TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 25: Backfire through the exhaust
EF & EC-63flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 25 — Backfire — through the exhaust
Possible Causes Matrix — Symptom 25: Backfire through the exhaust
SPECIFICATIONS
Possible CausesMixture ratio (too rich)
1O
2O
3
4
FUEL SYSTEM
Possible CausesInjectors (fuel leaks)
1
2O
3
4
IGNITION SYSTEM
Possible Causes(missing)
1
2
3
4O
INTAKE SYSTEM
Possible CausesAir cleaner element (clogged)
1O
2
3
4
CONTROL SYSTEM
Possible CausesIdle switch (remaining OFF)
1
2
3O
4
SERVICE PROCEDURE
Service Procedure Flowchart — Symptom 25
1
CHECK 1 — AIR CLEANER ELEMENT
Check air cleaner element for clogging. [SEF320G]
N.G.
Replace the element.
O.K.
2
APPLY 2 — PRESSURE
Apply pressure to pressure regulator after disconnecting vacuum hose, and try to drive. [SEF291G]
Improved
Improved — Check idle mixture ratio. [See page EF & EC-25.]
Not Improved
3
PERFORM 3 — Self-diagnosis Mode IV
Perform self-diagnosis Mode IV (for idle switch). [SEF285G]
N.G.
Check idle switch and/or its circuit. [See page EF & EC-94.]
O.K.
4
PERFORM 4 — Self-diagnosis Mode V
Perform self-diagnosis Mode V (for ignition signal). [SEF285G]
N.G.
Check the malfunctioning part and/or circuit. [See page EF & EC-90 (ignition signal).]