Quote:
fritz said:
Quote:
MMD said:
...... one half of the engine is combusting differently from the other half.



That is just your assumption, based on soot deposits.

Why don't the lamda sensors and ecu "correct" combustion, if it is really different left to right?

You are prepared to blindly accept that soot deposits are more reliable than your lamda sensors?

Have you considered the possibility that more soot has collected on one side than the other due to miniscule differences in surface roughness / polish of the exhaust pipes?

Would you be very disappointed if you were to learn that you are worrying about nothing?



Good work, you may be right. However, I found that the PCA Tech Q&A site contributes this tidbit:

Q:
I'm getting heavy black soot on the right exhaust only. It's bad enough to coat that area of the body near the right exhaust pipes. I'm not noticing any smoke. I've broken the car in carefully. Oil consumption is exactly 1 QT/1000 miles. I've added 3.5 QTs in 3500 miles. Any recommendations or thoughts as to the cause?


A: You might be using oil only in maybe one cylinder on the right bank and that is giving you the black soot on the exhaust. Wait until you have about 6000 miles on the engine and see if the soot goes away after the engine breaks in. If is doesn't, I would do a cyl leakage check on the right side. There might be a ring problem there

Peter Smith - PCA WebSite - 8/8/2005