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Old 07-08-2012, 05:27 PM   #1780
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2007 2.34LR, EFR7670
LINK G4+ hybrid STi


Originally Posted by dexterous View Post
I did find something of interest. The drivers side (the side with the blackened plugs) had extra fuel residue in the intake ports of the head when compared to the side that seems to work. This tells me that my problem is likely fuel related. The other side is a normal silver looking color:

Fuel alone would leave a clean surface not one with carbon deposits like that. Improper cam or ignition timing may cause combustion product to back up out through your intake valves creating that residue you see. At least that's my theory.
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