ASE4 Ignition System Diagnosis and Repair 2

Question 1

A spark plug with a white or light gray insulator tip and no deposits indicates:

Accepted Answer

A lean mixture or overheating condition

Answer

Normal combustion

Answer

A rich mixture

Answer

Oil fouling

Question 2

An ignition coil secondary resistance reads OL (open). This means:

Accepted Answer

The coil secondary winding is open and must be replaced

Answer

The coil is within normal range

Answer

The meter range is set incorrectly

Answer

The coil is shorted

Question 3

A COP (coil-on-plug) ignition system has a misfire on cylinder #4. The technician swaps the coil from #4 to #7. If the misfire moves to cylinder #7, this indicates:

Accepted Answer

The coil is the cause of the misfire

Answer

The fuel injector on #4 is faulty

Answer

The spark plug on #4 is fouled

Answer

A compression problem on #4

Question 4

Ignition timing that is too far advanced will cause:

Accepted Answer

Hard starting and detonation under load

Answer

Black smoke from the exhaust

Answer

A rich air/fuel mixture

Answer

Low cylinder compression

Question 5

A scan tool shows ignition timing retarded by 8° from base timing. This is MOST likely caused by:

Accepted Answer

The knock sensor detecting detonation

Answer

A faulty crankshaft position sensor

Answer

A vacuum leak at the intake manifold

Answer

A failing camshaft position sensor

Question 6

What is the function of the camshaft position sensor in a modern distributorless ignition system?

Accepted Answer

It identifies cylinder #1 TDC for sequential fuel and spark delivery

Answer

It controls the dwell angle of the coil

Answer

It measures camshaft advance angle for VVT control only

Answer

It replaces the crankshaft position sensor if it fails