Opel Frontera UE. Manual - part 1408

 

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Opel Frontera UE. Manual - part 1408

 

 

6A–9

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

Hesitation at high speeds

Powertrain Control Module defective

Replace

Throttle Position Sensor cable
broken or poor connections

Correct or replace

Throttle Position Sensor defective

Replace

Engine Coolant Temperature Sensor
circuit open or shorted

Correct or replace

Engine Coolant Temperature Sensor
defective

Replace

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

Correct or replace

Mass Air Flow (MAF) Sensor
defective

Replace

MAP Sensor cable broken or poor
connections

Correct or replace

MAP Sensor defective

Replace

IAT Sensor circuit open or poor
connections

Correct or replace

IAT Sensor defective

Replace

ION Sensing Module circuit open or
poor connections

Correct or replace

ION Sensing Module defective

Replace

Throttle valve not fully opened

Check and correct or replace

Air Cleaner Filter clogged

Replace filter element

Power supply voltage too low

Check and correct or replace

SECTION

6A–10

ENGINE MECHANICAL (6VD1 3.2L)

Engine Lacks Power

Condition

Possible cause

Correction

Trouble in fuel system

Fuel Pressure Control Valve not
working normally

Replace

Fuel injector clogged

Clean or replace

Fuel pipe clogged

Clean

Fuel filter clogged or fouled

Replace

Fuel pump drive circuit not working
normally

Correct or replace

Fuel tank not sufficiently breathing
due to clogged Evaporative
Emission Control System circuit

Clean or replace

Water in fuel system

Clean

Inferior quality fuel in fuel system

Use fuel of specified octane rating

Powertrain Control Module supplied
poor voltage

Correct circuit

Throttle Position Sensor cable
broken or poor connections

Correct or replace

Throttle Position Sensor defective

Replace

Mass Air Flow (MAF) Sensor not
working normally

Replace

Manifold Absolute Pressure Sensor
not working normally

Replace

Intake Air Temperature Sensor not
working normally

Replace

Engine Coolant Temperature Sensor
circuit open or shorted

Correct or replace

Engine Coolant Temperature Sensor
defective

Replace

Powertrain Control Module defective

Replace

Trouble in intake or exhaust system

Air Cleaner Filter clogged

Replace filter element

Air duct kinked or flattened

Correct or replace

TWC defective

Repair

Ignition failure

————

Refer to Hard Start Troubleshooting
Guide

Heat range of spark plug inadequate

Install spark plugs of adequate heat
range

Ignition coil defective

Replace

SECTION

6A–11

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

Engine overheating

Level of Engine Coolant too low

Replenish

Fan clutch defective

Replace

Incorrect fan installed

Replace

Thermostat defective

Replace

Engine Coolant pump defective

Correct or replace

Radiator clogged

Clean or replace

Radiator filler cap defective

Replace

Level of oil in engine crankcase too
low or wrong engine oil

Change or replenish

Resistance in exhaust system
increased

Clean exhaust system or replace
defective parts

Throttle Position Sensor adjustment
incorrect

Replace with Throttle Valve ASM

Throttle Position Sensor circuit open
or shorted

Correct or replace

Cylinder head gasket damaged

Replace

Engine overcooling

Thermostat defective

Replace (Use a thermostat set to
open at 82

°

C (180

°

F))

Engine lacks compression

————

Refer to Hard Start

Others

Tire inflation pressure abnormal

Adjust to recommended pressures

Brake drag

Adjust

Clutch slipping

Adjust or replace

Level of oil in engine crankcase too
high

Correct level of engine oil

Exhaust Gas Recirculation Valve
defective

Replace

Engine Noisy

Abnormal engine noise often consists of various noises
originating in rotating parts, sliding parts and other
moving parts of the engine. It is, therefore, advisable to
locate the source of noise systematically.

Condition

Possible cause

Correction

Noise from crank journals or from
crank bearings
(Faulty crank journals and crank

Oil clearance increased due to worn
crank journals or crank bearings

Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing

y

j

bearings usually make dull noise that
becomes more evident when
accelerating)

Crankshaft out of round

Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing

Crank bearing seized

Crank bearing seized Replace crank
bearings and crankshaft or regrind
crankshaft and install the undersize
bearing

SECTION

6A–12

ENGINE MECHANICAL (6VD1 3.2L)

Troubleshooting Procedure
Short out each spark plug in sequence using insulated
spark plug wire removers. Locate cylinder with defective
bearing by listening for abnormal noise that stops when
spark plug is shorted out.

Condition

Possible cause

Correction

Noise from connecting rods or from
connecting rod bearings
(Faulty connecting rods or

Bearing or crankshaft pin worn

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

y

g

connecting rod bearings usually
make an abnormal noise slightly
higher than the crank bearing noise,
which becomes more evident when

Crankpin out of round

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

which becomes more evident when
engine is accelerated)

Connecting rod bent

Correct or replace

g

)

Connecting rod bearing seized

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

Troubleshooting Procedure
Abnormal noise stops when the spark plug on the cylinder
with defective part is shorted out.

Condition

Possible cause

Correction

Piston and cylinder noise
(Faulty piston or cylinder usually

k

bi

d

h

i

l

Piston clearance increased due to
cylinder wear

Replace piston and cylinder body

makes a combined mechanical
thumping noise which increases

Piston seized

Replace piston and cylinder body

g

when engine is suddenly accelerated
but diminishes gradually as the

Piston ring broken

Replace piston and cylinder body

but  diminishes  gradually  as  the
engine warms up)

Piston defective

Replace pistons and others

Troubleshooting Procedure
Short out each spark plug and listen for change in engine
noise.

Condition

Possible cause

Correction

Piston pin noise
(Piston makes noise each time it
goes up and down)

Piston pin or piston pin hole worn

Replace piston, piston pin and
connecting rod assy

SECTION

 

 

 

 

 

 

 

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