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Sparks plugs and/or ignition coils replacement

Introduction

Applicable to H4D and H4Bt engines (M281 E10 and M281 E09)
It is advisable to do this operation on a cold engine.

Recommendations :

Replace every: 60,000km/4 years (Iridium) or 20,000km (Copper/Nickel).

Electrode gap: 0.8mm (varies depending on the spark plug model considered)

H4Bt: Iridium spark plugs mandatory.

H4D: you may favor Iridium spark plugs if using E85.

See Wiki for more info.

What you need

  1. Sparks plugs and/or ignition coils replacement, Accessing the engine hood: step 1, image 1 of 1

    • Open the trunk.

    • Put aside the trunk carpets.

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  2. Sparks plugs and/or ignition coils replacement, Acessing the engine compartment: step 2, image 1 of 1

    • Unscrew the 6 T50 screws by hand or using a wrench and a socket.

    • Lift and put aside the engine hood.

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  4. Sparks plugs and/or ignition coils replacement, Extracting ignition coils: step 3, image 1 of 3 Sparks plugs and/or ignition coils replacement, Extracting ignition coils: step 3, image 2 of 3 Sparks plugs and/or ignition coils replacement, Extracting ignition coils: step 3, image 3 of 3

    • Disconnect and put aside the oil vapors duct.

    • Disconnect the ignition coils' connector.

    • Unscrew each 8mm bolts of the 3 ignition coils.

    • Gently extract the ignition coils.

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  5. Sparks plugs and/or ignition coils replacement, Extracting the spark plugs: step 4, image 1 of 2 Sparks plugs and/or ignition coils replacement, Extracting the spark plugs: step 4, image 2 of 2

    • Unscrew and extract the spark plugs using a 14mm spark plug socket.

    • Clean off and/or dust off the debris in the zone to avoid contamination in the cylinders.

    • The Nickel/Copper spark plug shown aside is around 25.000km aged, using 100% E85.

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  6. Sparks plugs and/or ignition coils replacement, Installating the new spark plugs: step 5, image 1 of 1

    • Torque the new spark plug using a 14mm spark plug socket at 24 N.m.

    • Verify and ajust the spark plug gap to the considered model's spec if necessary.

    • The RTA (French Revue Technique Automobile) and spark plug manufacturers advise not to grease the spark plug's thread.

    • Do not modify an used spark plug's gap.

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  7. Sparks plugs and/or ignition coils replacement, Reinstalling the ignition coils: step 6, image 1 of 2 Sparks plugs and/or ignition coils replacement, Reinstalling the ignition coils: step 6, image 2 of 2

    • Put back the ignition coils on the spark plugs.

    • Torque each of the 3 ignition coils' 8mm bolts at 10 N.m.

    • Reconnect the ignition coil's connectors.

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Conclusion

Congratulations ! You replaced you spark plugs/ignition coils !

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