Cylinder head temperature sensor location

Tiny
CHRIS1506
  • MEMBER
  • 1998 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I'm having trouble locating the cylinder head temperature sensor. Can anyone help? Do I need to take the intake out? Or just the alternator? Please help.
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Wednesday, November 20th, 2019 AT 7:18 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The intake needs removed. Here are the directions for replacement of the sensor. I will include intake removal and replacement second.

_______________________________________________________

1998 Ford Truck Expedition 2WD V8-5.4L SOHC VIN L
Coolant Temperature Sensor
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Coolant Temperature Sensor/Switch (For Computer) Service and Repair Procedures Coolant Temperature Sensor
COOLANT TEMPERATURE SENSOR
REMOVAL
1. Remove the intake manifold.

Pic 1

2. Remove the cylinder head temperature sensor.
1 Disconnect the electrical connector.
2 Remove the sensor.

Pic 2

INSTALLATION
1. Install the CHT sensor.
1 Install the sensor.
2 Connect the electrical connector.
2. Install the intake manifold.

____________________________________________________

1998 Ford Truck Expedition 2WD V8-5.4L SOHC VIN L
Removal
Vehicle Engine, Cooling and Exhaust Engine Intake Manifold Service and Repair Procedures Removal
REMOVAL
WARNING:
DO NOT SMOKE OR CARRY LIGHTED TOBACCO OR OPEN FLAME OF ANY TYPE WHEN WORKING ON OR NEAR ANY FUEL-RELATED COMPONENTS. HIGHLY FLAMMABLE MIXTURES ARE ALWAYS PRESENT AND CAN BE IGNITED, RESULTING IN POSSIBLE PERSONAL INJURY.
FUEL IN THE FUEL SYSTEM REMAINS UNDER HIGH PRESSURE EVEN WHEN THE ENGINE IS NOT RUNNING.

1. Disconnect the battery ground cable.
2. Perform preservice procedures.
3. Drain the cooling system.

Pic 3

4. Compress and slide the hose clamp and disconnect the upper radiator hose.
5. Remove the engine Air Cleaner (ACL) and air cleaner outlet tube.

Pic 4

6. Remove the accelerator control splash shield.
1 Remove the bolts.
2 Remove the accelerator control splash shield.

Pic 5

7. Disconnect the accelerator cable from the accelerator cable bracket.
1 Remove the bolt.
2 Slide the accelerator cable up to remove it from the accelerator cable bracket.

Pic 6

8. Disconnect the accelerator cable from the throttle body cam.
1 Roll the throttle body cam forward.
2 Slide the accelerator cable end from the throttle body cam.

Pic 7

9. Remove the throttle return spring.

Pic 8

10. If equipped, disconnect the speed control actuator cable from the throttle body.
1 Remove the speed control actuator cable to accelerator cable bracket bolt.
2 Disconnect the (A) speed control actuator cable from the (B) throttle body cam and position aside.

Pic 9

11. Disconnect the engine vacuum reservoir hose.

Pic 10

12. Remove the bolt and the brake booster vacuum hose and bracket.

Pic 11

13. Disconnect the connector from the throttle position sensor (TP sensor).

Pic 12

14. Disconnect the following throttle body hose connections:
vapor management hose (A)
engine vacuum regulator (B)
Positive Crankcase Ventilation valve (PCV valve) (C)
power brake booster (D)

pic 13

15. Remove the (A) brake booster vacuum hose bracket nut from the (B) brake booster vacuum hose bracket.
16. Disconnect the fuel lines.

Pic 14

17. Disconnect the following electrical connectors:
idle Air Control (IAC) valve
Differential Pressure Feedback (DPFE) transducer
Engine Vacuum Regulator (EVR) sensor

pic 15

18. Remove the EGR valve to exhaust manifold tube
Disconnect the upper and lower EGR valve to exhaust manifold tube fittings.
Disconnect the two DPFE hoses.

Pic 16

19. Disconnect the following vacuum connections:
1 fuel pressure regulator vacuum hose
2 Engine Vacuum Regulator (EVR) hose
3 EGR vacuum hose
4 vapor management valve vacuum hose

pic 17

20. Disconnect the RH fuel injector electrical connectors.

Pic 18

21. Disconnect the LH fuel injector electrical connectors.

Pic 19

22. Disconnect the water temperature indicator sender wiring.
23. Disconnect and remove the eight ignition coils.
24. Remove the drive belt.
25. Remove the Generator (GEN).
26. Remove the bolts and the throttle body.

