Checks
| Action
|
Definition:
The fuel ignites in the intake manifold, or in the exhaust system, making
a loud popping noise.
|
Preliminary Check
| Refer to Important Preliminary Checks
.
|
Ignition System Checks
|
| • | Check for the proper ignition coil output voltage with the spark
tester J 26792
or the equivalent. |
| • | Remove the spark plugs. |
| • | Check for the following items: |
| • | Check the ignition system. Refer to Enhanced Ignition System Diagnosis (Overview)
. |
| • | Check for crossfire between spark plugs (distributor cap, spark
plug wires, and proper routing of the plug wires). Refer to Engine Electrical. |
|
Engine Mechanical
Checks
|
| • | Check the engine for the following the items: |
| - | Intake manifold gaskets, refer to Engine Mechanical. |
| - | Sticking or leaking valves, refer to Engine Mechanical. |
| • | Check the EGR operation for being open all the time. Refer to EGR System Diagnosis (Overview)
. |
| • | Check the intake and exhaust system for casting flash or other
restrictions. Refer to Engine Mechanical. |
|
Fuel System
Checks
|
| • | Perform a Fuel System Pressure Test. Refer to Fuel System Pressure Test
. |
| • | Perform a fuel injector coil test. Refer to Fuel Injector Coil Test
. |
| • | Perform a fuel injector balance test. Refer to Fuel Injector Balance Test
for the 4.3L Fuel Injector Balance Test
. |
|
Additional
Checks
|
| • | Check the EGR gasket for a faulty or loose fit. |
| • | Check the EGR Valve operation for being open all the time. Refer
to EGR System Diagnosis (Overview)
. |
|
