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

BME010300103242

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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual.
(See BEFORE SERVICE PRECAUTION [L3].)
(See AFTER SERVICE PRECAUTION [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 the 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 normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the WDS or equivalent to the DLC-2.
Retrieve any KOEO and KOER DTC.
Is any KOEO or KOER DTC displayed?
Yes

DTC is displayed:

Go to the applicable DTC inspection.
No

No DTC is displayed:

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

Spark plug is wet or covered with carbon:

Inspect for fuel leakage from the fuel injector.

Spark plug is grayish white:

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

Specification

0.5-1.9 mm {0.020-0.75 in}

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

Zero or low:

Inspect for clogged fuel line.
If normal, replace the fuel pump unit.

High:

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