Exam 27: Ignition System Diagnosis and Service

Detonation can cause physical damage to the pistons, valves, bearings, and spark plugs.

What basic tools are used when checking a Hall-effect sensor?

While discussing EI service, Technician A says the crankshaft sensor may be rotated to adjust the basic ignition timing. Technician B says the crankshaft sensor may be moved to adjust the clearance between the pickup coil and reluctor on some EI systems. Who is correct?

Spark plug cables from consecutively firing cylinders should ______.

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

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

An occasional glow around a spark plug cable, known as a ____________________ effect, is not harmful but indicates that the cable should be replaced.

Technician A says a fouled spark plug can cause a misfire. Technician B says a bad coil can cause a misfire. Who is correct?

What type of fouling occurs immediately following an overdue tune-up?

Noise symptoms of overly advanced timing include ____________________ or engine knock.

Most engines have a spark duration of approximately _____ milliseconds.

Which of the following statements about carbon tracking is NOT correct?

Carbon ____________________ is the formation of a line of carbonized dust between distributor cap terminals or between a terminal and the distributor housing.

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

Which of the following is NOT the location of the ignition module?

A misfire is also called incomplete combustion.

Some manufacturers recommend the use of special heat-conductive ____________________ grease between the control unit [ignition module] and its mounting surface.

Waste spark EI systems are being discussed. Technician A says a high-resistance spark plug can affect the firing of its companion spark plug. Technician B says improper spark plug torque can cause an engine misfire. Who is correct?

Which of the following is not a common cause of preignition?

A "cranks but does not start" problem on a waste spark type EI system is being diagnosed. When a spark tester is connected to each coil and the starter is engaged, there is no spark. Technician A says the crankshaft position sensor could be the problem. Technician B says the PCM could be the problem. Who is correct?