Service Diagnosis—Gasoline Engines - Dodge 2000 DURANGO Service Manual

9 - 142 5.9L ENGINE
DIAGNOSIS AND TESTING (Continued)
SERVICE DIAGNOSIS—GASOLINE ENGINES
PERFORMANCE DIAGNOSIS CHART—GASOLINE ENGINES
CONDITION
ENGINE WILL 1. Weak or dead battery
NOT CRANK
2. Corroded or loose battery
connections
3. Faulty starter or related circuit(s)
4. Seized accessory drive
component
5. Engine internal mechanical
failure or hydro-static lock
ENGINE CRANKS 1. No spark
BUT WILL NOT
START
2. No fuel
3. Low or no engine compression
ENGINE LOSS OF 1. Worn or burned distributor rotor
POWER
2. Worn distributor shaft
3. Worn or incorrect gapped spark
plugs
4. Dirt or water in fuel system
5. Faulty fuel pump
6. Incorrect valve timing
7. Blown cylinder head gasket
8. Low compression
9. Burned, warped, or pitted valves
10. Plugged or restricted exhaust
system
11. Faulty ignition cables
12. Faulty ignition coil
ENGINE STALLS 1. Carbon build-up on throttle plate
OR ROUGH IDLE
2. Engine idle speed too low
POSSIBLE CAUSES CORRECTION
1. Charge/Replace Battery. Refer to Group 8A,
Battery, for correct procedures. Check charging
system. Refer to Group 8C, Charging Systems, for
correct procedures.
2. Clean/tighten suspect battery/starter connections
3. Check starting system. Refer to Group 8B,
Starting Systems, for correct diagnostics/procedures
4. Remove accessory drive belt and attempt to start
engine. If engine starts, repair/replace seized
component.
5. Refer to Group 9, Engine, for correct diagnostics/
procedures
1. Check for spark. Refer to Group 8D, Ignition
System, for correct procedures.
2. Perform fuel pressure test, and if necessary,
inspect fuel injector(s) and driver circuits. Refer to
Group 14, Fuel System, for correct procedures.
3. Perform cylinder compression pressure test. Refer
to Group 9, Engine, for correct procedures.
1. Install new distributor rotor
2. Remove and repair distributor (Refer to Group 8D,
Ignition System
3. Clean plugs and set gap. (Refer to Group 8D,
Ignition System)
4. Clean system and replace fuel filter
5. Install new fuel pump
6. Correct valve timing
7. Install new cylinder head gasket
8. Test cylinder compression
9. Install/Reface valves as necessary
10. Install new parts as necessary
11. Replace any cracked or shorted cables
12. Test and replace, as necessary (Refer to Group
8D, Ignition System)
1. Remove throttle body and de-carbon. (Refer to
Group 14 for correct procedures)
2. Check Idle Air Control circuit. (Refer to Group 14,
Fuel System)
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