NO.3 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [WLT-1, WLT-2]

id010396912300

3
Hard to start/long crank/erratic start/erratic crank
DESCRIPTION
•  The starter cranks the engine at normal speed but the engine requires excessive cranking time before starting.
•  The battery is in normal condition.
POSSIBLE CAUSE
•  Poor fuel quality
•  Starting system malfunction
•  Intake-air system restriction
•  Incorrect idle speed
•  Engine overheating
•  Glow system malfunction
•  Fuel filter clogging
•  Fuel line restriction
•  Fuel leakage
•  Exhaust system restriction
•  Incorrect fuel injection timing
•  Injection pump malfunction
•  Injection nozzle malfunction
•  Low engine compression

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Inspect for the following:
―  Fuel quality including water contamination
―  Loose bands on intake-air system
―  Fuel line/fuel filter clogging
―  Intake-air system restriction
•  Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
•  Is the engine overheating?
Yes
Go to symptom troubleshooting “NO.13 COOLING SYSTEM CONCERNS-OVERHEATING.”
No
Go to the next step.
3
•  Does the engine start normally after warm-up?
Yes
Inspect the glow plug and the glow plug relay.
(See GLOW PLUG INSPECTION [WLT-1, WLT-2])
(See GLOW PLUG RELAY INSPECTION [WLT-1, WLT-2].)
Replace any malfunctioning part if necessary.
If the glow system is normal, go to the next step.
No
Go to the next step.
4
•  Is the idle speed correct?
Yes
Go to the next step.
No
Adjust idle speed.
(See ENGINE TUNE-UP [WLT-1, WLT-2])
5
•  Is there any restriction in the exhaust system?
Yes
Repair or replace if necessary.
No
Go to the next step.
6
•  Inspect for fuel leakage from the fuel pipe.
•  Is any fuel leakage found on the fuel pipe?
Yes
Repair or replace if necessary.
No
Go to the next step.
7
•  Measure engine compression.
•  Is compression normal?
Yes
Go to Step 9.
No
Go to the next step.
8
•  Inspect timing belt for the following:
―  Chipping of gear teeth
―  Breakage, damage or cracks
―  Low tension
•  Is the timing belt normal?
Yes
Inspect for the following:
•  Burnt valve
•  Worn piston, piston ring or cylinder
•  Damaged cylinder head gasket
•  Damaged valve seat
•  Worn valve stem or valve guide
Repair or replace if necessary.
No
If the timing is incorrect, adjust the timing
If the timing belt is not normal, replace the timing belt.
9
•  Inspect injection timing.
•  Is injection timing normal?
Yes
Go to the next step.
No
Inspect the TCV.
(See TIMER CONTROL VALVE (TCV) INSPECTION [WLT-1, WLT-2])
If the TCV is normal, adjust the injection timing.
10
•  Remove and inspect the injection nozzle for the following:
―  Clogged nozzle
―  Incorrect valve opening pressure
―  Malfunctioning nozzle gasket
•  Is the injection nozzle normal?
Yes
Remove the FIP.
Inspect the FIP.
If the FIP is normal, inspect fuel line for clogging.
No
Clogged nozzle or seized needle valve:
•  Disassemble and clean or replace the injection nozzle.
Incorrect valve opening pressure:
•  Adjust injection nozzle opening pressure.
Malfunctioning nozzle gasket:
•  Replace nozzle gasket.
11
•  Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.