EFI SYSTEM — Troubleshooting FI-15 SYMPTOM — ROUGH IDLING AND/OR MISSING CHECK DIAGNOSIS SYSTEM Check for output of diagnostic code. (See page FI-22) Normal code CHECK FOR VACUUM LEAKS IN AIR INTAKE LINE OK CHECK AIR FILTER ELEMENT OK CHECK IDLE SPEED STD: 650 rpm OK 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 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 COLD START INJECTOR (See page FI-43) OK CONTINUED ON PAGE FI-16 Malfunction code(s) Diagnostic code(s) (See page FI-25) BAD 1. Oil filler cap 2. Oil level gauge 3. Hose connections 4. PCV hoses 5. EGR system — EGR valve stays open BAD Element — clean or replace BAD ISC system (1) Wiring connection (2) ISC valve (3) ECU (test by substitution) NO Ignition system NO 1. Spark plug 2. Compression pressure Limit: 9.0 kg/cm² (128 psi, 883 kPa) at 250 rpm BAD 1. Cold start injector 2. Start injector time switch (See page FI-71)