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Bank 1 Running RIch, Bank 2 is not.

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Pulled the plugs today after they've been in for about 10k miles.

All of bank 1 looks like it is running rich, the plugs are wet. The right tailpipe from bank 1 is sooty, and the left tailpipe is not. The soot returns in just a few hundred miles if I clean it off.

Bank 2's plugs appear in much better shape.

I have a hard time believing this is anything more than a rich condition? since it is affecting the entire bank.

Compression test was good, all within 5-10%.

For example, if this is caused by higher oil burn off in bank 1, it's hard to believe it could be leaky valve seals, scored cylinders, worn rings, etc. on the entire bank.

The only other thing I could think of is perhaps the AOS is dumping more oil somehow into bank 1 than bank 2???

Fuel filter was replaced 1 year ago with no affect. I also run fuel cleaner about every 2000 miles or so.

Thanks in advance for any advice or direction.

Pics in order of cylinders starting with 1 and ending with 6.

bank 1




bank 2




Edited by logray
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Hah! Good question.

I won't have an answer until I have the car back together.

The engine is out right now for various things. Cam pads, lifters, chains, gaskets, seals.

Once I have it back together I'll report back in, thanks for the quick reply.

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