TEST ACTION APPLICABILITY
2 NOTE: Reviewing the vehicle repair history may aid in the repair of the
misfire condition.
Visually and physically inspect the engine for any of the following conditions.
- Worn serpentine belt
- Binding Engine-Driven accessories.
- Misaligned water pump, P/S pump and A/C compressor pulleys
- Improper CKP sensor mounting
- Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector,
Ign coil, etc.
- Vacuum leaks
- Restricted Air Induction system
NOTE: Verify the integrity of the powers and grounds for the PCM.
Were any of the above conditions present?
All
Yes → Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
3 Turn the ignition off.
Disconnect the Ignition wire from the spark plug.
NOTE: Before continuing, inspect the ignition wire for damage or carbon
tracking. Replace as necessary.
Install a spark tester to the ignition wire.
While cranking the engine, observe the spark coming from the spark tester.
NOTE: A crisp blue spark should be generated that is able to jump the gap
of the spark tester.
Is good spark present?
All
Yes → Go To 4
No → Go To 14
4 Turn the ignition off.
Remove the Spark Plug.
Inspect the Spark Plug for the following conditions.
- Cracks
- Carbon Tracking
- Foreign Material
- Gap size out of specifications
- Loose or broke electrode
NOTE: Lightly tap the bottom of the spark plug on a solid surface. The
electrode in the spark plug should not move.
Were any of the above condition present?
All
Yes → Replace the Spark Plug.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 5
124
DRIVEABILITY - NGC
P0300-MULTIPLE CYLINDER MISFIRE — Continued
To Next Page
Loading...
