Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 1469

The 2.7 Liter (167 Cubic Inches) 60 degree V-6
engine is a double overhead camshaft design with
hydraulic lifters and four valves per cylinder. The
engine does not have provisions for a free wheeling
valve train.

The cylinders are numbered from front to rear, with
the right bank odd numbered, and the left bank even
numbered. The firing order is 1–2–3–4–5–6.

ENGINE - 2.7L DOHC - SERVICE INFORMATION

9 - 1901

The engine identification number is located on the rear
of the cylinder block just below the left cylinder head

DIAGNOSIS AND TESTING

ENGINE DIAGNOSIS - INTRODUCTION

Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine main-
tenance.

These malfunctions may be classified as either mechanical (e.g., a strange noise), or performance (e.g., engine
idles rough and stalls).

Refer to Service Diagnosis—Mechanical Chart and Service Diagnosis—Performance Chart, for possible causes and
corrections of malfunctions. Refer to FUEL SYSTEM for the fuel system diagnosis.

Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that cannot be iso-
lated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the
following:

•

Cylinder Compression Pressure Test

•

Cylinder Combustion Pressure Leakage Test

•

Cylinder Head Gasket Failure Diagnosis

•

Intake Manifold Leakage Diagnosis

•

Lash Adjuster (Tappet) Noise Diagnosis

•

Engine Oil Leak Inspection

9 - 1902

ENGINE - 2.7L DOHC - SERVICE INFORMATION

ENGINE DIAGNOSIS - PERFORMANCE

CONDITION

POSSIBLE CAUSE

CORRECTION

ENGINE WILL NOT START

1. Weak battery.

1. Test battery. Charge or replace as
necessary. (Refer to 8 -
ELECTRICAL/BATTERY SYSTEM/
BATTERY - DESCRIPTION)

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 8 -
ELECTRICAL/STARTING -
DIAGNOSIS AND TESTING)

4. Faulty coil(s) or control unit.

4. Test and replace as needed.
(Refer to Appropriate Diagnostic
Information)

5. Incorrect spark plug gap.

5. Check and adjust gap as needed.

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 Appropriate
Diagnostic Information)

8. Incorrect engine timing.

8. Check for a skipped timing chain.

ENGINE STALLS OR IDLES
ROUGH

1. Idle speed too low.

1. Test minimum air flow. (Refer to
Appropriate Diagnostic Information)

2. Incorrect fuel mixture.

2. (Refer to Appropriate Diagnostic
Information)

3. Intake manifold leakage.

3. Inspect intake manifold gasket,
manifold, and vacuum hoses.

4. Faulty coil(s).

4. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)

ENGINE LOSS OF POWER

1. Dirty or incorrectly gapped plugs.

1. Set gap as needed or replace
plug(s).

2. Contamination in fuel system.

2. Clean system and replace fuel
filter.

3. Faulty fuel pump.

3. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)

4. Incorrect valve timing.

4. Correct valve timing as needed.

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. Check exhaust system restriction.
Replace parts, as necessary.

9. Faulty coil(s).

9. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)

ENGINE - 2.7L DOHC - SERVICE INFORMATION

9 - 1903

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