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Old 05-19-2002, 11:32 PM   #1
Scooby Newbie
Member#: 5836
Join Date: Apr 2001
Location: Chicago, IL, USA
2002 fake STi
silver and pink

Question what color should normal spark plugs be?

I installed one step colder spark plugs and ran them for about 5000 miles. When I changed my stock ones out, they had a greyish tip and looked clean. Today, I took out the colder plugs and the tips were coated with a reddish brown layer. They looked like rust and looked bad. So I changed out the colder plugs and put in the original plugs. Can anyone tell me what the reddish color implies? The reddish residue was all over the plugs. Does that mean my car was running improperly?


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Old 05-19-2002, 11:50 PM   #2
Scooby Specialist
Member#: 8804
Join Date: Jul 2001
Chapter/Region: South East
2008 Impreza STi
Dark Gray Metallic


I'm not positive but I think that is caused by fuel additives like octane booster and injector cleaners. Stuff like that.

Have you added anything like that?
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Old 05-20-2002, 12:33 AM   #3
Pat Green
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Member#: 5818
Join Date: Apr 2001
Location: Fredrickson, WA
2002 WRX, '72 510
V is for Victory, Hippie!


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