NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [L3]

BME010300000W06

4

HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK

DESCRIPTION

• Starter cranks engine at normal speed but engine requires excessive cranking time before starting.
• Battery is in normal condition.

POSSIBLE CAUSE

• Spark leakage from high-tension leads
• Vacuum leakage
• Poor fuel quality
• Starting system malfunction
• Spark plug malfunction
• Air leakage from intake-air system
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• Improper air/fuel mixture ratio control
• Air cleaner restriction
• IAC valve malfunction
• PCV valve malfunction
• Inadequate fuel pressure
• Purge solenoid valve malfunction
• MAF sensor contamination
• Restriction in exhaust system
• EGR valve malfunction
• Pressure regulator malfunction
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
(See BEFORE REPAIR PROCEDURE [L3].)
(See AFTER REPAIR PROCEDURE [L3].)
Caution
• Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1
Inspect for following:
• Vacuum leakage
• Proper fuel quality (e.g. proper octane, contamination, winter/summer blend)
• Loose bands on intake-air system
• Cracks on intake-air system parts
• Air cleaner restriction
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
2
Connect WDS or equivalent to DLC-2.
Retrieve any KOEO and KOER DTC.
Is any KOEO or KOER DTC displayed?
Yes

DTC is displayed:

Go to appropriate DTC test.
No

No DTC is displayed:

Go to next step.
3
Is engine overheating?
Yes
Go to symptom troubleshooting "No.17 Cooling system concerns - Overheating".
No
Go to next step.
4
Inspect for cracks on high-tension leads.
Are there any cracks on high-tension leads?
Yes
Repair suspected high-tension leads.
No
Go to next step.
5
Inspect spark plug conditions.
Is spark plug wet, covered with carbon or grayish white?
Yes

Spark plug is wet or covered with carbon:

Inspect for fuel leakage from fuel injector.

Spark plug is grayish white:

Inspect for clogged fuel injector.
No
Install spark plugs on original cylinders.
Go to next step.
6
Visually inspect CKP sensor and teeth of crankshaft pulley.
Are CKP sensor and teeth of crankshaft pulley okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
7
Measure gap between CKP sensor and teeth of crankshaft pulley.

Specification

0.5-1.9 mm {0.020-0.75 in}

Is gap within specification?
Yes
Go to next step.
No
Adjust CKP sensor.
8
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
9
Install fuel pressure gauge between fuel pipe and fuel distributor.
Connect a jumper wire between F/P terminal at DLC-2 in engine compartment and GND.
Turn ignition switch to ON position.
Is fuel line pressure correct with ignition switch ON?
Yes
Go to next step.
No

Zero or low:

Inspect for clogged fuel line.
If okay, replace fuel pump unit.

High:

Replace fuel pump unit.
10
Is fuel line pressure held after ignition switch is turned off?
Yes
Go to next step.
No
Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
11
Disconnect a vacuum hose from purge solenoid valve and plug opening end of vacuum hose. Attempt to start engine.
Is starting condition improved?
Yes
Inspect if purge solenoid valve sticks open.
No
Go to next step.
12
Inspect MAF sensor for contamination.
Is there any contamination?
Yes
Replace MAF sensor.
No
Go to next step.
13
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to next step.
14
Inspect engine condition while tapping EGR valve housing. Does engine condition improve?
Yes
Replace EGR valve.
No
Go to next step.
15
Inspect starting system.
Is starting system normal?
Yes
Inspect for loose connectors or poor terminal contact. If okay, remove EGR valve and visually inspect for mechanically stuck EGR valve.
No
Repair or replace components as required.
16
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.