Checks
| Action
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DEFINITION:
The fuel ignites in the intake manifold, or in the exhaust system, making
a loud popping noise.
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Preliminary Check
|
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Ignition
System Checks
|
| • | Check for adequate ignition coil voltage with a J 26792
spark tester or equivalent. |
| • | Check the spark plugs for any of the following conditions: |
| - | Wet (fuel fouled) plugs. |
| - | A terminal screw that is bent or loose (rotate and pull). |
| - | A ceramic insulator that has cracks, carbon tracking or deposits
(red or black dust) |
| - | A tip insulator that has cracks, carbon tracking, deposits (oil,
carbon, glazing, fuel additive), or is loose (rattles). |
| - | A center electrode that is loose (wiggles side to side) |
| - | An incorrect spark plug gap that is too large or too small. |
| - | Platinum pads that are missing. |
| • | Check for crossfiring between spark plugs (distributor cap, spark
plug wires, and proper routing of plug wires). |
|
Engine Mechanical
Checks
|
| • | Check for any of the following engine mechanical problems: |
| - | Faulty hydraulic lifter assemblies |
| - | Broken or weak valve springs |
| - | Sticking or leaking valves |
| - | Incorrect or worn camshaft |
| • | Refer to Engine Mechanical. |
| • | Check the intake and exhaust system for casting flash or other
restrictions. |
|
Additional
Check
| Check the EGR Valve
for being open all the time. Refer to
Exhaust Gas Recirculation (EGR) System Diagnosis
.
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