P1347 Code - Misfire Cylinder 3 With Fuel Cut-off
Quick Answer
As part of the CARB/OBD regulations, the Engine Control Module (ECM) must determine if a misfire is occurring and also identify the specific cylinder(s) and the severity of the misfire event and whether it is emissions relevant or catalyst damaging. Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak. 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
- P1347 indicates Misfire Cylinder 3 With Fuel Cut-off.
- Common causes
- Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak.
- 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.
Code P1347 Description
The misfire/engine roughness calculation is derived from the differences in the period duration (T) of individual increment gear segments. Each segment period consists of an angular range of 120° crank angle that starts 78° before Top Dead Center (TDC).
If the expected period duration is greater than the permissible value a misfire fault for the particular cylinder is stored in the fault memory of the ECM. Depending on the level of misfire rate measured the control unit will illuminate the "Service Engine Soon" light, may cutoff fuel to the particular cylinder and may switch lambda operation to open-loop. All misfire faults are weighted to determine if the misfire is emissions relevant or catalyst damaging.
What are the Possible Causes of the DTC P1347?
- Faulty Spark Plug
- Faulty Ignition Coil
- Intake vacuum leak
- Faulty Camshaft Position Sensor
- Ignition Coil harness is open or shorted
- Ignition Coil circuit poor electrical connection
How to Fix the DTC P1347?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1347 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.
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Information for Specific Makes
- P1347 Audi — Bank 2 Camshaft Position/Crankshaft Position Sensor Wrong Allocation
- P1347 BMW — Misfire Cylinder 3 With Fuel Cut-off
- P1347 Hyundai — #7 Ion Line Open
- P1347 MINI — Misfire Cylinder 3 With Fuel Cut-off
- P1347 Volkswagen — Bank 2 Camshaft Position/Crankshaft Position Sensor Wrong Allocation
Frequently Asked Questions about P1347 Code
1. What are the common symptoms of OBDII code P1347 (Misfire Cylinder 3 With Fuel Cut-off)?
- Common symptoms include rough idling, engine misfires, loss of power, and illuminated Check Engine Light.
2. What are the potential causes of OBDII code P1347?
- Possible causes of this code include a faulty ignition coil, spark plug, fuel injector, vacuum leak, or wiring issue.
3. How can I diagnose the cause of OBDII code P1347?
- Diagnose the issue by checking the ignition system components, inspecting the fuel injector, performing a compression test, and scanning for other related trouble codes.
4. Can a dirty fuel injector cause OBDII code P1347?
- Yes, a dirty or clogged fuel injector can cause cylinder misfires leading to the triggering of code P1347.
5. How can I repair OBDII code P1347?
- Repair methods may include replacing the faulty ignition coil, spark plug, or fuel injector, fixing any vacuum leaks, and ensuring proper wiring connections.
6. Is it safe to continue driving with OBDII code P1347 present?
- It is not recommended to drive with this code active, as it can lead to further engine damage and decreased fuel efficiency.
7. How can I prevent OBDII code P1347 from recurring?
- Regular maintenance, such as timely spark plug replacement, using high-quality fuel, and addressing engine issues promptly, can help prevent this code from reoccurring.
8. Can a misfire in cylinder 3 with fuel cut-off cause long-term damage to the engine?
- Yes, prolonged misfires can lead to damage to the catalytic converter, engine components, and reduced overall engine performance if left unresolved.
9. Will resetting the Check Engine Light resolve OBDII code P1347?
- Resetting the light may temporarily turn it off, but if the underlying issue causing the misfire is not fixed, the code is likely to reappear.
10. How much does it typically cost to repair OBDII code P1347 at a mechanic?
- The cost of repair can vary depending on the specific cause of the misfire, but it may range from $100 to $500 or more, including parts and labor.
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