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You need to remove the valve cover ((V8) motor) and remove the spark plug coils, then you can change the plugs.
http://e30world.com/Maintenance/BMW-E30-Sparkplug-Change
where is the location of the spark plugs on a 97 BMW 318 ti.
To change the spark plugs in a 2003 BMW X5, first, ensure the engine is cool and disconnect the battery. Remove the engine cover and locate the spark plug wires or coils. Unscrew and carefully pull out the old spark plugs using a spark plug socket and ratchet, and then insert the new spark plugs, tightening them to the specified torque. Finally, reconnect the spark plug wires or coils, replace the engine cover, and reconnect the battery.
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To change the spark plugs and wires on a 1999 BMW 750iL, first, ensure the engine is cool and disconnect the battery. Remove the engine cover and carefully detach the ignition coil connectors, then unscrew and remove the coils. Take out the old spark plugs using a spark plug socket, install new plugs to the manufacturer's specifications, and reattach the coils and connectors. Finally, replace the engine cover and reconnect the battery.
the bmw 320d is a diesel car therefore it does not have spark plugs as it uses pressure to ignite the fuel rather than a spark it does however have glow plugs which function to heat the engine internally when starting and will show up on the dashboard display as a spring like symbol if they need changing ie the light does not go out after the car starts rather it stays lit while driving then you need to change them
The spark plugs are located on each side of the engine. A V8 engine will have four spark plugs on each side. The spark plugs are usually near the bottom of the engine.