Cylinder 5 Misfire Detected
The engine computer detected that cylinder 5 is misfiring, meaning it's not firing properly or at all during combustion cycles. This causes incomplete combustion, reduced power, and increased emissions.
What You Might Notice
- Engine hesitation or stumbling during acceleration
- Rough idle or vibration at idle
- Difficulty starting the engine
- Loss of power or poor fuel economy
- Check engine light illuminated
Most Common Causes
- 1
Faulty spark plug or ignition wire
A worn, fouled, or gapped spark plug or damaged ignition wire prevents proper combustion in cylinder 5. This is the most common cause of misfire codes.
- 2
Faulty ignition coil pack
A defective coil pack fails to generate sufficient voltage to fire the spark plug, preventing cylinder 5 from igniting fuel mixture properly.
- 3
Faulty fuel injector
A clogged, leaking, or electrically faulty fuel injector on cylinder 5 prevents proper fuel delivery, resulting in a lean or rich misfire condition.
- 4
Low compression or burned valve
Poor cylinder compression from worn rings, leaking valves, or a burned exhaust valve reduces combustion efficiency in cylinder 5, causing misfire.
How to Diagnose It
- 1
Check Faulty spark plug or ignition wire — A worn, fouled, or gapped spark plug or damaged ignition wire prevents proper combustion in cylinder 5. This is the most common cause of misfire codes.
- 2
Check Faulty ignition coil pack — A defective coil pack fails to generate sufficient voltage to fire the spark plug, preventing cylinder 5 from igniting fuel mixture properly.
- 3
Check Faulty fuel injector — A clogged, leaking, or electrically faulty fuel injector on cylinder 5 prevents proper fuel delivery, resulting in a lean or rich misfire condition.
- 4
Check Low compression or burned valve — Poor cylinder compression from worn rings, leaking valves, or a burned exhaust valve reduces combustion efficiency in cylinder 5, causing misfire.
How to Fix It
- 1
Replace spark plug and ignition wire
Inspect and replace the spark plug for cylinder 5, checking for wear, fouling, or incorrect gap. Replace the ignition wire if damaged or corroded.
- 2
Replace ignition coil pack
Test the coil pack for cylinder 5 with a multimeter or swap with another cylinder's coil to verify failure. Replace if defective.
- 3
Clean or replace fuel injector
Use fuel injector cleaner or have the injector professionally cleaned; if cleaning fails, the injector may need replacement to restore proper fuel delivery.
- 4
Perform compression test and valve inspection
Test cylinder 5 compression; if low, inspect for worn piston rings, damaged valves, or gasket leaks. May require cylinder head removal for valve repair.
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