Daewoo Nubira. Manual — part 132

ENGINE CONTROLS 1F – 385

DAEWOO V–121 BL4

9. Discard the O–ring.

Installation Procedure

1. Lubricate a new O–ring. Install the new O–ring onto

the fuel pressure regulator body.

2. Insert the fuel pressure regulator into the fuel rail

body.

3. Install the fuel pressure regulator retaining clamp.

Tighten

Tighten the fuel pressure regulator retaining clamp to
106 lb–in (12 N

S

m).

4. Connect the vacuum hose to the fuel pressure re-

gula–tor.

5. Install the air intake tube.
6. Connect the breather hose to the valve cover.
7. Connect the IAT sensor connector.
8. Connect the negative battery cable.
9. Perform a leak test of the fuel pressure regulator

with the engine off and the ignition ON.

ENGINE COOLANT TEMPERATURE
SENSOR

Removal Procedure

1. Relieve the coolant system pressure.
2. Disconnect the negative battery cable.
3. Disconnect the engine coolant temperature (ECT)

sensor connector.

Notice : Take care when handling the engine coolant tem-
perature sensor. Damage to the sensor will affect the prop-
er operation of the fuel injection system.

4. Remove the ECT sensor from the electronic ignition

(EI) system ignition coil adapter.

Installation Procedure

1. Coat the threads of the ECT sensor with sealer.
2. Install the ECT sensor into the EI system ignition

coil adapter.

Tighten

Tighten the engine coolant temperature sensor to 18
lb–ft (25 N

S

m).

3. Connect the ECT sensor connector.
4. Fill the coolant system.
5. Connect the negative battery cable.

1F – 386

I

ENGINE CONTROLS

DAEWOO V–121 BL4

THROTTLE POSITION SENSOR

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the throttle position (TP) sensor con-

nec–tor.

3. Remove the TP sensor retaining bolts and the TP

sensor.

Installation Procedure

1. With the throttle valve closed, position the TP sen-

sor on the throttle shaft. Align the TP sensor with
the bolt holes.

2. Install the TP sensor retaining bolts.

Tighten

Tighten the throttle position sensor retaining bolts to
18 lb–in (2 N

S

m).

3. Connect the TP sensor connector.
4. Connect the negative battery cable.

THROTTLE BODY

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the intake air temperature (IAT) sensor

connector.

3. Disconnect the breather hose from the valve cover.
4. Remove the air intake tube.

ENGINE CONTROLS 1F – 387

DAEWOO V–121 BL4

5. Disconnect the throttle cables by opening the

throttle and moving the cable through the release
slot.

6. Disconnect the vacuum hoses from the throttle

body.

7. Disconnect the Throttle Position (TP) sensor and

the Idle Air Control (IAC) valve connectors.

8. Disconnect the coolant hoses from the throttle

body.

9. Remove the throttle body retaining nuts.

Notice : Cover the opening of the intake manifold after re-
moving the throttle body assembly. This will prevent any
objects or debris from entering the engine which may
cause damage.

10. Remove the throttle body and discard the gasket.
11. Remove the TP sensor. Refer to ” Throttle Position

Sensor ” in this section.

12. Remove the IAC valve. Refer to ”Idle Air Control

Valve”in this section.

1F – 388

I

ENGINE CONTROLS

DAEWOO V–121 BL4

Installation Procedure

Notice : Use care in cleaning old gasket material from ma-
chined aluminum surfaces. Sharp tools may damage seal-
ing surfaces.
1. Clean the gasket mating surface on the intake

man–ifold.

Notice : The throttle body may be cleaned following disas-
sembly in a cold immersion–type cleaner. The TP sensor
and the IAC valve should not come in contact with any sol-
vent or cleaner, as they may be damaged.
2. Clean the throttle body.
3. Install the TP sensor. Refer to ” Throttle Position

Sensor ” in this section.

4. Install the IAC valve. Refer to”Idle Air Control

Valve”in this section.

5. Install the throttle body assembly with a new gasket

to the intake manifold.

6. Install the throttle body retaining nuts.

Tighten

Tighten the throttle body retaining nuts to 80 lb–in (9
N

S

m).

7. Connect the TP sensor connector and the IAC

valve connector.

8. Connect the coolant hoses to the throttle body.
9. Connect the vacuum hoses to the throttle body.

Important : Make sure the throttle/cruise control cables
do not hold the throttle open. With the engine OFF, check
to see that the accelerator pedal is free.

10. Connect the throttle/cruise cables.
11. Install the air intake tube.
12. Connect the breather hose to the valve cover.
13. Connect the IAT sensor connector.
14. Connect the negative battery cable.
15. Fill the cooling system.