Diagnostic Procedure 20 — Backfire through the Intake / Diagnostic Procedure 21 — Backfire through the Exhaust
EF & EC-462flowchartDiagnostic Procedure 20 — Backfire through the Intake
1
CHECK SPARK PLUGS. Remove the spark plugs and check for fouling, etc.
N.G.
Repair or replace spark plug(s).
O.K.
2
CHECK INTAKE AIR LEAK. When pinching blow-by hose (lowering the blow-by air supply), does the engine speed rise?
Yes
Discover air leak location and repair.
No
3
CHECK FOR INTAKE VALVE DEPOSITS. If there are deposits on intake valves, remove them.
INSPECTION END
Diagnostic Procedure 21 — Backfire through the Exhaust
1
CHECK ENGINE TEMPERATURE SENSOR. Check engine temperature sensor and its circuit. (See page EF & EC-476.)
N.G.
Replace or repair.
O.K.
INSPECTION END