Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Spark Plug: Service and Repair
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Service and Repair
REPLACING ALL SPARK PLUGS
- Switch off ignition.
Version 1: (acoustic cover screwed down)
- Remove seal caps (1) and unfasten nuts (2).
- Remove acoustic cover.
Version 2: (acoustic cover with press-stud fastener)
- Open press-studs (1 ... 4) one at a time, at the same time lifting the acoustic cover slightly.
- Once all four press-studs have been opened, remove the acoustic cover.
Installation Note: Position acoustic cover and press downwards until press-studs (1 ... 4) click into place.
- Remove sealing caps, unfasten nuts.
- Remove cover from ignition coils.
- Unfasten plug connection.
- Unfasten screws on ignition coils.
Installation Note: Ground straps of cylinder head cover must be secured on ignition coils for cylinders 3 and 6.
- Unscrew and remove spark plugs with special tool 12 1 171.
Installation Note:
- Tighten using special tool 12 1 171 and special tool 12 1 200 (torque limiter)
- Without special tool 12 1 200, not tightening torque.
Tightening torque = 30 - 33 Nm (22 - 24 ft lbs)
- Switch off ignition.
Version 1: (acoustic cover screwed down)
- Remove seal caps (1) and unfasten nuts (2).
- Remove acoustic cover.
Version 2: (acoustic cover with press-stud fastener)
- Open press-studs (1 ... 4) one at a time, at the same time lifting the acoustic cover slightly.
- Once all four press-studs have been opened, remove the acoustic cover.
Installation Note: Position acoustic cover and press downwards until press-studs (1 ... 4) click into place.
- Remove sealing caps, unfasten nuts.
- Remove cover from ignition coils.
- Unfasten plug connection.
- Unfasten screws on ignition coils.
Installation Note: Ground straps of cylinder head cover must be secured on ignition coils for cylinders 3 and 6.
- Unscrew and remove spark plugs with special tool 12 1 171.
Installation Note:
- Tighten using special tool 12 1 171 and special tool 12 1 200 (torque limiter)
- Without special tool 12 1 200, not tightening torque.
Tightening torque = 30 - 33 Nm (22 - 24 ft lbs)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.