Front 4 Intake Runners Filthy?

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
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gainesville
The front four intake runners are full of carbon and soot while the rear 4 are fairly good looking. Is this an o2 issue? I've had a rich condition that I've been unable to completely cure. Not throwing any codes for the o2 sensors, but I'm stumped as to why exactly half of them are clean. If they matched up with either of the heads that would give me at least a starting point, but they do not.
 
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No takers? Here's a couple of pics to show the difference. Almost like the front cylinders weren't even firing....
IMAG0115.jpg
IMAG0115.jpg
IMAG0116.jpg
 
How is your PCV routed? If the vac like connected to the front and rear of the plenum? Some intakes have it connect to both, and some only to one. This could be part of it as well