hocka09
10+ Year Contributor
- 140
- 4
- Aug 8, 2010
-
Macomb,
Michigan
Hey Tuners,
This one has me stumped, folks. I’m currently pulling apart an engine I’m swapping from one car to another for a freshening up and I came across a single exhaust port that has nearly no carbon buildup, while the others have what I consider typical buildup. I went ahead and pulled the plug on that cylinder and it looks a little light but not glazed or anything indicating a lean condition. Unfortunately, the engine was already out of the car otherwise I would have compression tested it.
A little history on the engine, it has a factory short block (~157,000 miles) and I pulled the head and had it completely rebuilt about 40,000 miles ago. I can’t say I noticed anything odd power/combustion-wise. Wideband O2 readings usually looked fine. Was basically running factory power on a 14b with ECUFlash tuning to get the fuel a little leaner (pig rich on stock cal).
My ideas are either reeeeeeally bad rings basically blowing by all combustion on that cylinder (no PCV oddities though) or clogged injector on that cylinder either completely shutting off fuel of causing a lean condition.
Any other ideas?
This one has me stumped, folks. I’m currently pulling apart an engine I’m swapping from one car to another for a freshening up and I came across a single exhaust port that has nearly no carbon buildup, while the others have what I consider typical buildup. I went ahead and pulled the plug on that cylinder and it looks a little light but not glazed or anything indicating a lean condition. Unfortunately, the engine was already out of the car otherwise I would have compression tested it.
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A little history on the engine, it has a factory short block (~157,000 miles) and I pulled the head and had it completely rebuilt about 40,000 miles ago. I can’t say I noticed anything odd power/combustion-wise. Wideband O2 readings usually looked fine. Was basically running factory power on a 14b with ECUFlash tuning to get the fuel a little leaner (pig rich on stock cal).
My ideas are either reeeeeeally bad rings basically blowing by all combustion on that cylinder (no PCV oddities though) or clogged injector on that cylinder either completely shutting off fuel of causing a lean condition.
Any other ideas?