing for each individual cylinder. Technician B says firing order in a COP system is controlled by the IC modules. Who is correct?

Answer 32

Technician A only

Question 33

The camshaft position sensor in a GM fast start system is used to sequence the:

Answer 33

Injectors properly

Question 34

On a COP equipped engine, if the crankshaft sensor becomes shorted: a. The ignition coils will not fire the spark plugs b. The fuel injectors will not pulse c. Engine rpm will not display on a scan tool d. All of the above

Answer 34

All of the above

Question 35

Which statement is true about companion cylinders?

Answer 35

When one cylinder is on the exhaust stroke the other is on the compression stroke

Question 36

In an ion sense ignition system, information about the combustion chamber is determined by the:

Answer 36

Spark plug

Question 37

Which of the following is not a standard location for a camshaft position sensor?

Answer 37

Behind the crankshaft pulley, On the flywheel

Question 38

Crankshaft position sensors are located in each of these places except:

Answer 38

In the cylinder head