Quote:
Originally Posted by shadrach74
How does the engine read a "lean run" condition from a leak aft of the metered section of exhaust? There is no O2 sensor on the mid-pipe/secondary cat. The only leak the ECU would have the ability to detect would be between where the manifold meets the exhaust port or an actual hole in the manifold/header. I cannot understand your assertion that the O2 sensors are capable of sensing anything downstream of their positions...
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Shad,
We don't really know where his exhaust leaks are for certain. We have not seen them and he "may" have more exhaust leaks than he is currently aware of. We do know that an intake or nearby exhaust leak will foul the sensor readings and contribute to rough idle. Simple process of elimination. Fix the obvious thing you are certain is wrong and move on to the next. This is always more effective than changing out perfectly good parts.