Pic 20

27. Disconnect the hose clamp and remove the heater water hose.

Pic 21

28. Remove the studs.
29. Remove the water thermostat.

Pic 22

30. Remove the nine bolts.

Pic 23

31. Remove the upper intake manifold.
1 Lift the intake manifold.
2 Disconnect the Intake Manifold Tuning Valve (IMTV) connector.
3 Remove and discard the upper intake manifold gaskets.

Pic 24

32. Remove the bolts.

Pic 25

33. Separate the upper intake manifold from the lower intake manifold and discard the lower intake manifold gasket.

Pic 26

34. Remove the (A) pushpin from the (B) intake manifold insulator and remove from the (C) lower intake manifold.

Pic 27

35. Remove the (A) bolts from the (B) intake manifold tuning valve and remove the intake manifold tuning valve.

_______________________________________________
1998 Ford Truck Expedition 2WD V8-5.4L SOHC VIN L
Installation
Vehicle Engine, Cooling and Exhaust Engine Intake Manifold Service and Repair Procedures Installation
INSTALLATION

pic 28

1. Position the intake manifold tuning valve and install the bolts.

Pic 29

2. Install the intake manifold insulator on the lower intake manifold and install the pushpin.

Pic 30

3. Position the lower intake manifold gasket and the upper intake manifold on the lower intake manifold and loosely install the eight bolts.

Pic 31

4. Tighten the bolts in two steps, in the sequence shown.
Step 1: 2 Nm (18 inch lb)
Step 2: 8-12 Nm (71-106 inch lb)

pic 32

5. Install the studs.

Pic 33

6. Install the upper intake manifold.
Position the upper intake manifold gaskets.
Position the upper intake manifold.
Loosely install the nine bolts.

Pic 34

7. Connect the intake manifold tuning valve connector.
8. Install the water thermostat.

Pic 35

9. Tighten the bolts in two steps, in the sequence shown.
Step 1: 2 Nm (18 inch lb)
Step 2: 20-30 Nm (15-22 ft. Lbs.)
10. Position the throttle body onto the upper intake manifold and install the bolts.

Pic 36

11. Install the heater water hose and position the clamp.

Pic 37

12. Connect the water temperature indicator sender wiring.
13. Install the generator.
14. Install the drive belt.
15. On 5.4L engines, install the eight ignition coils.

Pic 38

16. Connect the LH fuel injector electrical connectors.

Pic 39

17. Connect the RH fuel injector electrical connectors.

Pic 40

18. Connect the following vacuum connections:
1 Fuel pressure regulator vacuum connector
2 Engine vacuum regulator vacuum connector
3 EGR vacuum connector
4 Vapor management valve vacuum connector

pic 41

19. Connect the EGR valve to exhaust manifold fittings, and tighten to specification.

Pic 42

20. Connect the following electrical connectors:
Idle Air Control Valve (IAC valve)
DPFE transducer
Engine vacuum regulator sensor
21. Connect the fuel lines.

Pic 43

22. Position the brake booster vacuum hose bracket and install the nut.

Pic 44

23. Install the throttle return spring.

Pic 45

24. Connect the accelerator cable to throttle body cam.
1 Rotate the throttle body cam forward.
2 Slide the accelerator cable into the throttle body cam.

Pic 46

25. Connect the accelerator cable to accelerator cable bracket.
1 Slide the accelerator cable into the accelerator cable bracket.
2 Install the bolt.

Pic 47

26. Install the accelerator control splash shield.
27. Install the air cleaner outlet tube and the engine air cleaner.

Pic 48

28. Install the upper radiator hose and reposition the clamp.
29. Fill the cooling system.
30. Install the engine cover.
31. Connect the battery ground cable.

_______________________________________

Let me know if this helps.

Joe
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Wednesday, November 20th, 2019 AT 8:12 PM
Tiny
CHRIS1506
  • MEMBER
No you were wrong. I didn't have to take the intake out. Also maybe you can help me, my water temperature is stuck on cold and I want to install a mechanical water temperature gauge on my SUV. Where is the best place to connect the sensor? Is it on top of the intake? Or? And I already change both the ect and cht sensor.
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Saturday, November 30th, 2019 AT 12:10 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

That's good news then. As far as the mechanical gauge idea, I have to be honest, both are used by the PCM to determine engine conditions for proper performance. I feel if you disconnect either, you may have driveability issues and it will set the check engine light.
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Saturday, November 30th, 2019 AT 9:48 PM

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