Opel Frontera UE. Manual - part 237

6E1–246

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

ROUGH, UNSTABLE, OR INCORRECT IDLE, STALLING SYMPTOM

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.

Step

Action

Value(s)

Yes

Was the On–Board Diagnostic (OBD) System Check
performed?

—

Go to Step 2

Go to OBD

System

Check

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

Was a visual/physical check performed, including the
rotor, ignition coil and secondary ignition wires?

—

Go to Step 4

Go to Visual /

Physical

Check

Verify that the EGR valve is not mounted backwards.

Was a problem found?

—

Verify repair

Go to Step 5

1. Check for incorrect idle speed. Ensure that the

following conditions are present:

Engine fully warm.

Accessories are OFF.

2. Using a Tech 2, monitor IAC position.

Is the IAC position within the specified values?

Between 10

and 50

counts

Go to Step 8

Go to Step 7

1. Visually/physically inspect for the following

conditions:

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

Check for objects blocking the IAC passage or
throttle bore, excessive deposits in the IAC
passage and on the IAC pintle, and excessive
deposits in the throttle bore and on the throttle
plate.

Check for a condition that causes a large
vacuum leak, such as an incorrectly installed
or faulty crankcase ventilation valve brake
booster hose.

Was a problem found?

—

Verify repair

Go to Step 7

Using a Tech 2, monitor TP angle with the engine idling.

Is the TP angle at the specified value and steady?

Go to Step 8

For further

diagnosis,

refer to DTC

P0123

Check for proper ignition voltage output with the spark
tester 5-8840-0383-0.

Was a problem found?

—

Verify repair

Go to Step 9

1. Remove the spark plugs and check for gas or oil

fouling, cracks, wear, improper gap, burned
electrodes, heavy deposits or improper heat range.

2. If spark plugs are fouled, the cause of the fouling

must be determined before replacing the spark
plugs.

Was a problem found?

—

Verify repair

Go to Step 10

6E1–247

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

Yes

Value(s)

Action

Check for a loose ignition control module ground. Refer
to Electrical Ignition System.

Was a problem found?

—

Verify repair

Go to Step 11

Monitor ”Long Term Fuel Trim” on the Tech 2.
Is ”Long Term Fuel Trim” in the negative range (rich
condition)?

—

Go to Step 12

Go to Step 13

Check the items that can cause the engine to run rich.
Refer to Diagnostic Aids in DTC P0172.

Was a problem found?

—

Verify repair

Go to Step 13

Is ”Long Term Fuel Trim” significantly in the positive
range (lean condition)?

—

Go to Step 14

Go to Step 15

Check items that can cause the engine to run leading.
Refer to ”Diagnostic Aids” in DTC P0171.

Was a problem found?

—

Verify repair

Go to Step 14

Check the injector connections. If any of the injectors
are connected to an incorrect cylinder, correct as
necessary.

Was a problem found?

—

Verify repair

Go to Step 16

Perform the Injector Coil/Balance Test.

Was a problem found?

—

Verify repair

Go to Step 17

1. Check the following engine mechanical problems:

Low compression

Leaking cylinder head gasket

Worn or incorrect camshaft

Sticking or leaking valves

Valve timing

Broken valve springs

Camshaft drive belt slipped or stripped.

Was a problem found?

—

Verify repair

Go to Step 18

1. Check for faulty motor 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 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:

Visual/physical inspection

Tech 2 data

Freeze Frame data/Failure Records buffer

All electrical connections within a suspected
circuit and/or system

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E1–248

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

POOR FUEL ECONOMY SYMPTOM

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.

Step

Action

Value(s)

Yes

Was the On–Board Diagnostic (OBD) System Check
performed?

—

Go to Step 2

Go to OBD

System

Check

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

Was a visual/physical check performed?

—

Go to Step 4

Go to Visual /

Physical

Check

Check owner’s driving habits.

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

Are tires at the correct pressure?

Are excessively heavy loads being carried?

Is acceleration too much, too often?

—

Go to Step 5

Go to Step 6

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

Is the action complete?

—

System OK

—

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

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

Was a problem found?

—

Verify repair

Go to Step 7

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

Was a problem found?

—

Verify repair

Go to Step 8

1. Remove the spark plugs and check for gas or oil

fouling, cracks, wear, improper gap, burned
electrodes of heavy deposits.

2. Is spark plugs are fouled, the cause of fouling must

be determined before replacing the spark plugs.

Was a problem found?

—

Verify repair

Go to Step 9

Check for low engine coolant level.

Was a problem found?

—

Verify repair

Go to Step 10

Check for an incorrect or faulty engine thermostat.
Refer to Engine Cooling.

Was a problem found?

—

Verify repair

Go to Step 11

Check for low engine compression. Refer to Engine
Mechanical.

Was a problem found?

—

Verify repair

Go to Step 12

6E1–249

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

Yes

Value(s)

Action

Check for excessive exhaust system back–pressure.
Refer to Restricted Exhaust System Check. Possible
problems could be:

Damaged or collapsed pipes.

Internal muffler failure.

Plugged catalytic converter.

Was a problem found?

—

Verify repair

Go to Step 13

Check for proper calibration of the speedometer.

Does the speed indicated on the speedometer closely
match the vehicle speed displayed on the Tech 2?

—

Go to Step 15

Go to Step 14

Diagnose and repair the inaccurate speedometer
condition as necessary. Refer to Vehicle Speed Sensor
in Electrical Diagnosis.

—

Verify repair

—

Check the air intake system and the crankcase for air
leaks.

Was a problem found?

—

Verify repair

Go to Step 16

1. Review all the diagnostic procedures within this

table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

Visual/physical inspection

Tech 2 data

Freeze Frame data/Failure Records buffer

All connections within a suspected circuit
and/or system

Was a problem found?

—

Verify repair

Go to Step 17

Perform the procedure in Fuel System Pressure Test.

Was the fuel pressure normal?

—

Contact

Technical

Assistance

Verify repair

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