Content .. 134 135 136 137 ..

Mazda CX 7. Manual - part 136

IGNITION SYSTEM [L3 WITH TC]

01-18–3

01-18

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

Revised 8/2006 (Ref. No. R087/06)

SPARK PLUG REMOVAL/INSTALLATION[L3 WITH TC]

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Caution

• If a spark plug that is not as specified is installed, engine performance will be deteriorated. Install

only the specified spark plug when replacing.

1. Disconnect the negative battery cable.
2. Remove the charge air cooler. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)
3. Remove the ignition coils. (See 01-18-2 IGNITION COIL REMOVAL/INSTALLATION[L3 WITH TC].)
4. Remove the spark plugs using a plug-wrench.
5. Install in the reverse order of removal.

Tightening torque

10— 14 N·m {1.1— 1.4 kgf·m, 8.0— 10 ft·lbf}

End Of Sie

SPARK PLUG INSPECTION[L3 WITH TC]

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Specification

Spark plug type

L3K9 18 110A, L3Y3 18 110

Plug Gap Inspection

Caution

• To avoid possible damage to the tip, do not adjust the plug gap.

• To prevent damaging the tip, use a wire type plug gap gauge when inspecting the plug gap.

1. Measure the spark plug gap using a wire type plug gap gauge.

• If not within the specification, replace the spark plug.

Spark plug gap

0.7— 0.8 mm {0.028— 0.031 in}

Cleaning

Caution

• Carbon may adhere to the tip of the spark plug during vehicle delivery or repeated short distance

driving during the winter time. If there is any malfunction such as rough idling or start difficulty
due to carbon adhesion causing plug fouling, burn off the carbon by performing no-load racing of
the engine.

• When performing the no-load racing, apply the side brake and foot brake, move the selector lever

to P position to prevent an accident and serious injury.

• To avoid possible damage to the spark plug tip, do not use a wire brush for cleaning.

Note

• To avoid possible damage to the tip, use gasoline to clean the spark plugs after removing dirt.

• If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to

the idle speed. This is due to the fuel cut control operation, which prevents overheating, and it does not
indicate a malfunction.

• Do not perform no-load racing at high engine speed continuously for 10 s or more.

1. If there is carbon adhering to the spark plug, perform no-load racing at 4,000 rpm for 2 min, 2 times.

IGNITION SYSTEM [L3 WITH TC]

01-18–4

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

Visual Inspection

1. Inspect the following items:

• If any of the following malfunctions are

indicated, replace the spark plug.

— Insulator breakage

— Worn electrode

— Damaged gasket

— Badly burned insulator (sparking side)

Resistance Inspection

1. Measure the resistance of the spark plug using a

tester as shown in the figure.

• If not within the specification, replace the

spark plug.

Spark plug resistance [25

°C {77 °F}]

3.0— 7.5 kilohms

End Of Sie

DAMAGE

BURNS

BREAKAGE

WEAR AND
CARBON
DEPOSITS

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STARTING SYSTEM [L3 WITH TC]

01-19–1

01-19

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

Revised 12/2006 (Ref. No. R215/06)

01-19

STARTING SYSTEM [L3 WITH TC]

STARTING SYSTEM LOCATION INDEX

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-19–1

STARTER REMOVAL/INSTALLATION

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-19–2

Heater Pipe Removal Note . . . . . . . . . 01-19–3
Starter Removal Note . . . . . . . . . . . . . 01-19–3

Starter Installation Note . . . . . . . . . . . . 01-19–3

STARTER INSPECTION

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-19–4

On-vehicle Inspection . . . . . . . . . . . . . . 01-19–4
No-load Test . . . . . . . . . . . . . . . . . . . . . 01-19–4
Magnetic Switch

Operation Inspection . . . . . . . . . . . . . . 01-19–4

Pinion Gap Inspection . . . . . . . . . . . . 01-19-4–1
Starter Inner Parts Inspection . . . . . . 01-19-4–1

STARTER DISASSEMBLY/ASSEMBLY

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-19–7

End of Toc

WM: STARTING SYSTEM

STARTING SYSTEM LOCATION INDEX[L3 WITH TC]

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End Of Sie

WM: STARTER

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Starter
(See 01-19-2 STARTER REMOVAL/
INSTALLATION[L3 WITH TC].)

(See 01-19-4 STARTER INSPECTION[L3 WITH
TC].)

(See 01-19-7 STARTER DISASSEMBLY/
ASSEMBLY[L3 WITH TC].)

STARTING SYSTEM [L3 WITH TC]

01-19–2

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

Revised 12/2006 (Ref. No. R215/06)

STARTER REMOVAL/INSTALLATION[L3 WITH TC]

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Warning

• Remove and install all parts when the engine is cold, otherwise they can cause severe burns or

serious injury.

• When the battery cables are connected, touching the vehicle body with starter terminal B will

generate sparks. This can cause personal injury, fire, and damage to the electrical components.
Always disconnect the negative battery cable before performing the following operation.

1. Remove the battery and battery tray. (See 01-17-2 BATTERY REMOVAL/INSTALLATION[L3 WITH TC].)
2. Remove the charge air cooler duct, air cleaner and fresh air duct component, and air hose. (See 01-13-5

INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)

3. Remove the under cover.
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.

TURBOCHARGER

N·m {kgf·m, ft·lbf}

16.3—23.5
{1.7—2.3, 12.1—17.3}

38—51 {3.9—5.2, 29—37}

7.8—10.8 N·m
{79.6—110.1 kgf·cm, 69.1—95.5 in·lbf}

9.8—11.7 N·m
{100—119 kgf·cm,
86.8—103.5 in·lbf}

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Wiring harness and wiring harness bracket

Heater pipe
(See 01-19-3 Heater Pipe Removal Note.)

Terminal B cable

Terminal S connector

Starter
(See 01-19-3 Starter Removal Note.)

(See 01-19-3 Starter Installation Note.)

Content .. 134 135 136 137 ..