Opel Frontera UE. Manual - part 261

6A–8

ENGINE MECHANICAL (6VD1 3.2L)

Hesitation

Condition

Possible cause

Correction

Hesitation on acceleration

Throttle Position Sensor (TPS)
adjustment incorrect

Replace throttle valve assembly

TPS circuit open or shorted

Correct or replace

Excessive play in accelerator linkage

Adjust or replace

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

Correct or replace

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 shorted

Correct or replace

Knock Sensor (KS) Circuit open or
poor connections

Correct or replace

KS defective

Replace

KS Module circuits open or shorted

Correct or replace

KS 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

6A–9

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

Hesitation at high speeds

Powertrain Control Module defective

Replace

Throttle Position Sensor (TPS) cable
broken or poor connections

Correct or replace

TPS defective

Replace

Engine Coolant Temperature (ECT)
Sensor circuit open or shorted

Correct or replace

ECT Sensor defective

Replace

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

Correct or replace

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

KS circuit open or poor connections

Correct or replace

KS defective

Replace

KS Module circuit open or shorted

Correct or replace

KS 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

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 Sensor not working
normally

Replace

Manifold Absolute Pressure Sensor
not working normally

Replace

Intake Air Temperature Sensor not
working normally

Replace

Engine Coolant Temperature (ECT)
Sensor circuit open or shorted

Correct or replace

ECT 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

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

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 (TPS)
adjustment incorrect

Replace with Throttle Valve ASM

TPS 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