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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I PREMIUM, ENG CD FB25BC, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (DIAGNOSTICS) (H4DO)GENERAL DIAGNOSTIC TABLEINSPECTIONENGINE
2014 Subaru Forester 2.5i Premium, Eng CD FB25BC, Automatic CVT Trans

General Diagnostic Table: Inspection: Engine

2014 Subaru Forester 2.5i Premium, Eng CD FB25BC, Automatic CVT TransSECTION Engine
NOTE: Malfunction of parts other than those listed is also possible. < Ref. to ENGINE TROUBLE IN GENERAL . >
Symptoms Faulty parts
1. Engine stalls during idling.
  1. Manifold absolute pressure sensor
  2. Mass air flow and intake air temperature sensor
  3. Ignition parts ((1))
  4. Engine coolant temperature sensor ((2))
  5. Crankshaft position sensor ((3))
  6. Camshaft position sensor ((3))
  7. Fuel injection parts ((4))
  8. Electronic throttle control
2. Rough idling
  1. Manifold absolute pressure sensor
  2. Mass air flow and intake air temperature sensor
  3. Engine coolant temperature sensor ((2))
  4. Ignition parts ((1))
  5. Air intake system ((5))
  6. Fuel injection parts ((4))
  7. Electronic throttle control
  8. Crankshaft position sensor ((3))
  9. Camshaft position sensor ((3))
  10. Oxygen sensor
  11. Fuel pump and fuel pump relay
  12. EGR control valve
3. Engine does not return to idle.
  1. Engine coolant temperature sensor
  2. Electronic throttle control
  3. Manifold absolute pressure sensor
  4. Mass air flow and intake air temperature sensor
  5. EGR control valve
  6. Accelerator pedal position sensor
  7. Engine oil temperature sensor
4. Poor acceleration
  1. Manifold absolute pressure sensor
  2. Mass air flow and intake air temperature sensor
  3. Electronic throttle control
  4. Fuel injection parts ((4))
  5. Fuel pump and fuel pump relay
  6. Engine coolant temperature sensor ((2))
  7. Crankshaft position sensor ((3))
  8. Camshaft position sensor ((3))
  9. Engine torque control signal circuit
  10. Ignition parts ((1))
  11. EGR control valve
  12. Accelerator pedal position sensor
  13. Engine oil temperature sensor
5. Engine stalls, hesitates, or sputters at acceleration.
  1. Manifold absolute pressure sensor
  2. Mass air flow and intake air temperature sensor
  3. Engine coolant temperature sensor ((2))
  4. Crankshaft position sensor ((3))
  5. Camshaft position sensor ((3))
  6. Purge control solenoid valve
  7. Fuel injection parts ((4))
  8. Electronic throttle control
  9. Fuel pump and fuel pump relay
  10. EGR control valve
6. Surging
  1. Mass air flow and intake air temperature sensor
  2. Manifold absolute pressure sensor
  3. Engine coolant temperature sensor ((2))
  4. Crankshaft position sensor ((3))
  5. Camshaft position sensor ((3))
  6. Fuel injection parts ((4))
  7. Electronic throttle control
  8. Fuel pump and fuel pump relay
  9. EGR control valve
7. Spark knock
  1. Mass air flow and intake air temperature sensor
  2. Manifold absolute pressure sensor
  3. Engine coolant temperature sensor
  4. Knock sensor
  5. Fuel injection parts ((4))
  6. Fuel pump and fuel pump relay
  7. EGR control valve
8. After burning in exhaust system
  1. Mass air flow and intake air temperature sensor
  2. Manifold absolute pressure sensor
  3. Engine coolant temperature sensor ((2))
  4. Fuel injection parts ((4))
  5. Fuel pump and fuel pump relay
(1) Check ignition coil and spark plug.
(2) Indicate the symptom occurring only in cold temperatures.
(3) Ensure the secure installation.
(4) Check fuel injector and fuel filter.
(5) Inspect air leak in air intake system.
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.