Exam 27: Ignition System Diagnosis and Service

An engine may start with a faulty camshaft sensor, but it may only run in the ____________________ mode because the fuel injectors cannot be synchronized without the camshaft signal.

Describe two important precautions that should be taken during all ignition system tests.

Spark plug cables from consecutively firing cylinders should ______.

Technician A performs a cylinder performance test [power balance test] to determine which cylinder is misfiring. Technician B uses a vacuum gauge to pinpoint the misfiring cylinder. Who is correct?

A no-start condition on an EI system is being discussed. Technician A says to use a test spark plug to determine whether the problem is in the ignition system. Technician B says that if a noid light is connected to the injector harness and it pulses while the engine is cranked, the triggering unit for the primary ignition circuit should be okay. Who is correct?

All ignition system problems will set a DTC in the vehicle's PCM and can be read with a scan tool.

Gapping the spark plug is only necessary on used spark plugs. New spark plugs have their gaps set at the factory.

Technician A says white or grayish powdery deposits on secondary cables at the point where they cross or near metal parts indicate that the cables' insulation is faulty. Technician B says if the spark plug wire for #2 cylinder is damaged and the other wires look good, replace only the damaged wire. Who is correct?

An ignition control module may overheat if it is not securely mounted.

The air gap between the crankshaft position sensor (CKP)and the trigger wheel is measured with a(n)_____.

Which of the following problems is NOT caused by a misfire?

Which of the following is NOT a cause of spark knock?

Leaner air/fuel mixtures ______.

If the spark line is totally flat, is longer than 2 ms, and is less than 500 volts, there is a good chance that:

A misfire is also called incomplete combustion.

An exhaust gas analyzer will show higher than normal ____________________ when ignition timing is not correct.

Which of the following statements is false?

What is the first step in diagnosing an ignition system problem?

Identify various concerns that may affect the height of spark plug firing lines.

Any hot spot within the combustion chamber can cause ____________________.