Service Diagnosis—Performance - Dodge 2000 DURANGO Service Manual

9 - 8 4.7L ENGINE
DIAGNOSIS AND TESTING (Continued)
SERVICE DIAGNOSIS—PERFORMANCE
CONDITION
ENGINE WILL NOT START
ENGINE STALLS OR ROUGH IDLE
POSSIBLE CAUSE
1. Weak battery
2. Corroded or loose battery
connections.
3. Faulty starter.
4. Moisture on ignition wires and
distributor cap.
5. Faulty ignition cables.
6. Faulty coil or control unit.
7. Incorrect spark plug gap.
8. Incorrect ignition timing.
9. Dirt or water in fuel system.
10. Faulty fuel pump, relay or
wiring.
1. Idle speed set to low.
2. Idle mixture to lean or to rich.
3. Vacuum leak.
4. Worn or burned distributor rotor.
5. Incorrect ignition wiring.
6. Faulty coil.
7. EGR valve leaking.
8. Incorrect cam timing.
CORRECTION
1. Charge or replace as necessary.
2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Refer to Group 8A, Battery/
Starter/ Charging System
Diagnostics.
4. Wipe wires and cap clean and
dry.
5. Replace as necessary.
6. Refer to Group 8D, Ignition
System.
7. Refer to Group 8D, Ignition
System.
8. Refer to Group 8D, Ignition
System.
9. Clean system and replace fuel
filter.
10. Refer to Group 14, Fuel System.
1. Refer to Group 14, Fuel System.
2. Refer to Group 14, Fuel System.
3. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
4. Replace distributor rotor.
5. Install correct wiring.
6. Refer to Group 8D, Ignition
System.
7. Refer to Group 25, Emissions
Control System.
8. Refer to Valve Timing in this
section.
DN