Dodge Nitro. Manual - part 54

Fig. 155: Intake Manifold Seals 
Courtesy of CHRYSLER LLC 

The intake manifold uses single plane sealing which consist of six individual press in place port gaskets (2) to 
prevent leaks. The throttle body attaches directly to the intake manifold. 

DIAGNOSIS AND TESTING 

INTAKE MANIFOLD LEAKS 

An intake manifold air leak is characterized by lower than normal manifold vacuum. Also, one or more 
cylinders may not be functioning. 

1. Start the engine.  

2. Spray a small stream of water (spray bottle) at the suspected leak area.  

3. If engine RPM'S change, the area of the suspected leak has been found.  

4. Repair as required.  

REMOVAL 

INTAKE MANIFOLD 

WARNING:

USE EXTREME CAUTION WHEN THE ENGINE IS OPERATING. DO NOT 
STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS 
NEAR THE PULLEYS, BELTS OR THE FAN. DO NOT WEAR LOOSE 
CLOTHING.

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

Fig. 156: Throttle Body 3.7L, Mounting Bolts & Elec. Connector 
Courtesy of CHRYSLER LLC 

1. Bleed the fuel system. Refer to STANDARD PROCEDURE .  

2. Disconnect the negative cable from battery.  

3. Remove the resonator assembly and air inlet hose.  

4. Drain the cooling system below coolant temperature sensor level.  

5. Disconnect the electronic throttle control (ETC) connector (3). 

Fig. 157: Map Sensor - 3.7L, Map Sensor, ECT Sensor & Front Of Intake Manifold

1 - THROTTLE BODY
2 - MOUNTING BOLTS
3 - ELEC. CONNECTOR

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

Courtesy of CHRYSLER LLC 

6. Disconnect electrical connectors for the following components: 

Coolant Temperature Sensor  

Manifold Absolute Pressure (MAP) Sensor (2)  

Fig. 158: EGR Solenoid/Tube Assembly 
Courtesy of CHRYSLER LLC 

7. Disconnect vapor purge hose, brake booster hose, and positive crankcase ventilation (PCV) hose.  

8. Disconnect and remove ignition coil towers.  

9. Remove the top oil dipstick tube retaining bolt.  

10. Remove the EGR tube (1). Refer to REMOVAL .  

11. Remove fuel rail. Refer to REMOVAL . 

1 - MOUNTING SCREWS
2 - MAP SENSOR
3 - ECT SENSOR
4 - FRONT OF INTAKE MANIFOLD

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

Fig. 159: Throttle Body 3.7L, Mounting Bolts & Elec. Connector 
Courtesy of CHRYSLER LLC 

12. Remove throttle body assembly (1). 

Fig. 160: 3.7L Intake Torque Sequence 
Courtesy of CHRYSLER LLC 

13. Remove the intake manifold retaining fasteners in reverse order of tightening sequence.  

14. Remove the intake manifold.  

1 - THROTTLE BODY
2 - MOUNTING BOLTS
3 - ELEC. CONNECTOR

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro