P0304 Ford Escape
Cylinder 4 Misfire Detected · Powertrain Code · High · Repair: Moderate
What is P0304?
Misfire detected in cylinder 4. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Ford Escape triggers code P0304 (cylinder 4 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Escape.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Escape.
Common Causes on Ford Escape
- Failed coil-on-plug on cylinder 4
- Worn or incorrect gap spark plug on cylinder 4
- Carbon buildup on intake valve (EcoBoost)
- Fuel injector failure or clogging on cylinder 4
Symptoms
- Check engine light (may flash)
- Rough idle with rhythmic miss
- Engine shaking at idle
- Reduced power
- Catalytic converter overheating from unburned fuel if ignored
Notes for Ford Escape
On the 2.7L EcoBoost V6, cylinder 4 is on the rear bank and harder to access — budget extra time for coil and plug replacement.