Opel Frontera UBS. Manual - part 235

 

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Opel Frontera UBS. Manual - part 235

 

 

6A–7

ENGINE MECHANICAL

Condition

Correction

Possible cause

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

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

Engine lacks power

Spark plugs fouled

Clean

Fuel injectors defective

Replace

Mass Airflow 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

Knock Sensor or Knock Sensor
circuits defective

Correct or replace

Knock Sensor Module or Knock
Sensor Module circuits defective

Correct or replace

6A–8

ENGINE MECHANICAL

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

Excessive play in accelerator linkage

Adjust or replace

Mass Airflow Sensor circuit open or
poor connections

Correct or replace

Mass Airflow 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

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 Airflow Sensor circuit open or
poor connections

Correct or replace

Mass Airflow 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

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 Airflow 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

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

 

 

 

 

 

 

 

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