Checks
| Action
|
DEFINITION: Ignition
occurs in the intake manifold, or in the exhaust system, making a loud
popping noise.
|
Preliminary
|
|
Sensor/System
| Check the
following systems for proper operation:
| • | The exhaust gas recirculation (EGR) system |
| • | The positive crankcase ventilation (PCV) system |
| • | The knock sensor (KS) system |
|
Ignition
System
|
| • | Check for proper routing of the ignition control (IC) circuits
in each ignition module assembly connector. |
| • | Check the ignition coils for signs of carbon tracking or damage. |
| • | Check for proper spark plug boot alignment. |
| • | Check the spark plugs for proper heat range and reach. |
|
Engine
Cooling System
|
| • | Check the engine thermostat for proper operation or for the wrong
heat range. Refer to
Thermostat Diagnosis
in Engine Cooling. |
|
Engine
Mechanical
|
| • | Check the following conditions: |
| - | Sticking or leaking valve |
| - | Excessive oil in the combustion chamber-leaking valve seals |
| • | Check for incorrect basic engine parts. Inspect the following: |
|
Additional
Checks
|
| • | Inspect the vacuum hoses for splits, kinks, proper routing, proper
connection, and fuel loading. Refer to the Emission Control Information
label. |
| • | Check the secondary air injection (AIR) check valves for proper
operation. |
| • | Check the exhaust system for possible leaks and/or restrictions. |
|
