Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that when the car engine starts, the third cylinder isn't working right. It's like trying to ride a bike with one flat tire.
The engine control module (ECM) has detected a misfire in cylinder 3 during the engine start sequence.
The P1346 code indicates that the ECM has identified a misfire in cylinder 3 specifically during the engine's starting phase. This misfire can be caused by issues related to ignition, fuel, or compression in that cylinder.
• Rough engine start
• Check Engine Light illuminated
• Poor engine performance
• Increased fuel consumption
• Engine hesitation
• Faulty spark plug in cylinder 3
• Ignition coil failure in cylinder 3
• Fuel injector problem in cylinder 3
• Low compression in cylinder 3
• Vacuum leak affecting cylinder 3
ECM: Engine Control Module, the computer that controls engine functions.
Misfire: A failure of the air/fuel mixture in a cylinder to ignite properly.
• Use an OBD-II scanner to confirm the code.
• Inspect spark plug and ignition coil for cylinder 3.
• Check fuel injector operation for cylinder 3.
• Perform a compression test on cylinder 3.
• Inspect for vacuum leaks around cylinder 3.
• Replace faulty spark plug in cylinder 3.
• Replace or repair ignition coil for cylinder 3.
• Clean or replace fuel injector for cylinder 3.
• Repair any vacuum leaks found.
• Address any compression issues in cylinder 3.
• OBD-II scanner
• Spark plug socket
• Compression tester
• Fuel injector tester
• Vacuum leak detector
$100 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regularly replace spark plugs.
• Perform routine engine maintenance.
• Use high-quality fuel.
Engine Performance
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional.
• Avoid hard acceleration until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on engine components.
Misfire codes have been common in vehicles with ignition and fuel delivery issues, often related to maintenance neglect.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfire can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle parked on a level surface
Cylinder 3 is typically located on the engine block, the exact position depends on the engine configuration.
Q: Can I drive with a P1346 code?
A: It's not recommended to drive with this code as it can cause further engine damage.
Q: How serious is a cylinder misfire?
A: A cylinder misfire can lead to poor engine performance and increased emissions. It should be addressed promptly.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
View options on Amazon
Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.