2007 ISUZU KB P190 torque

Engine Management – V6 – Service Operations Page 6C1-3–46

2 Disconnect the wiring harness connector (1) from the
MAF sensor.
3 Remove the air intake duct, refer to 2.16 Intake Air Duct Assembly.

Figure 6C1-3 – 63
5 Remove the nut (1), two places, attaching the MAF sensor (2) to the upper air cleaner housing (3).
6 Position the flexible air intake duct away from the MAF sensor and remove the MAF sensor.
NOTE
The MAF sensor seal (4) is part of the air cleaner
upper housing and is not serviced as a separate
item.
Figure 6C1-3 – 64
Reinstall
Reinstallation of the mass air flow (MAF) sensor is the reverse of the removal procedure, noting the following:

Care must be taken not to over tighten the
MAF sensor attaching nuts. Over tightening
the nuts may cause damage to the MAF
sensor seal and allow unfiltered air to enter
the air intake system.
1 Tighten the MAF sensor nuts to the correct torque specification. Mass air flow sensor attaching nut
torque specification .....................................1.8 – 2.2 Nm
2 Tighten the air intake duct retaining clamp screw to the correct torque specification. Air intake duct retaining clamp
torque specification .....................................1.8 – 2.5 Nm
3 Start the engine and check for any air leaks between the air intake duct, the MAF and the upper air cleaner housing.
4 Road test the vehicle and check for correct operation, taking particular note that no air leaks are evident.

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ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–51

Analysis of Spark Plug Condition

Figure 6C1-3 – 69
Legend
1 Normal
2 Carbon Fouled
3 Oil Fouled
4 Deposit Fouling A 5 Deposit Fouling B
6 Deposit Fouling C
7 Detonation
8 Pre-ignition 9 Heat Shock Failure
10 Insufficient Installation Torque

Normal Operation (1)
Brown or greyish-tan deposits and slight electrode wear indicate correct spark plug heat range and mixed periods of high
and low speed driving.
Carbon Fouled (2)
Dry, fluffy black carbon deposits possibly due to poor ignition output, a weak coil, excessive idling or slow speeds under
light load. If spark plug temperatures remain too low for normal combustion, the deposits are not burned off.

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Engine Management – V6 – Service Operations Page 6C1-3–52

Oil Fouled (3)
W et, oily deposits with minor electrode wear possibly due to oil leaking past worn piston rings.
Breaking in a new or recently overhauled engine before the rings are fully seated may also result in this condition.
Deposit Fouling A (4)
Red brown, yellow and white coloured coatings on the insulator tip which are by-products of combustion. They come
from fuel and lubricating oil which generally contain additives. Most powdery deposits have no adverse effect on spark
plug operation, however, they may cause intermittent missing under severe operating conditions.
Deposit Fouling B (5)
Deposits similar to those identified in deposit fouling A (4). These are also by-products of combustion from fuel and
lubricating oil. Excessive valve stem clearances and / or defective intake valve seals allow too much oil to enter the
combustion chamber. The deposits will accumulate on the portion of the spark plug that projects into the chamber and
will be heaviest on the side facing the intake valve. If this condition is only detected in one or two cylinders, check the
valve stem seals.
Deposit Fouling C (6)
Most powdery deposits identified in deposit fouling A (4) have no adverse effect on the operation of the spark plug as
long as they remain powdery.
Under certain conditions of operation however, these deposits melt and form a shiny glaze coating on the insulator.
W hen hot, this acts as a good electrical conductor allowing the current to flow along the deposit instead of sparking
across the gap.
Detonation (7)
Commonly referred to as engine knock or pinging, detonation causes severe shocks inside the combustion chamber
causing damage to parts.
Pre-ignition (8)
Burnt or blistered insulator tip and badly eroded electrodes probably due to the excessive heat.
This is often caused by a cooling system blockage, sticking valves, improperly installed spark plugs or plugs that are the
wrong heat rating (too hot).
Sustained high speed with a heavy load can produce temperatures high enough to cause pre-ignition.
Heat Shock Failure (9)
A rapid increase in spark plug tip temperature under severe operating conditions can cause heat shock and result in
fractured insulators. This is a common cause of broken and cracked insulator tips.
Insufficient Installation Torque (10)
Poor contact between the spark plug and the cylinder head seat.
The lack of proper heat transfer that results from poor seat contact causes overheating of the spark plug. In many cases,
severe damage occurs. Dirty threads in the cylinder head can cause the plug to seize before it is seated.
Ensure the cylinder head and spark plug threads are free of deposits, burrs and scale before installation.

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ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–53

Reinstall
Reinstallation of the spark plug is the reverse of the removal procedure, noting the following:

• Discard the spark plug if it has been
dropped.
• Do not use anti-seize compound or similar
lubricant on the spark plug threads.
1 Using a suitably sized rubber tube attached to the spark plug terminal post, hand start each spark plug into the cylinder head thread.

