Daewoo NUBIRA User Manual

1F – 364IENGINE CONTROLS
DAEWOO V–121 BL4
LACK OF POWER, SLUGGISHNESS, OR SPONGINESS
The engine delivers less than expected power. There
is little or no increase in speed when the accelerator
pedal is partially applied.
Step Action Value(s) Yes No
1 Were the Important Preliminary Checks performed? Go toStep 2 Go to”Impor-
tant Preliminary
Checks”
2
1. Verify the customer’s complaint.
2. Compare the performance of the customer’s
vehicle with a similar unit.
Does the problem exist?
Go toStep 3 System OK
3
1. Inspect the air filter for excessive contamina-
tion.
2. Replace the air filter as needed.
3. Check the transaxle shift pattern and downshift
operation.
Does the transaxle operate properly?
Go toStep 4 Go toStep 5
4 Check the fuel system pressure.
Is the fuel system pressure within specifications?
41–47 psi
(284–325 kPa)
Go toStep 7 Go toStep 6
5 Repair the transaxle as needed.
Is the repair complete?
System OK
6 Repair the fuel system as needed.
Is the repair complete?
System OK
7 Check for a restricted fuel filter or contaminated fuel.
Is the problem found?
Go toStep 8 Go toStep 9
8 Repair or replace any components as needed.
Is the repair complete?
System OK
9
1. Check the ignition system output for all of the
cylinders using a spark tester.
2. Check for proper ignition control operation.
Is the ignition system operating properly?
Go toStep 10 Go toStep 11
10
1. With the engine at normal operating tempera-
ture, connect a vacuum gauge to a vacuum
port on the intake manifold.
2. Operate the engine at 1,000 rpm.
3. Record the vacuum reading.
4. Increase the engine speed to 2,500 rpm.
5. Note the vacuum reading at a steady 2,500
rpm.
Does the vacuum decrease more than the value
specified?
10 kPa
(3 in. Hg)
Go toStep 12 Go toStep 15
11 Repair or replace any ignition system components
as needed.
Is the repair complete?
System OK
12 Inspect the exhaust system for restrictions and dam-
aged or collapsed pipes.
Is the problem found?
Go toStep 13 Go toStep 14
13 Repair or replace any components as needed.
Is the repair complete?
System OK

Daewoo NUBIRA Specifications

General

Brand	Daewoo
Model	NUBIRA
Category	Automobile
Language	English