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02-03-2005, 11:05 PM | #1 |
Scooby Specialist
Member#: 6140
Join Date: Apr 2001
Chapter/Region:
MAIC
Location: Middletown, MD, USA
Vehicle:2002 WRX 5MT Sedan WR Blue. Cobb Stage 2 |
Spark Plug Condition
I just removed the spark plugs from my 2002 WRX. They have 75k miles on them (I know I should have replaced them sooner).
They all look about the same and don't seem bad considering the mileage. My question is, why does one side of each plug have a dry brown powdery residue while the other side appears to have gotten most of the wear?
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02-09-2005, 03:01 PM | #2 |
Scooby Newbie
Member#: 80653
Join Date: Jan 2005
Location: Arlington, VA
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Here's a good link, pictures aren't "great" but they're ok:
http://www.theultralightplace.com/sparkplugs.htm When you say brown powdery residue I'm assuming you're referring to the coloration of the top example- which is ok. It shouldn't be excessive- just like an area thats "tan". |
02-09-2005, 07:58 PM | #3 |
Scooby Specialist
Member#: 6140
Join Date: Apr 2001
Chapter/Region:
MAIC
Location: Middletown, MD, USA
Vehicle:2002 WRX 5MT Sedan WR Blue. Cobb Stage 2 |
Thanks for the link.
I should have been more clear -- the dry brown powdery residue seems normal, it's the fact that it is only on one side of the plug that I found strange. The other side of the ground electrode has the obvious wear and black coloration. All four plugs are like this. I took a couple pictures but could not figure out how to post them. If someone could tell me how to do it I'll post a picture. This is most likely normal for this engine (since all four are the same) I am just curious as to why the deposits one the plugs are not uniform. |
02-09-2005, 08:46 PM | #4 |
Scooby Specialist
Member#: 11808
Join Date: Oct 2001
Location: Cape Coral,FL
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The slight difference in discoloration is due to the way the gas charge hits the spark plug. Normal on every car I've owned including my 2.5L subaru. eddie
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02-10-2005, 09:56 AM | #5 | |
Scooby Newbie
Member#: 80653
Join Date: Jan 2005
Location: Arlington, VA
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Quote:
Oh, it's because of the way the flame propagates in the cylinder, temperature variations, fuel concentrations, etc. Anyway- nothing to worry about- they'll always be a little more tan on a different side. If you index your plugs- you'll see the "side" is always the same. I forget if the tan portion appears on the side facing the exhaust or intake valves...I know it's one or the other. |
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