FI/EFI System — Symptom — Muffler Explosion (After Fire) -Rich Fuel Mixture-Misfire, page 20

FI-20

EFI SYSTEM — Troubleshooting

SYMPTOM — MUFFLER EXPLOSION (AFTER FIRE)
-Rich Fuel Mixture-Misfire

CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page FI-23)

Malfunction
code(s)

Diagnostic code(s) (See page FI-26)

Normal code

CHECK IGNITION TIMING
1. Connect terminals TE1 and E1 of the
check connector.
2. Check ignition timing.
STD: 10° BTDC @ idle
[w/ connect terminals TE1 and E1]

NO

Adjust ignition timing (See page IG-20)

OK

CHECK COLD START INJECTOR
(See page FI-77)

BAD

1. Cold start injector
2. Cold start injector time switch
(See page FI-112)

OK

CHECK INJECTORS

BAD

Injectors — Leakage

OK

CHECK SPARK PLUGS
Plug gap: 7M-GE 1.1 mm (0.043 in.)
7M-GTE 0.8 mm (0.031 in.)

— HINT —
Check compression pressure and valve
clearance if necessary.

NO

1. Spark plugs
2. Compression pressure
Minimum: 9.0 kg/cm²
(128 psi, 883 kPa)
at 250 rpm

3. Valve clearance
Standard: IN 0.15 ~ 0.25 mm
(0.006 ~ 0.010 in.)
EX 0.20 ~ 0.30 mm
(0.008 ~ 0.012 in.)

OK

CHECK EFI ELECTRONIC CIRCUIT
USING VOLT/OHMMETER
(See pages FI-30, 49)

BAD

1. Throttle position sensor
2. Injection signal circuit
(1) Injector wiring
(2) Resistor (7M-GTE)
(3) ECU
3. Oxygen sensor(s)