P0307 on Lincoln
Cylinder 7 Misfire Detected
P0307 on Lincoln vehicles indicates cylinder 7 misfire detected. Au7o has documented this code across 2 Lincoln models — most commonly on Navigator, Town Car. P0307 means the engine computer detected a misfire on cylinder number 7 — that cylinder isn't burning its air/fuel mixture completely or at the right moment. The PCM senses this by watching for tiny slowdowns in crankshaft speed each time cylinder 7 should fire. A misfire wastes fuel, can dump raw fuel into the exhaust, and may damage the catalytic converter over time, which is why a persistent or severe misfire often makes the check engine light flash. You may feel rough idle, shaking, hesitation, or a loss of power. Typical repair costs on Lincoln range from $100 to $1,500, depending on the specific model and root cause.
Common Causes of P0307
- •Worn, fouled, or incorrectly gapped spark plug on cylinder 7
- •Failed ignition coil or coil-on-plug for cylinder 7
- •Faulty, clogged, or leaking fuel injector
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt/leaking valve, head gasket)
- •Damaged spark plug wire or boot (on applicable engines)
- •Carbon buildup or sticking valve
P0307 on Lincoln by Model
Lincoln Navigator(1 issue)
- Navigator 5.4L 3V Triton Spark Plug Breakage on Removal2005-2008
The 5.4L 3-valve Triton V8 in 2005-2008 Navigator (and shared F-150/Expedition) uses a two-piece spark plug (Motorcraft SP-515/SP-546) that frequently snaps off in the cylinder head during removal. The lower portion stays welded into the head by carbon, leaving the upper electrode in the socket. Common at 60,000-100,000 miles when the first plug change is attempted.
Lincoln Town Car(1 issue)
- Coil-on-Plug Ignition Coil Failure and Misfires (4.6L V8)1998-2011
The 1998-up 4.6L 2V V8 uses eight individual coil-on-plug ignition coils whose boots and towers crack with age and heat, allowing spark to track to ground and causing single- or multi-cylinder misfires, rough idle, and stumbling under load. Failures are accelerated when the 1996-2001 plastic intake manifold leaks coolant into the spark plug wells and shorts the coils. It is one of the most common drivability complaints on the platform, well documented across owner forums and diagnostic guides.
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View P0307 across all makes →Frequently Asked Questions
What does P0307 mean on Lincoln?▼
P0307 stands for "Cylinder 7 Misfire Detected." P0307 means the engine computer detected a misfire on cylinder number 7 — that cylinder isn't burning its air/fuel mixture completely or at the right moment. The PCM senses this by watching for tiny slowdowns in crankshaft speed each time cylinder 7 should fire. A misfire wastes fuel, can dump raw fuel into the exhaust, and may damage the catalytic converter over time, which is why a persistent or severe misfire often makes the check engine light flash. You may feel rough idle, shaking, hesitation, or a loss of power. On Lincoln specifically, this code is documented across 2 models.
What causes P0307 on Lincoln vehicles?▼
Common causes on Lincoln: Worn, fouled, or incorrectly gapped spark plug on cylinder 7, Failed ignition coil or coil-on-plug for cylinder 7, Faulty, clogged, or leaking fuel injector, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/leaking valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0307 on a Lincoln?▼
Repair costs on Lincoln range from $100 to $1,500, depending on the specific model and root cause.
Which Lincoln models have P0307 documented?▼
Au7o has documented P0307 on 2 Lincoln models: Navigator, Town Car.