Daewoo MATIZ Service Manual page 386

1F – 288 ENGINE CONTROLS
LACK OF POWER, SLUGGISHNESS, OR SPONGINESS
Definition: The engine delivers less than expected pow-
er. There is little or no increase in speed when the accel-
erator pedal is partially applied.
Step
Were the Important Preliminary Checks performed?
1
1. Verify the customer's complaint.
2. Compare the performance of the customer's
2
vehicle with a similar unit.
Does the problem exist?
1. Inspect the air filter for excessive contamination.
2. Replace the air filter as needed.
3
3. Check the transaxle shift pattern and down shift
operation.
Does the transaxle operate properly?
Check the fuel system pressure.
4
Is the fuel system pressure within specifications?
Repair the transaxle as needed.
5
Is the repair complete?
Repair the fuel system as needed.
6
Is the repair complete?
Check for a restricted fuel filter or contaminated fuel.
7
Is the problem found?
Repair or replace any components as needed.
8
Is the repair complete?
1. Check the ignition system output for all of the
cylinders using a spark tester.
9
2. Check for proper ignition control operation.
Is the ignition system operating properly?
1. With the engine at normal operating temperature,
connect a vacuum gauge to a vacuum port on the
intake manifold.
2. Operate the engine at 1000 rpm.
3. Record the vacuum reading.
10
4. Increase the engine speed to 2500 rpm.
5. Note the vacuum reading at a steady 2500 rpm.
Does the vacuum decrease more than the value
specified?
Repair or replace any ignition system components
as needed.
11
Is the repair complete?
Inspect the exhaust system for restrictions and
damaged or collapsed pipes.
12
Is the problem found?
Repair or replace any components as needed.
13
Is the repair complete?
1. Check the cylinder compression and valve timing.
14 2. Inspect the camshaft for excessive wear.
Is the problem found?
Action Value(s) Yes
–
Go to Step 2
–
Go to Step 3
–
Go to Step 4
380 kPa
(55 psi) Go to Step 7
–
System OK
–
System OK
–
Go to Step 8
–
System OK
–
Go to Step 10
10 kPa
(3 in Hg) Go to Step 12
–
System OK
–
Go to Step 13
–
System OK
–
Go to Step 15
No
Go to
"Important
Preliminary
Checks"
System OK
Go to Step 5
Go to Step 6
–
–
Go to Step 9
–
Go to Step 11
Go to Step 15
–
Go to Step 14
–
Go to Step 16
DAEWOO M-150 BL2