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NO.4 HARD START/LONG CRANK/ERRATIC START/ERRATIC CRANK [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010300103209

4 | Hard start/long crank/erratic start/erratic crank
DESCRIPTION | • Starter cranks engine at normal speed but engine requires excessive cranking time before start. • 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
• 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

  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 [AJ].)
  (See AFTER SERVICE PRECAUTION [AJ].)

Diagnostic procedure

STEP | INSPECTION | 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. • Turn the ignition switch to the ON position. • Retrieve any DTCs. • Is "PASSED" displayed? | Yes | No DTC is displayed: • Go to the next step.
No | DTC is displayed: • Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
3 | • Is the engine overheating? | Yes | Go to the flowchart "No.17 Cooling system concerns-Overheating".
No | Go to the next step.
4 | • Inspect for cracks on high-tension leads • Is there crack on high-tension leads? | Yes | Repair the high-tension lead.
No | Go to the next step.
5 | • Inspect 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 | • Remove and shake the PCV valve. • Does the PCV valve rattle? | Yes | Go to the next step.
No | Replace the PCV valve.
8 | • Install a fuel pressure gauge between pulsation damper and fuel distributor. • Connect a jumper wire between F/P terminal at DLC in engine compartment and GND. (See AFTER SERVICE PRECAUTION [AJ].) • Turn the ignition switch to the ON position (Engine off).
• Is fuel line pressure correct?
(See FUEL LINE PRESSURE INSPECTION [AJ].)
Yes
Go to the next step.
No | Zero or low: • Inspect fuel pump circuit. • Inspect for open fuel pump relief valve. • Inspect for fuel leakage inside pressure regulator. • Inspect for clogged main fuel line. High:
• Inspect pressure regulator for high pressure cause.
• Inspect for clogged fuel return line.
9 | • Is fuel line pressure held after the ignition switch is turned off? | Yes | Go to the next step.
No | Inspect the pressure regulator diaphragm condition. • If condition is normal, inspect the fuel injector. • If condition is not normal, replace the pressure regulator.
10 | • Disconnect the vacuum hose from the pressure regulator and the plug hose. • Start the engine. • Does fuel line pressure remain within 0 kPa {0.21 kgf/cm 2, 3.0 psi} while driving the vehicle? | Yes | Go to the next step.
No | Inspect for the clogged fuel filter.
11 | • Connect the vacuum hose to the pressure regulator. • Install the vacuum gauge to the intake manifold. • Start the engine. • Does the fuel pressure gauge reading increase as the vacuum gauge reading decreases and/or the fuel pressure gauge reading decrease as the vacuum gauge reading increases? | Yes | Go to the next step.
No | Connect the vacuum pump to the pressure regulator. Start the engine. Inspect if the fuel pressure gauge reading changes as vacuum changes. • If it changes, inspect vacuum line. • If it does not change, replace the pressure regulator.
12 | • Disconnect vacuum hose from the purge solenoid valve and plug opening end of the vacuum hose. • Attempt to start the engine. • Is starting condition improved? | Yes | Inspect if the purge solenoid valve sticks open.
No | Go to the next step.
13 | • Inspect the MAF sensor for contamination. • Is there contamination? | Yes | Replace the MAF sensor.
No | Go to the next step.
14 | • Inspect for restriction in the exhaust system. • Is there restriction? | Yes | Inspect the exhaust system.
No | Go to the next step.
15 | • 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.
16 | • Inspect the starting system. (See STARTER INSPECTION [L3, AJ].) • Is the starting system normal? | Yes | Inspect for loose connectors or poor terminal contact. • If normal, remove the EGR valve and visually inspect for the mechanically stuck EGR valve.
No | Repair or replace components as required.
17 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram the PCM.