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HelpForCars.net- All Aobut Automotive Repairs

P0307 CHEVROLET

P0307 CHEVROLET - Cylinder 7 Misfire Detected

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Possible causes
- Faulty spark plug 7
- Clogged or faulty fuel injector 7
- Faulty ignition coil 7
- Fuel injector 7 harness is open or shorted
- Fuel injector 7 circuit poor electrical connection
- Ignition coil 7 harness is open or shorted
- Ignition coil 7 circuit poor electrical connection
- Insufficient cylinder 7 compression
- Incorrect fuel pressure
- Intake air leak
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Tech notes
The P0307 code means that the cylinder 7 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 7. 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 7 is Misfiring.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0307 CHEVROLET 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.
CHEVROLET Technical Service Bulletins for P0307 code
2007 CHEVROLET AVALANCHE ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET SILVERADO ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET TAHOE ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET TAHOE 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET SILVERADO 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET AVALANCHE 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2007 CHEVROLET SILVERADO FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS Details
2007 CHEVROLET SILVERADO 1500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS Details
2007 CHEVROLET SILVERADO 2500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS Details
2007 CHEVROLET SILVERADO 3500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS Details
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