Chrysler New Yorker. Manual - part 232
ENGINE DIAGNOSIS—PERFORMANCE
CONDITION
POSSIBLE CAUSE
CORRECTION
ENGINE WILL NOT
START
1. Weak battery.
1. Test battery. Charge or replace as necessary.
Refer to Group 8A, Battery.
2. Corroded or loose battery
connections.
2. Clean and tighten battery connections. Apply a
coat of light mineral grease to terminals.
3. Faulty starter.
3. Test starting system. Refer to Group 8B, Starting.
4. Faulty coil(s) or control unit.
4. Test and replace as needed. Refer to Group 8D,
Ignition System.
5. Incorrect spark plug gap.
5. Set gap. Refer to Group 8D, Ignition System.
6. Contamination in fuel system.
6. Clean system and replace fuel filter.
7. Faulty fuel pump.
7. Test fuel pump and replace as needed. Refer to
Group 14, Fuel System.
8. Incorrect engine timing.
8. Check for a skipped timing belt/chain or a loose
camshaft sprocket (3.2/3.5L).
ENGINE STALLS OR
IDLES ROUGH
1. Idle speed too low.
1. Test minimum air flow. Refer to Group 14, Fuel
System.
2. Incorrect fuel mixture.
2. Refer to Group 14, Fuel System.
3. Intake manifold leakage.
3. Inspect intake manifold, manifold gasket, and
vacuum hoses. Refer to Group 11, Exhaust System
and Intake Manifold.
4. Faulty coil(s).
4. Test and replace as necessary. Refer to Group 8D,
Ignition System.
ENGINE LOSS OF
POWER
1. Dirty or incorrectly gapped plugs.
1. Clean plugs and set gap. Refer to Group 8D,
Ignition System.
2. Contamination in fuel system.
2. Clean system and replace fuel filter.
3. Faulty fuel pump.
3. Test and replace as necessary. Refer to Group 14,
Fuel System.
4. Incorrect valve timing.
4. Correct valve timing.
5. Leaking cylinder head gasket.
5. Replace cylinder head gasket.
6. Low compression.
6. Test compression of each cylinder.
7. Burned, warped, or pitted valves.
7. Replace valves.
8. Plugged or restricted exhaust
system.
8. Install new parts, as necessary.
9. Faulty coil(s).
9. Test and replace as necessary. Refer to Group 8D,
Ignition System.
ENGINE MISSES ON
ACCELERATION
1. Dirty or incorrectly gapped spark
plugs.
1. Clean spark plugs and set gap. Refer to Group
8D, Ignition System.
2. Contamination in Fuel System.
2. Clean fuel system and replace fuel filter.
3. Burned, warped, or pitted valves.
3. Replace valves.
4. Faulty coil(s).
4. Test and replace as necessary. Refer to Group 8D,
Ignition System.
ENGINE MISSES AT HIGH
SPEED
1. Dirty or incorrect spark plug gap.
1. Clean spark plugs and set gap. Refer to Group
8D, Ignition System.
2. Faulty coil(s).
2. Test and replace as necessary. Refer to Group 8D,
Ignition System.
3. Dirty fuel injector(s).
Test and replace as necessary. Refer to Group 14,
Fuel System.
4. Contamination in fuel system.
4. Clean system and replace fuel filter.
300M
ENGINE
9 - 11
DIAGNOSIS AND TESTING (Continued)