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9 -12
ENGINE
TJ
DIAGNOSIS AND TESTING (Continued)
SERVICE DIAGNOSIS-PERFORMANCE
19409-91
CONDITION
POSSI"LE CAUSES
CORRECTION
ENGINE WILL NOT START
1 . Weak battery.
1 . Test battery specific gravity. Charge or replace as necessary.
2. 'Corroded or loose battery
2. Clean and tighten battery connections. Apply a coat of light
connections .
mineral grease to the terminals .
3. Faulty starter.
3. Refer to Group 8A, Battery/Starter/Charging System
Diagnostics.
4. Moisture on ignition wires and
4. Wipe wires and cap clean and dry.
distributor cop.
5. Faulty ignition cables .
5 . Replace any cracked or shorted cables .
6. Faulty coil or control unit .
6 . Test and replace, if necessary (refer to Group 8D, Ignition
System).
7. Incorrect spark plug gap.
7. Set gap (refer to Group 8D, Ignition System).
8 . Incorrect ignition timing .
8. Refer to Group 8D, Ignition System .
9.
Dirt
or water in fuel system .
9. Clean system and replace fuel filter.
10 . Faulty fuel pump .
10 . Install new fuel pump (refer to Group 14, Fuel System) .
11 . Faulty connectors for crankshaft
11 . Rebuild or replace the connectors .
or camshaft position sensors.
ENGINE STALLS OR
1 . Idle speed set too low.
1 . Refer to Group 14, Fuel System .
ROUGH IDLE
2. Idle mixture too lean or too rich .
2. Refer to Group 14, Fuel System .
3. Leak in intake manifold.
3 . Inspect intake manifold gasket and vacuum hoses. Replace, if
necessary (refer to Group 11, Exhaust System & Intake
Manifold).
4. Worn or burned distributor rotor.
4. Install new distributor rotor .
5. Incorrect ignition wiring .
5. Install correct wiring .
6. Faulty coil .
6. Test and replace, if necessary (refer to Group 8D, Ignition
System).
7. EGR valve leaking.
7. Test and replace, if necessary (refer to Group 25, Emissions
Control System) .
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Table of Contents
Troubleshooting
