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Old 04-14-2002, 01:59 PM   #1
PeterJ
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Member#: 14727
Join Date: Jan 2002
Vehicle:
2002 impreza RS

Question carbon = engine problem?

Hey, I removed my exhaust for a mod I am doing and I noticed a lot of carbon throughout the entire exhaust system. I looked into the exhaust ports and all of them were black. It wasn't on super-thick, but I could scrape it with my finger nail. My engine is completely stock, has less than 8k miles, and I use 92-94 octane fuel. I had oil changes at 1k, 3k, 5k, and 8k soon. Is this a problem? I don't remember it being there a few months ago while installing my sti engine mounts... please help. -Thanks
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Old 04-14-2002, 02:37 PM   #2
HndaTch627
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Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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it's normal....carbon is a byproduct of combustion...dun worry about it

Jeremy
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Old 04-14-2002, 03:35 PM   #3
PeterJ
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Thanks; I was unaware that there would be so much of it. -Pete
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Old 04-14-2002, 10:26 PM   #4
HndaTch627
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'09 Concours 14 ABS Black

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Quote:
Originally posted by PeterJ
Thanks; I was unaware that there would be so much of it. -Pete
just look at your exhaust tip once in a while that tells you how rich they run these cars...IIRC the Air/Fuel ratio approaches 9:1 @ redline....TALK ABOUT REDICILOUS!!!

they run lean under closed loop and RICH AS HELL under open loop
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