What is the P0307 fault code and what does it mean? What is the Cylinder7 Misfire Detected description like? How do I fix the P0307 fault code What are the causes and symptoms of the P0307 error code?
What is the P0307 fault code? What does it all mean?
It is vital that the engine operates properly by efficiently burning fuel and air. Each cylinder is connected to the crankshaft, and each has a sparkplug to ignite the mixture of air and fuel. After ignition, combustion occurs and the resulting energy gives power to crankshaft. The crankshaft speed will decrease or increase if there are misfires in the cylinders.
The powertrain control module (PCM), when it detects a misfire or misfire in the engine number 7 cylinder, stores a P0307 Code in its memory.
What is the P0307 Fault Code and Why Does It Happen?
Engine misfires can result in a wide range of problems and can be caused from many different factors. Here are some possible causes.
- – A defective spark plug was found in the 7th cylinder
- – The 7th cylinder is not compressed.
- – Spark plug wires that are worn or defective
- – Wear or defective ignition coils
- – Defective distributor cap for some vehicles
- – Defective delivery roll (some vehicles).
- – Defective fuel injector
- – EGR valves or EGR pipes clogged
- – Valves that are either melted or burnt
- – Misfire timing
- – Vacuum leaks
- – Low fuel pressure
- – Leaky head gasket
- – Defective camshaft sensor
- – Defective crankshaft sensor
- Sensor for defective mass air flow (MAF).
- – Defective oxygen (O2) sensor
- – Defective throttle position sensor
- – Defective catalytic convertor
- – Issues with the fuel injector circuit
- – Internal engine problems such as worn camshaft lobes
- – Defective PCM
What are the symptoms of the P0307 Fault Code?
- Depending on the severity of the misfire, check that your engine light is on or flashing.
- – Engine running hard, or not at all
- – Engine hesitation during acceleration
- – Engine stops at idle
- – Insufficient engine power
- – The engine is jerky to operate
- – Irregular idle speeds (fluctuations).
- – Increased fuel use
If the crankshaft speed increases or decreases by between 2-10%, then the check engine lamp will turn on continuously and steady. The check engine lamp will blink continuously if the crankshaft speeds exceed 10%. Any deviation of more than 10% in crankshaft speed is a sign of severe misfire.
How do I fix the P0307 fault code?
- – Replacing defective or damaged spark plugs
- – Replacing damaged spark plug wires
- – Repairing damaged ignition coils and/or cables
- Repair or replacement of an EGR valve that is blocked
- – Repair or replacement EGR pipes clogged
- – Repair of damaged or faulty valves
- – Replacing your head gasket
- – Replacing the defective sensor on the camshaft
- – Replacing the defective crankshaft sensor
- – Replacing the defective MAF sensor
- – Replacing the defective oxygen sensor
- Replacing a damaged throttle position sensor
- Repairing a damaged fuel injector
- – Replacing the defective catalytic converter
- If necessary, diagnose and repair any other fault codes
- – Repairing internal engines components, if necessary
- – The engine must be replaced if the cylinder becomes damaged.
- – Reprogramming or replacement of the PCM, if required
All spark plugs need to be replaced if one spark plug is defective. Spark plug gaps can also lead to ignition failure. Spark plug gaps must be in compliance with the manufacturer’s specifications.
It is easiest to locate the ignition coil to check if it has failed. The ignition coil is responsible in such cases.
How serious is the Fault Code P0307?
Misfired vehicles may not start or stop at all. Driving problems can make it unsafe to operate the vehicle. The P0307 fault code should be considered serious. This should be fixed as soon as possible.
