Opel Frontera UE. Manual - part 1407

6A–5

ENGINE MECHANICAL (6VD1 3.2L)

4. Engine Lacks Compression

Condition

Possible cause

Correction

Engine lacks compression

Spark plug loosely fitted or spark
plug gasket defective

Tighten to specified torque or replace
gasket

Valve timing incorrect

Adjust

Cylinder head gasket defective

Replace gasket

Valve incorrectly seated

Lap valve

Valve stem seized

Replace valve and valve guide

Valve spring weakened or broken

Replace

Cylinder or piston rings worn

Overhaul engine

Piston ring seized

Overhaul engine.

Engine Compression Test Procedure

1. Start and run the engine until the engine reaches

normal operating temperature.

2. Turn the engine off.
3. Remove all the spark plugs.
4. Remove ignition coil fuse (15A) and disable the

ignition system.

5. Remove the fuel pump relay from the relay and fuse

box.

6. Engage the starter and check that the cranking speed

is approximately 300 rpm.

7. Install cylinder compression gauge into spark plug

hole.

8. With the throttle valve opened fully, keep the starter

engaged until the compression gage needle reaches
the maximum level. Note the reading.

9. Repeat the test with each cylinder.

If the compression pressure obtained falls below the
limit, engine overhaul is necessary.

Limit; 1000 kPa (145 psi)

SECTION

6A–6

ENGINE MECHANICAL (6VD1 3.2L)

Rough Engine Idling or Engine Stalling

Condition

Possible cause

Correction

Trouble in fuel injection system

Throttle shutting off incomplete

Correct or replace

Throttle position sensor circuit open
or shorted

Correct or replace

Fuel injector circuits open or shorted

Correct or replace

Fuel injectors damaged

Replace

Fuel pump relay defective

Replace

Mass Air Flow (MAF) Sensor circuit
open or poor connections

Correct or replace

Mass Air Flow (MAF) Sensor
defective

Replace

Manifold Absolute Pressure Sensor
circuit open or poor connections

Correct or replace

Manifold Absolute Pressure Sensor
defective

Replace

Engine Coolant Temperature Sensor
circuit open or poor connections

Correct or replace

Engine Coolant Temperature Sensor
defective

Replace

Intake Air Temperature sensor circuit
open or poor connections

Correct or replace

Intake Air Temperature sensor
defective

Replace

ION Sensing Module cable broken or
poor connections

Correct or replace

ION Sensing Module defective

Replace

Vehicle Speed Sensor circuit open or
shorted

Correct or replace

Vehicle Speed Sensor defective

Replace

Trouble in emission control system

Powertrain Control Module defective

Replace

Exhaust Gas Recirculation Valve
circuit open or poor connections

Correct or replace

Exhaust Gas Recirculation Valve
faulty

Replace

Canister purge valve circuit open or
poor connections

Correct or replace

Canister purge valve defective

Replace

Evaporative Emission Canister
Purge control valve defective

Replace

Trouble in ignition system

Refer to “Hard Start”

Others

Engine lacks compression

Refer to “Hard Start”

Valve incorrectly seated

Lap valve

Air Cleaner Filter clogged

Replace filter element

Valve timing incorrect

Readjust

Idle air control valve broken

Replace

Fast idle solenoid defective

Replace

Positive Crankcase Ventilation valve
defective or clogged

Replace

SECTION

6A–7

ENGINE MECHANICAL (6VD1 3.2L)

Rough Engine Running

Condition

Possible cause

Correction

Engine misfires periodically

Ignition coil layer shorted

Replace

Spark plugs fouling

Clean or install hotter type plug

Spark plug(s) insulator nose leaking

Replace

Fuel injector(s) defective

Replace

Powertrain control module faulty

Replace

Engine knocks periodically

Spark plugs running too hot

Install colder type spark plugs

Powertrain control module faulty

Replace

ION Sensing module faulty

Refer or replace

Engine lacks power

Spark plugs fouled

Clean

Fuel injectors defective

Replace

Mass Air Flow (MAF) Sensor or
Intake Airflow Sensor circuit
defective

Correct or replace

Manifold Absolute Pressure (MAP)
Sensor or Manifold Absolute
Pressure Sensor circuit defective

Correct or replace

Engine Coolant Temperature Sensor
or Engine Coolant Temperature
Sensor circuit defective

Correct or replace

Powertrain Control Module faulty

Replace

Intake Air Temperature Sensor or
Intake Air Temperature Sensor
circuit defective

Correct or replace

Throttle Position Sensor or Throttle
Position Sensor circuit defective

Correct or replace

ION Sensing Module or ION Sensing
Module circuits defective

Correct or replace

SECTION

6A–8

ENGINE MECHANICAL (6VD1 3.2L)

Hesitation

Condition

Possible cause

Correction

Hesitation on acceleration

Throttle Position Sensor adjustment
incorrect

Replace throttle valve assembly

Throttle Position Sensor circuit open
or shorted

Correct or replace

Mass Air Flow (MAF) Sensor circuit
open or poor connections

Correct or replace

Mass Air Flow (MAF) Sensor
defective

Replace

Manifold Absolute Pressure (MAP)
Sensor circuit open or shorted

Correct or replace

MAP Sensor defective

Replace

Intake Air Temperature (IAT) Sensor
circuit open or poor connections

Correct or replace

ION Sensing Module circuit open or
poor connections

Correct or replace

ION Sensing Module defective

Replace

IAT Sensor defective

Replace

Hesitation at high speeds

Fuel tank strainer clogged

Clean or replace

(Fuel pressure too low)

Fuel pipe clogged

Clean or replace

Fuel filter clogged

Replace

Defective fuel pump system

Check and replace

Fuel Pressure Control Valve leaking

Replace

Hesitation at high speeds
(Fuel injector not working normally)

Power supply or ground circuit for
Multiport Fuel Injection System
shorted or open

Check and correct or replace

Fuel Injector defective

Replace

Cable of Multiport Fuel Injection
System circuit open or poor
connections

Correct or replace

SECTION