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P0303 JEEP

P0303 JEEP - Cylinder Misfire Fault Detected

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Possible causes
- Faulty spark plug 3
- Clogged or faulty fuel injector 3
- Faulty ignition coil 3
- Fuel injector 3 harness is open or shorted
- Fuel injector 3 circuit poor electrical connection
- Ignition coil 3 harness is open or shorted
- Ignition coil 3 circuit poor electrical connection
- Insufficient cylinder 3 compression
- Incorrect fuel pressure
- Intake air leak
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Tech notes
The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
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When is the code detected?
Engine Cylinder 3 is Misfiring.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0303 JEEP Description
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
JEEP Technical Service Bulletins for P0303 code
2004 JEEP LIBERTY ENGINE AND ENGINE COOLING:ENGINE Details
2004 JEEP GRAND CHEROKEE ENGINE AND ENGINE COOLING:ENGINE Details
2004 JEEP GRAND CHEROKEE 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2004 JEEP LIBERTY 061000 ENGINE AND ENGINE COOLING:ENGINE Details
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