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Spark Plug Gap

 
Old 02-02-2017, 06:21 PM
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2005 C55 AMG
Spark Plug Gap

2005 C55. I've seen in listed as 0.031 in and 0.040 in. Which is it? OEM plugs.

Last edited by gofisch; 02-03-2017 at 07:33 PM.
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Old 02-03-2017, 07:34 PM
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2005 C55 AMG
Was this that stupid of a question?
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Old 02-04-2017, 07:52 PM
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C32 amg
I think Bosch plugs are pre gapped at .40
ngk is .41 I think
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Old 02-04-2017, 10:13 PM
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2005 C55 AMG
So the owners manual I found says they are gapped at the 0.031. The new ones I looked at are all listed at 0.040. So you don't change the gap to what the owners manual says, just leave them as them come?
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Old 02-05-2017, 12:18 AM
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2006 E55, 2005 C55, 2005 E320 Estate Sport, 2015 ML350
Just leave them as they come.
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Old 02-05-2017, 01:57 AM
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2002 C32AMG
If misses like crazy at WOT you may have to close the gap a bit
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Old 02-05-2017, 08:17 PM
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2006 E350; 2008 911 C2; 2005 C55; 2003 360 Modena
The correct plug for C55 is NGK ILFR 6 A, gapped to .031 in, torqued to 18-22 ft/lb.

The NGK plug is preset at .031 in. If a different equivalent plug is used and not preset to .031 - re-gap it.

Last edited by kjb55; 02-05-2017 at 08:19 PM. Reason: clarified gap presets
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