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Old 10-26-2011, 09:09 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
Posts: 3,890
Mein Auto: 2004 X3 2.5i
You have to take a big plastic cover off the top of the engine on the passenger side.

You don't see much at all until that is removed - I think the purpose is aerodynamics or just to make the engine area look nice.

Or so that the flat-rate table for auto shops can add a bit of time to spark plug replacement?

Does anyone know for sure - and which auto maker was the first to do it?

For some reason they all followed suit.

A coil pack sits on top of each plug, and replaces what us old timers grew up with - a single ignition coil feeding a distributor with individual HT ignition wires going to each spark plug.

No questioning the merits of that automotive advance, except a failed coil pack might be more serious (and costly) than a degraded ignition wire.

(But minimizes radio interference as a bonus.)
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