Opel Frontera UBS. Manual - part 1225

6E–266

ENGINE DRIVEABILITY AND EMISSIONS

Surges and/or Chuggles Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

10

1. Check for proper ignition voltage output with spark

tester J 26792 (ST-125).  Refer to 

Electric Ignition

System for procedure.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 11

11

1. Check for a loose ignition coil ground.

Refer to 

Electric Ignition System.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 12

12

1. Check the ignition coils for cracks or carbon

tracking.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 13

13

1. Remove the spark plugs and check for wet plugs,

cracks, wear, improper gap, burned electrodes, or
heavy deposits.  Refer to 

Electronic Ignition

System.

NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 14

14

1. Check the injector connections.
2. If any of the injector connectors are connected to an

incorrect cylinder, correct as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 15

15

1. Check PCM grounds for the cleanliness, tightness

and proper locations.  Refer to the PCM wiring
diagrams in 

Electrical Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 16

16

1. Check MAF sensor connections.
2. If a problem is found, replace the faulty terminals as

necessary.  Refer to 

Electrical Diagnosis for wiring

repair procedures.

Was a problem found?

—

Verify repair

Go to 

Step 17

17

1. Visually/physically check vacuum hoses for splits,

kinks, and proper connections and routing as
shown on the “Vehicle Emission Control
Information” label.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 18

6E–267

ENGINE DRIVEABILITY AND EMISSIONS

Surges and/or Chuggles Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

18

1. Check the exhaust system for possible restriction:

D

Inspect the exhaust system for damaged or
collapsed pipes.

D

Inspect the muffler for heat distress or possible
internal failure.

D

Check for a possible plugged three-way
catalytic converter by checking the exhaust
system back pressure.  Refer to 

Restricted

Exhaust System Check.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 19

19

1. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

D

Visual/physical inspection

D

Tech 2 data

D

Freeze Frame data/Failure Records buffer

D

All electrical connections within a suspected
circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E–268

ENGINE DRIVEABILITY AND EMISSIONS

Lack of Power, Sluggish or Spongy Symptom

 

Step

Action

Value(s)

Yes

No

1

DEFINITION:
Engine delivers less than expected power.  Little or no
increase in speed when accelerator pedal is pushed
down part-way.

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,

correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

—

Verify repair

Go to 

Step 3

3

Was a visual/physical check performed?

—

Go to 

Step 4

Go to

Visual/Physic

al Check

4

1. Remove and check the air filter element for dirt or

restrictions.  Refer to 

Air Intake System in

ON-Vehicle Service.

2. Replace the air filter element if necessary.

Was a repair required?

—

Verify repair

Go to 

Step 5

5

1. Check for low fuel pressure.  Refer to 

Fuel System

Pressure Test.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 6

6

1. Check for water- or alcohol-contaminated fuel.
2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 7

7

1. Using Tech 2, monitor the knock sensor (KS)

system for excessive spark retard activity.  Refer to
Knock Sensor (KS) System.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 8

8

1. Check for proper ignition voltage output with spark

tester J 26792 (ST-125).  Refer to 

Electronic Ignition

System for procedure.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 9

9

1. Remove the spark plugs and check for wet plugs,

cracks, wear, improper gap, burned electrodes, or
heavy deposits.  Refer to 

Electronic Ignition

System.

NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 10

10

1. Check the ignition coils for cracks or carbon

tracking.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 11

6E–269

ENGINE DRIVEABILITY AND EMISSIONS

Lack of Power, Sluggish or Spongy Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

11

1. Check the PCM grounds for the cleanliness,

tightness and proper locations.  Refer to the PCM
wiring diagrams in 

Electrical Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 12

12

1. Check the exhaust system for possible restriction:

D

Inspect the exhaust system for damaged or
collapsed pipes.

D

Inspect the muffler for heat distress or possible
internal failure.

D

Check for a possible plugged three-way
catalytic converter by checking the exhaust
system back pressure.  Refer to 

Restricted

Exhaust System Check.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 13

13

1. Check the torque converter clutch (TCC) for proper

operation.  Refer to 

4L30-E Transmission

Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 14

14

1. Check for an engine mechanical problem.  Check

for low compression, incorrect or worn camshaft,
loose timing belt, etc.  Refer to 

Engine Mechanical.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 15

15

1. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

D

Visual/physical inspection

D

Tech 2 data

D

Freeze Frame data/Failure Records buffer

D

All electrical connections within a suspected
circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance