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Old 02-17-2007, 04:16 PM   #1
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Indexed spark plugs?

Quick question. How are the Boxster's spark plugs indexed?...does cylinder 1 require spark plug indexed A?...cyl 2 require B?...etc.

If I go to the dealer and buy a set of OEM plugs, will they come in an indexed set?

thanks in advance

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Old 02-17-2007, 06:32 PM   #2
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I don't believe they require indexing at all. I've replaced ours twice with the Bosch #FR7LDC4 plugs (the ones the dealer carries) and never had any problems at all.
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Old 02-18-2007, 04:43 AM   #3
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Old 02-18-2007, 09:16 PM   #4
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The OEM plugs are indexed, they do require it. But, also, be sure to torque the properly as well. This determines the depth of the electrodes into the combustion chamber as well as proper sealing in the head for proper compression.

The critical thing to remember is that there is NO Universal Standard on heat ranges. One Plug's manufacturer's '7' range plug can be completely different than another manufacturer's. Also, the Thread pitch and number of threads are critical. The OEM plug is designed to present the plug in the Combustion Chamber in the proper orientation and proper depth based on these, but only when properly torqued, another manufacturer's plug isn't...

Happy Motoring!... Jim'99

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