Dodge RAM TRUCK 1500 1995 Service Manual page 852

ENGINE
DIAGN&&8&-GASOLINE—PERFORMANCE
CONDITION
POSSIBLE C A U S E S
CORRECTION
ENGINE WILL NOT START
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. Test battery specific gravity. Charge or replace os 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 any cracked or shorted cables.
6 . Test and replace, if necessary (refer to Group 8D, Ignition
System).
7. Set gap {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.
ENGINE STALLS OR
ROUGH IDE
1. Idle speed set too low.
2. idle mixture too lean or too rich.
3. Leak in intake manifold.
4. Worn or burned distributor rotor.
5. Incorrect ignition wiring.
6. Faulty coil.
7. EGR valve leaking.
8. Incorrect cam timing.
1. Refer to Group 14, Fuel System.
2. Refer to Group 14, Fuel System.
3. inspect intake manifold gasket and vacuum hoses. Replace, if
necessary (refer to Group 11, Exhaust System & Intake
Man i fold).
4. Install new distributor rotor.
5 . Install correct wiring.
6. Test and replace, if necessary (refer to Group 8D, Ignition
System).
7. Test and replace, if necessary {refer to Group 25, Emissions
Control System).
8. Refer to Timing Belt Service.
ENGINE LOSS OF POWER
1. Incorrect ignition timing. -
2. Worn or burned distributor rotor.
3. Worn distributor shaft.
4. Dirty or incorrectly gapped spark
plugs.
5. Dirt or water in fuel system.
6. Faulty fuel pump.
7. Incorrect valve timing.
8. Blown cylinder head gasket.
9. Low compression.
10. Burned, warped or pitted valves.
11. Plugged or restricted exhaust
system.
12. Faulty ignition cables.
13. Faulty coil.
14. Incorrect cam timing.
1. Refer to Group 8D, Ignition System.
2. install new distributor rotor.
3. Remove and repair distributor (refer to Group 8D, Ignition
System).
4. Clean plugs and set gap (refer to Group 8D, Ignition System).
5 . Clean system and replace fuel filter.
6 . Install new fuel pump.
7. Correct valve timing.
8. Install new cylinder head gasket.
9. Test compression of each cylinder.
10. Install new valves.
11. Install new parts, as necessary.
12. Replace any cracked or shorted cables.
13. Test and replace, as necessary (refer to Group 8D, Ignition
System).
14. Refer to Timing Belt Service.
ENGINE MISSES O N
ACCELERATION
1. Dirty or gap set too wide in spark
plug.
2. Incorrect ignition timing.
3. Dirt in fuel system.
4. Burned, warped or pitted valves.
5. Faulty coil.
6. Incorrect cam timing.
1. Clean spark plugs and set gap (refer to Group 8D, Ignition
System).
2. Refer to Group 8D, Ignition System.
3. Clean fuel system.
4. Install new valves.
5 . Test and replace, if necessary, (refer to Group 8D, Ignition
„ System).
6. f?«fe* r r. Timing Belt Service.
ENGINE MISSES AT HIGH
SPEED
1. Dirty or gap set too wide in spark
plug.
2. Worn distributor shaft.
3. Worn or burned distributor rotor.
4. Faulty coil.
5. Incorrect ignition timing.
6. Dirty injector in throttle body.
7. Dirt or water in fuel system.
8. Incorrect cam timing.
1. Clean spark plugs and set gap (refer to Group 8D, Ignition
System).
2. Remove and repair distributor (refer to Group 8D, Ignition
System).
3. Install new distributor rotor.
4. Test and replace, as necessary {refer to Group 8D, Ignition
System).
5. Refer to Group 8D, Ignition System.
6. Clean injector.
7. Clean system and replace fuel filter.
8. Refer to Timing Belt Service.
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