Dodge Nitro. Manual - part 2

 

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Dodge Nitro. Manual - part 2

 

 

ENGINE PERFORMANCE DIAGNOSTIC TABLE 

CONDITION 

POSSIBLE CAUSES 

CORRECTION 

OIL LEAKS

1. Gaskets and O-Rings.

-

(a) Misaligned or damaged.

(a) Replace as necessary.

(b) Loose fasteners, broken or 
porous metal parts.

(b) Tighten fasteners, Repair or 
replace metal parts.

2. Crankshaft rear seal

2. Replace as necessary. See 
REMOVAL.

3. Crankshaft seal flange. 
Scratched, nicked or grooved.

3. Polish or replace crankshaft.

4. Oil pan flange cracked.

4. Replace oil pan. See 
REMOVAL.

5. Timing chain cover seal 
damaged.

5. Re-seal timing cover.

6. Scratched or damaged vibration 
damper hub.

6. Polish or replace damper.

OIL PRESSURE DROP

1. Low oil level.

1. Check and correct oil level.

2. Faulty oil pressure sending unit. 2. Replace sending unit. See 

REMOVAL.

3. Low oil pressure.

3. Check oil pump and bearing 
clearance.

4. Clogged oil filter.

4. Replace oil filter. See 
REMOVAL.

5. Worn oil pump.

5. Replace oil pump. See 
REMOVAL.

6. Thin or diluted oil.

6. Change oil and filter.

7. Excessive bearing clearance.

7. Replace as necessary.

8. Oil pump relief valve stuck.

8. Replace oil pump. See 
REMOVAL.

9. Oil pick up tube loose, damaged 
or clogged.

9. Replace as necessary.

OIL PUMPING AT RINGS; 

SPARK PLUGS FOULING

1. Worn or damaged rings.

1. Hone cylinder bores and replace 
rings.

2. Carbon in oil ring slots.

2. Replace rings. See 
STANDARD PROCEDURE.

3. Incorrect ring size installed.

3. Replace rings. See 
STANDARD PROCEDURE.

4. Worn valve guides.

4. Ream guides and replace 
valves. See STANDARD 
PROCEDURE
.

5. Leaking valve guide seals.

5. Replace valve guide seals.

CONDITION 

POSSIBLE 

CORRECTION 

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

CAUSE 

ENGINE WILL 

NOT START

1. Weak battery

1. Charge or replace 
as necessary.

2. Corroded or loose 
battery connections.

2. Clean and tighten 
battery connections. 
Apply a coat of 
light mineral grease 
to the terminals.

3. Faulty starter.

3. Refer to 
DIAGNOSIS AND 
TESTING
 .

4. Faulty coil or 
control unit.

4. Refer to 
REMOVAL .

5. Incorrect spark 
plug gap.

5.

6. Incorrect right 
bank cam timing.

6. Refer to engine 
timing in this 
article.

7. Dirt or water in 
fuel system.

7. Clean system and 
replace fuel filter.

8. Faulty fuel pump, 
relay or wiring.

8. Repair or replace 
as necessary.

9. Faulty cam or 
crank sensor

9. Refer to Ignition 
system.

ENGINE STALLS 
OR ROUGH IDLE

1. Vacuum leak.

1. Inspect intake 
manifold and 
vacuum hoses, 
repair or replace as 
necessary.

-

2. Faulty crank 
position sensor

2. Replace crank 
position sensor.

3. Faulty coil.

3. Refer to 
REMOVAL .

4. Incorrect cam 
timing.

4. See STANDARD 
PROCEDURE
.

ENGINE LOSS OF 
POWER

1. Dirty or 
incorrectly gapped 
spark plugs.

1. Refer to SPARK 
PLUG
 

2. Dirt or water in 
fuel system.

2. Clean system and 
replace fuel filter.

3. Faulty fuel pump. 3. (Refer to PUMP-

FUEL ).

4. Blown cylinder 
head gasket.

4. Replace cylinder 
head gasket.

5. Low 

5. See 

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

STANDARD PROCEDURE 

ENGINE GASKET SURFACE PREPARATION 

compression.

DIAGNOSIS AND 
TESTING
, repair 
as necessary.

6. Burned, warped 
or pitted valves.

6. Replace as 
necessary.

7. Plugged or 
restricted exhaust 
system.

7. Inspect and 
replace as 
necessary.

8. Faulty coil.

8. Refer to 
REMOVAL .

9. Incorrect cam 
timing.

9. Refer to Engine 
Timing in this 
article.

ENGINE MISSES 
ON 
ACCELERATION

1. Spark plugs dirty 
or incorrectly 
gapped.

1. (Refer to SPARK 
PLUG
 ).

2. Dirt in fuel 
system.

2. Clean fuel 
system.

3. Burned, warped 
or pitted valves.

3. Replace as 
necessary.

4. Faulty coil.

4. Refer to 
REMOVAL .

ENGINE MISSES 
AT HIGH SPEED

1. Spark plugs dirty 
or incorrectly 
gapped.

1. (Refer to SPARK 
PLUG
 ).

2. Faulty coil.

2. Refer to 
REMOVAL .

3. Dirt or water in 
fuel system.

3. Clean system and 
replace fuel filter.

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

Fig. 2: Proper Tool Usage for Surface Preparation 
Courtesy of CHRYSLER LLC 

To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of 
aluminum engine components and multi-layer steel cylinder head gaskets. 

Never use the following to clean gasket surfaces: 

Metal scraper (3).  

Abrasive pad (1) or paper to clean cylinder block and head.  

High speed power tool (1) with an abrasive pad or a wire brush. 

1 - ABRASIVE PAD
2 - 3M ROLOC™ BRISTLE DISC
3 - PLASTIC/WOOD SCRAPER

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

 

 

 

 

 

 

 

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