SYMPTOM — MUFFLER EXPLOSION (AFTER FIRE) -Rich Fuel Mixture-Misfire CHECK DIAGNOSIS SYSTEM Check for output of diagnostic code. (See page FI-22) Normal code CHECK IGNITION TIMING 1. Short both terminals of the check connector. 2. Check ignition timing. STD: 10° BTDC (w/short terminals of the check connector) OK CHECK COLD START INJECTOR (See page FI-49) OK CHECK INJECTORS OK CHECK SPARK PLUGS Max. allowable gap: 1.4 mm (0.055 in.) Precaution: Never attempt to adjust gap on used platinum tipped spark plug. — Note — Check compression pressure if necessary. (See page EM-6) OK CHECK EFI ELECTRONIC CIRCUIT USING VOLT/OHMMETER Malfunction code(s) Diagnostic code(s) (See page FI-25) NO Ignition system (See page IG-2) BAD 1. Cold start injector 2. Start injector time switch (See page FI-71) BAD Injectors — leakage NO 1. Spark plug 2. Compression pressure Limit: 9.0 kgf/cm² (128 psi, 883 kPa) at 250 rpm BAD 1. Throttle position sensor 2. Injection signal (1) Injector wiring (2) Resistor (3) ECU 3. Oxygen sensor