Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Symptom Chart - Engine Performance
2021 Ford Edge SE, 4WDSECTION Symptom Chart - Engine Performance
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
| Symptom | Possible Sources | Action |
|---|---|---|
| Difficult starting | Inoperative or damaged glow plug system Inoperative or damaged fuel system Inoperative or damaged starting system |
Refer to the appropriate Engine article for the procedure. Refer to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) . |
| Damaged charging system/ battery | REFER to: Charging System - 3.0L Power Stroke Diesel . TEST the system for normal operation after the repair. | |
| Burnt valve | INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Worn piston | INSTALL a new piston. TEST the system for normal operation after the repair. | |
| Worn piston rings | INSTALL new piston rings. TEST the system for normal operation after the repair. | |
| Worn cylinder | INSTALL a new cylinder block. TEST the system for normal operation after the repair. | |
| Damaged head gasket | INSTALL a new cylinder head gasket. TEST the system for normal operation after the repair. | |
| Poor idling | Inoperative or damaged EGR system | Refer to the appropriate Engine article for the procedure. Refer to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) . |
| Inoperative or damaged cooling system Inoperative or damaged fuel system |
Refer to the appropriate Engine article for the procedure. | |
| Incorrect valve-to-valve seat contact | INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Damaged head gasket | INSTALL a new cylinder head gasket. TEST the system for normal operation after the repair. | |
| Engine runs rough | Inoperative or damaged fuel system Leaking or damaged CAC, intake manifold or gaskets EGR system fault Inoperative or damaged cooling system Malfunctioning or damaged air intake system |
Refer to the appropriate Engine article for the procedure. |
| Burnt or sticking valve | INSTALL a new valve. TEST the system for normal operation after the repair. | |
| Weak or broken valve spring | INSTALL a new valve spring. TEST the system for normal operation after the repair. | |
| Worn valve guides, valves and seals | INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Excessive oil consumption | Leaking oil | REPAIR oil leakage. TEST the system for normal operation after the repair. |
| Blocked or restricted turbocharger oil drain pipe | INSPECT the turbocharger drain pipe. REPAIR as necessary. TEST the system for normal operation after the repair. | |
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test. REFER to: Turbocharger . TEST the system for normal operation after the repair. | |
| Malfunctioning crankcase vent oil separator | REPAIR or INSTALL new components as necessary. TEST the system for normal operation after the repair. | |
| Oil dilution (fuel) | CHANGE oil to correct specification. TEST the system for normal operation after the repair. | |
| Worn valve stem seal | INSTALL a new valve stem seal. TEST the system for normal operation after the repair. | |
| Worn valve stem or valve guide | INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Sticking piston rings | INSTALL new piston rings. TEST the system for normal operation after the repair. | |
| Worn piston ring groove | INSTALL a new piston and piston pin. TEST the system for normal operation after the repair. | |
| Worn piston or cylinder | INSTALL a new piston or cylinder block. TEST the system for normal operation after the repair. | |
| Oil in coolant | Leaking head gasket Damaged cylinder block Damaged cylinder head |
INSPECT the engine components. INSTALL new engine components as necessary. Refer to the appropriate Engine article for the procedure. TEST the system for normal operation after the repair. |
| Leaking oil cooler | INSPECT the oil cooler and seal for damage. INSTALL new components as necessary. Refer to the appropriate Engine article for the procedure. | |
| Coolant in oil | Leaking head gasket Damaged cylinder block Damaged cylinder head |
INSPECT the engine components. INSTALL new engine components as necessary. Refer to the appropriate Engine article for the procedure. TEST the system for normal operation after the repair. |
| Leaking oil cooler | INSPECT the oil cooler and seal for damage. INSTALL new components as necessary. Refer to the appropriate Engine article for the procedure. | |
| Insufficient power | Air intake system blockage Boost leaks or blockage Inoperative or damaged fuel system |
Refer to the appropriate Engine article for the procedure. Refer to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) . |
| Turbocharger damage | INSPECT the turbocharger. REFER to the Check for Free Rotation-- ON Vehicle. REFER to: Turbocharger . TEST the system for normal operation after the repair. | |
| Damaged exhaust or exhaust leaks at turbocharger housing or exhaust manifold | INSPECT for leaks. Leaks can be detected audibility or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as necessary. TEST the system for normal operation after the repair. | |
| Oil level too high | DRAIN oil to correct level. | |
| Incorrect engine oil | INSTALL correct specification engine oil. TEST the system for normal operation after the repair. | |
| Low oil pressure | CARRY OUT the Oil Pressure Test . Compare to specifications, repair as necessary. TEST the system for normal operation after the repair. | |
| Excessive accessory drive belt loading Inoperative or damaged cooling system |
Refer to the appropriate Engine article for the procedure. | |
| Damaged or plugged exhaust system | INSPECT exhaust system. TEST the system for normal operation after the repair. | |
| Incorrect tire size | REFER to: Suspension System . TEST the system for normal operation after the repair. | |
| Dragging brakes | REFER to: Brake System . TEST the system for normal operation after the repair. | |
| Slipping transmission | Refer to the appropriate Automatic Transmission article for the procedure. | |
| Compression leakage at valve seat Seized valve stem |
INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Weak or broken valve spring | INSTALL a new valve spring. TEST the system for normal operation after the repair. | |
| Worn or damaged camshaft | INSTALL a new camshaft. TEST the system for normal operation after the repair. | |
| Damaged head gasket | INSTALL a new head gasket. TEST the system for normal operation after the repair. | |
| Cracked or distorted cylinder head | INSTALL a new cylinder head. TEST the system for normal operation after the repair. | |
| Damaged, worn or sticking piston ring(s) | INSTALL a new piston ring(s). TEST the system for normal operation after the repair. | |
| Worn or damaged piston | INSTALL a new piston and piston pin. TEST the system for normal operation after the repair. | |
| Worn or damaged cylinder | INSPECT the cylinder for wear or damage. Repair as necessary. TEST the system for normal operation after the repair. | |
| Engine emits excessive black smoke (black/blue) | Clogged ACL (air cleaner) element | INSTALL a new ACL element. TEST the system for normal operation after the repair. |
| Incorrect type or grade of oil | DRAIN and FILL with specified oil. | |
| Blocked or restricted turbocharger oil drain pipe | INSPECT the turbocharger oil drain pipe. REPAIR as necessary. TEST the system for normal operation after the repair. | |
| Damaged/restricted or leaking turbocharger intake tube assembly | REPAIR or INSTALL a new tube as necessary. TEST the system for normal operation after the repair. | |
| Engine wear (piston rings, valve guides) | REPAIR as necessary. TEST the system for normal operation after the repair. | |
| Plugged crankcase ventilation system | Visually INSPECT the crankcase ventilation system. | |
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test. REFER to: Turbocharger . TEST the system for normal operation after the repair. | |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.