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Old 04-13-2009, 08:56 AM   #1
Scooby Newbie
Member#: 81028
Join Date: Feb 2005
Location: Stockholm, Sweden
2002 Impreza 2.5RS
Midnight Pearl

Question Red "powder" on sparkplug cable

When I pull out the sparkplug cable for cyl 4 the part going inside the engine is coated with some red/brown power. Looks like rust. Any ideas what it is and where it coming from?

I first notice the problem when i replaced the plugs at ~60000km a couple of years ago. Last summer I got a problem that I traced down to the 4-cyl sparkplug cable. It once again was coated with this red powder. All plugs and cables was then replaced. The car had by that time about 105000km on the odo.
Yesterday the CEL-light flashed, I think 3 times. I immediately plugged in my code-reader and checked why: P0304=Cylinder 4, misfire detected was pending. I suspect this red powder is back...

The car is a Impreza 2.5RS MY2002 and has now about 114000km on the odo.
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Old 04-13-2009, 12:21 PM   #2
Scooby Guru
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
96L Most Over-
Developed Beater


It's clutch dust from the AC compressor. See also: nothing to worry about.

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