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P0303

4K views 3 replies 3 participants last post by  Djohnson0908 
#1 ·
Hi... I have an 07 - 300... I am throwing this code... changed the 02 sensor on the drivers (passenger ok)... changed the fuel injector and it’s still happening... running real rough and hesitant acceleration.. any suggestions???
 
#3 ·
From the service manual:

P0303-CYLINDER 3 MISFIRE

When Monitored:
Any time the engine is running, and the adaptive numerator has been successfully updated.

Set Condition:
When more than 1.0 % misfire rate is measured during two trips, or with 10% to 30% misfire rate during on
trip. Three good trips to clear the MIL.

Possible Causes:
ASD RELAY OUTPUT 2 CIRCUIT
INJECTOR CONTROL NO.3 CIRCUIT
COIL CONTROL NO.3 CIRCUIT
IGNITION WIRE
SPARK PLUG
IGNITION COIL
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR
ENGINE MECHANICAL PROBLEM
PCM
 
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