Checks
| Action
|
Definition: The fuel ignites in the intake manifold, or
in the exhaust system, making a loud popping noise.
|
Preliminary
Check
| Refer to
Symptoms - Engine Controls
.
|
Ignition System Checks
|
| • | Check for cross-fire between spark plugs, such as the distributor
cap, spark plug wires, and proper routing of the plug wires. |
|
Engine Mechanical Checks
|
| • | Check the engine for the following the items: |
| - | Sticking or leaking valves |
| • | Check the intake and exhaust system for fresh air entering the
exhaust upstream of the catalytic converter or restrictions. |
|
Fuel System Checks
|
|
Additional Checks
|
| • | Check the EGR gasket for a faulty or loose fit. |
| • | Check the secondary air injection (AIR) system for proper operation,
if applicable. |
|
