Opel Frontera UBS. Manual - part 513

6E–182

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Lack of Power, Sluggish or Spongy Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

11

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 12

12

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–183

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Rough, Unstable, or Incorrect Idle, Stalling Symptom

 

Step

Action

Value(s)

Yes

No

1

DEFINITION:
Engine runs unevenly at idle.  If severe, the engine or
vehicle may shake.  Engine idle speed may vary in
RPM.   Either condition may be severe enough to stall
the engine.

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?

—

Go to 

Step 6

Go to 

Step 3

3

Was a visual/physical check performed?

—

Go to 

Step 4

Go to 

Visual/

Physical

Check

4

1. Check the ECM grounds for cleanliness, tightness

and proper routing.  Refer to the ECM wiring
diagrams in 

Electrical Diagnosis.

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

Was a problem found?

—

Verify repair

Go to 

Step  5

5

1. Check for incorrect idle speed.  Ensure that the

following conditions are present:

D

The engine is fully warm.

D

The accessories are “OFF.”

2. Using a Tech 2, monitor the AP position.

Is the AP position within the specified values?

0%

Go to 

Step 10

Go to 

Step 9

6

1. Visually/physically inspect for the following

conditions:

D

Restricted air intake system.  Check for a
possible collapsed air intake duct, restricted
air filter element, or foreign objects blocking
the air intake system.

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

Was a problem found?

—

Verify repair

Go to 

Step 7

7

1. Injector Test

Operate the each injector by Tech 2 with the
ignition “ON” and check if the working noise
confirm.

2. If a problem is found, check the harness or replace

the injector.

Is the action complete?

—

Verify repair

Go to 

Step 8

8

1. Check the transmission range switch circuit.  Use a

Tech 2 and be sure the Tech 2 indicates that the
vehicle is in drive with the gear selector in drive or
overdrive.

2. If a problem is found, diagnose and repair the

transmission range switch as necessary (Refer to
Automatic Transmission Diagnosis).

Was a problem found?

—

Verify repair

Go to 

Step 9

6E–184

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Rough, Unstable, or Incorrect Idle, Stalling Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

9

1. Check for the following engine mechanical items.

Refer to 

Engine Mechanical for diagnosis

procedures:

D

Low compression

D

Sticking or leaking valves

D

Worn camshaft lobe(s)

D

Camshaft drive belt slipped or stripped

D

Incorrect valve timing

D

Valves clearance

D

Broken valve springs

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

Was a problem found?

—

Verify repair

Go to 

Step 10

10

1. Check for faulty engine mounts.  Refer to 

Engine

Mechanical for inspection of mounts.

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

Was a problem found?

—

Verify repair

Go to 

Step 11

11

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–185

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Poor Fuel Economy Symptom

 

Step

Action

Value(s)

Yes

No

1

DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected.  Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test. (Larger than
standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)

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/

Physical

Check

4

Check owner’s driving habits.

D

Is the A/C “ON” full time (defroster mode “ON”)?

D

Are tires at the correct pressure?

D

Are excessively heavy loads being carried?

D

Is acceleration too much, too often?

D

Is engine oil correct?

Was a problem found?

—

Go to 

Step 5

Go to 

Step 6

5

Review the items in Step 4 with the customer and
advise as necessary.

Is the action complete?

—

System OK

—

6

1. Visually/physically check:  Vacuum hoses for splits,

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

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

Was a repair required?

—

Verify repair

Go to 

Step 7

7

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

restrictions. Refer to 

Air Intake System.

2. Replace the air filter element if necessary.

Was a repair required?

—

Verify repair

Go to 

Step 8

8

1. Check for low engine coolant level.  Refer to 

Engine

Cooling.

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

Was a problem found?

—

Verify repair

Go to 

Step 9

9

1. Check for an incorrect or faulty engine thermostat.

Refer to 

Engine Cooling.

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

Was a problem found?

—

Verify repair

Go to 

Step 10

10

1. Check for low engine compression.  Refer to 

Engine

Mechanical.

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

Was a problem found?

—

Verify repair

Go to 

Step 11