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ENGINE SYMPTOM TROUBLESHOOTING [L8, LF, L3]

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• Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.

Diagnostic Index

No. | TROUBLESHOOTING ITEM | DESCRIPTION | PAGE
--- | --- | --- | ---
1 | Melting of main or other fuses | - | (See NO.1 MELTING OF MAIN OR OTHER FUSES [L8, LF, L3].)
2 | MIL illuminates | The MIL is illuminated incorrectly. | (See NO.2 MIL ILLUMINATES [L8, LF, L3].)
3 | Will not crank | The starter does not work. | (See NO.3 WILL NOT CRANK [L8, LF, L3].)
4 | Hard to start/long crank/erratic start/erratic crank | The starter cranks the engine at normal speed but the engine requires excessive cranking time before starting. | (See NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [L8, LF, L3].)
5 | Engine stalls. | After start/at idle | The engine stops unexpectedly at idle and/or after start or both. | (See NO.5 ENGINE STALLS-AFTER START/AT IDLE [L8, LF, L3].)
6 | Cranks normally but will not start | The starter cranks engine at normal speed but the engine will not run. | (See NO.6 CRANKS NORMALLY BUT WILL NOT START [L8, LF, L3].)
7 | Slow return to idle | The engine takes more time than normal to return to idle speed. | (See NO.7 SLOW RETURN TO IDLE [L8, LF, L3].)
8 | Engine runs rough/rolling idle | The engine speed fluctuates between the specified idle speed and lower speed and the engine shakes excessively. | (See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [L8, LF, L3].)
9 | Fast idle/runs on | The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned off. | (See NO.9 FAST IDLE/RUNS ON [L8, LF, L3].)
10 | Low idle/stalls during deceleration | The engine stops unexpectedly at the beginning of deceleration or recovery from deceleration. | (See NO.10 LOW IDLE/STALLS DURING DECELERATION [L8, LF, L3].)
11 | Engine stalls/quits. | Acceleration/cruise | The engine stops unexpectedly at the beginning of acceleration or during acceleration. The engine stops unexpectedly while cruising. | (See NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [L8, LF, L3].)
Engine runs rough. | Acceleration/cruise | The engine speed fluctuates during acceleration or cruising.
Misses | Acceleration/cruise | The engine misses during acceleration or cruising.
Buck/jerk | Acceleration/cruise/ deceleration | The vehicle bucks/jerks during acceleration, cruising, or deceleration.
Hesitation/stumble | Acceleration | A momentary pause at the beginning of acceleration or during acceleration.
Surges | Acceleration/cruise | A momentary minor irregularity in engine output.
12 | Lack/loss of power | Acceleration/cruise | The performance is poor under load (such as power down when climbing hills). | (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L8, LF, L3].)
13 | Knocking/pinging/detonation | Acceleration/cruise | Sound is produced when the air/fuel mixture is ignited by something other than the spark plug (such as hot spot in combustion chamber). | (See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [L8, LF, L3].)
14 | Poor fuel economy | The fuel economy is unsatisfactory. | (See NO.14 POOR FUEL ECONOMY [L8, LF, L3].)
15 | Emission compliance | Fails emissions test. | (See NO.15 EMISSION COMPLIANCE [L8, LF, L3].)
16 | High oil consumption/leakage | The oil consumption is excessive. | (See NO.16 HIGH OIL CONSUMPTION/LEAKAGE [L8, LF, L3].)
17 | Cooling system concerns | Overheating | The engine runs at higher than normal temperature/overheats. | (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L8, LF, L3].)
18 | Cooling system concerns | Runs cold | The engine does not reach normal operating temperature. | (See NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [L8, LF, L3].)
19 | Exhaust smoke | Blue, black, or white smoke from exhaust system | (See NO.19 EXHAUST SMOKE [L8, LF, L3].)
20 | Fuel odor (in engine compartment) | Gasoline fuel smell or visible leakage | (See NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [L8, LF, L3].)
21 | Engine noise | Engine noise from under hood | (See NO.21 ENGINE NOISE [L8, LF, L3].)
22 | Vibration concerns (engine) | Vibration from under hood or driveline | (See NO.22 VIBRATION CONCERNS (ENGINE) [L8, LF, L3].)
23 | A/C does not work sufficiently. | The A/C compressor magnetic clutch does not engage when A/C is turned on. | (See NO.23 A/C DOES NOT WORK SUFFICIENTLY [L8, LF, L3].)
24 | A/C is always on or A/C compressor runs continuously. | The A/C compressor magnetic clutch does not disengage. | (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L8, LF, L3].)
25 | A/C does not cut off under wide open throttle conditions. | The A/C compressor magnetic clutch does not disengage under wide open throttle. | (See NO.25 A/C IS NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [L8, LF, L3].)
26 | Exhaust sulphur smell | Rotten egg smell (sulphur) from exhaust | (See NO.26 EXHAUST SULPHUR SMELL [L8, LF, L3].)
27 | Spark plug condition | An incorrect spark plug condition. | (See NO.27 SPARK PLUG CONDITION [L8, LF, L3] [EUROPEAN (L.H.D. U.K.) SPECS.].)
28 | ATX concerns | Upshift/downshift engagement | ATX concerns not related to engine performance. | (See AUTOMATIC TRANSAXLE SYMPTOM TROUBLESHOOTING [JA5AX-EL].)