Failure to tighten a spark plug to the correct
torque specification may result in premature
spark plug failure, and / or engine damage.
2 Tighten the spark plug/s to the correct torque specification. Spark plug torque specification ...............16.0 – 20.0 Nm
3 Road test the vehicle and check for correct operation.
2.23 Throttle Body Assembly
Handling Precautions

Under no circumstances should the clip (1),
six places, retaining the cover plate (2) to the
throttle body be removed. If the cover is
removed, the vacuum seal between the cover
plate and the throttle body will be broken.
This will allow the ingress of foreign particles
and / or moisture and render the throttle body
unserviceable
The throttle body must not be subjected to
any form of shock such as dropping it. If the
throttle body is subjected to shock, damage
may result to the fragile motor magnets
within the throttle body.
Figure 6C1-3 – 70
Remove
1 Turn the ignition switch off.

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Engine Management – V6 – Service Operations Page 6C1-3–56

3 Reinstall the throttle body bolts and tighten to the correct torque specification.
Throttle body assembly attaching bolt
torque specification ...................................8.0 – 12.0 Nm

After reinstalling the wiring harness
connector, ensure the connector latch (1) and
connector lock (2) have fully engaged.
4 Reinstall the wiring harness connector to the throttle body, ensuring the connector latch and connector slide
have fully engaged.
5 Ensure the wiring harness is correctly routed and attached securely in the throttle body harness
retaining clip (3).
Figure 6C1-3 – 74
6 Road test the vehicle and check for correct operation, taking particular note that no air leaks are evident.

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Engine Management – V6 – Service Operations Page 6C1-3–61

5 Torque Specifications
Fuel Rail Attaching Bolt ............................................................... 8.0 – 12.0 Nm
Accelerator Pedal Position Sensor Support Bracket
Attaching Nut ............................................................................... 8.5 – 11.5 Nm
Air Cleaner Lower Housing Attaching Bolt................................. 18.0 – 22.0 Nm
Barometric Pressure Sensor Attaching Bolt ................................ 8.0 – 12.0 Nm
Camshaft Position Sensor Attaching Bolt .................................... 8.0 – 12.0 Nm
Crankshaft Position Sensor Attaching Bolt .................................. 8.0 – 12.0 Nm
Engine Coolant Temperature Sensor ................................................... 22.0 Nm
Engine Control Module Attaching Bolt ......................................... 8.0 – 12.0 Nm
Ground Terminal Attaching Screw.......................................................... 4.5 Nm
Engine Control Module Bracket Assembly
Attaching bolt (6mm Bolt) ............................................................ 8.0 – 12.0 Nm
Engine Control Module Bracket Assembly
Attaching bolt (8mm Bolt) .......................................................... 20.0 – 25.0 Nm
Engine Oil Pressure Sensor ...................................................... 12.0 – 14.0 Nm
Heated Oxygen Sensor ............................................................. 40.0 – 50.0 Nm
Ignition Coil Attaching Bolt........................................................... 7.0 – 11.0 Nm
Air Intake Duct Retaining Clamp ................................................... 1.5 – 2.5 Nm
Knock Sensor Attaching Bolt ..................................................... 21.0 – 25.0 Nm
Mass Air Flow Sensor Attaching Nut ............................................. 1.8 – 2.2 Nm
Spark Plug ................................................................................. 16.0 – 20.0 Nm
Throttle Body Assembly Attaching Bolt........................................ 8.0 – 12.0 Nm

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Charging System – V6 Page 6D1-1-2

4.3 Drive Belt Routing................................................................................................................................................ 18
Without Air Conditioning ....................................................................................................... ............................. 18
6 Specifications .......................................................................................................................................19
7 Torque Wrench Specifications................................................................................................... .........20
8 Special Tools ........................................................................................................................................21

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Charging System – V6 Page 6D1-1-16


Reinstall
Reinstallation of the generator is the reverse of the removal procedure, noting the following:
1 Tighten all fasteners to the correct torque specification.
2 Reconnect the battery ground lead.
3 Start the engine.
4 Check the generator warning indicator operation.
5 Check the drive belt is correctly routed and aligned.
6 Check the generator output. Refer to 3.3 On-vehicle Testing.
7 Check the voltage regulator operation. Refer to 3.3 On-vehicle Testing.
8 Turn the ignition switch off.
Generator mounting bolts ........................... (1) 58.0 Nm
Generator mounting bolts ........................... (2) 58.0 Nm
Generator mounting bolts ........................... (4) 58.0 Nm
Battery harness to P-9 pin B nut
torque specification ...................................7.1 – 13.3 Nm

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ISUZU KB P190 2007