AutoCodes – Ford – P0307 Ford

P0307 Ford Code - Cylinder 7 Misfire Detected

Quick Answer

Misfire is defined as a lack of combustion in a cylinder due to the absence of a spark, incorrect fuel metering, low compression, or any other cause. Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0307 Ford indicates Cylinder 7 Misfire Detected.
Common causes: Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 50,123

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 09, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0307 Ford Description

Misfire is defined as a lack of combustion in a cylinder due to the absence of a spark, incorrect fuel metering, low compression, or any other cause.
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.
The Malfunction Indicator Lamp (MIL) blinks once per second when detecting a misfire severe enough to cause catalyst damage. If the MIL is in a steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
This Diagnostic Trouble Code (DTC) sets when the misfire detection monitor detects an engine misfire in cylinder 7.

OBDII Code P0307 Ford - Cylinder 7 Misfire Detected - AutoCodes.com — P0307 Ford Code - Cylinder 7 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0307 Ford?

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

How to Fix the DTC P0307 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0307 code means that cylinder #7 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #7. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

There is a Factory Service Bulletin for the 2011 Ford Mustang:
2011 Ford Mustang Factory Service Bulletin OBDII Code P0307
The Factory Service Bulletin recommends reprogramming the Powertrain Control Module (PCM) to resolve the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0307 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0307 Ford code?

Need more information on how to fix the P0307 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0307 Ford code diagnosed by a professional: Find a repair shop in your area

Information for Specific Ford Models

P0307 1997 Ford F150 — Cylinder 7 Misfire Detected
P0307 1998 Ford F150 — Cylinder 7 Misfire Detected
P0307 1999 Ford F150 — Cylinder 7 Misfire Detected
P0307 2000 Ford F150 — Cylinder 7 Misfire Detected
P0307 2001 Ford F150 — Cylinder 7 Misfire Detected
P0307 2002 Ford F150 — Cylinder 7 Misfire Detected
P0307 2003 Ford F150 — Cylinder 7 Misfire Detected

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0307 Ford Code

1. What are common symptoms of OBDII code P0307 on a Ford vehicle?

- Common symptoms of code P0307, indicating a cylinder 7 misfire, may include engine hesitation, rough idling, loss of power, and increased fuel consumption.

2. What are some possible causes of a cylinder 7 misfire in a Ford vehicle?

- Potential causes of a cylinder 7 misfire in a Ford include faulty spark plugs, ignition coil issues, vacuum leaks, fuel injector problems, or low compression in the cylinder.

3. How can I diagnose the source of a cylinder 7 misfire in my Ford with code P0307?

- Diagnostic steps may include checking the spark plugs, inspecting the ignition coil, performing a compression test, scanning for vacuum leaks, and testing the fuel injector for proper operation.

4. Can driving with a cylinder 7 misfire cause further damage to my Ford engine?

- Continuing to drive with a cylinder 7 misfire can potentially lead to damage to the catalytic converter, O2 sensors, or other engine components, so it's advisable to address the issue promptly.

5. How can I repair a cylinder 7 misfire detected by OBDII code P0307 on my Ford?

- Repair options may involve replacing the spark plugs, ignition coil, fuel injector, or addressing any vacuum leaks or compression issues in cylinder 7 to resolve the misfire.

6. Is it recommended to clear the OBDII code P0307 after addressing a cylinder 7 misfire in a Ford?

- After completing the necessary repairs to resolve the cylinder 7 misfire, it is advisable to clear the OBDII code P0307 to reset the engine light and monitor for any recurring issues.

7. Can weather or environmental factors contribute to a cylinder 7 misfire with code P0307 on a Ford?

- Extreme weather conditions, such as very cold temperatures or heavy rain, can potentially exacerbate existing issues leading to a cylinder 7 misfire, so it's important to consider environmental factors.

8. Are there any maintenance tips to prevent cylinder misfires in a Ford and avoid OBDII code P0307?

- Regular maintenance practices, including timely spark plug replacement, fuel system cleaning, and periodic inspection of ignition components, can help prevent cylinder misfires and OBDII codes like P0307.

9. How long can I safely drive my Ford with a cylinder 7 misfire before getting it repaired?

- It is recommended to address a cylinder 7 misfire detected by OBDII code P0307 as soon as possible to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.

10. Should I seek professional help to diagnose and repair a cylinder 7 misfire with code P0307 on my Ford?

- If you are not experienced with diagnosing and repairing engine misfires, it is advisable to seek the assistance of a qualified mechanic to accurately identify and fix the issue to avoid further complications.