Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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James,The common caused for these lean codes to set on the ECO engine is usually caused by the non-return valve (built into the intake manifold) damaging the PCV orifice diaphragm (built into the camshaft cover). The fix which is very common is to replace the Camshaft valve cover. You can check this with the steps in the link below. Check this and see if in fact this is your cause.https://dl.dropboxusercontent.com/u/104923897/Cam%20shaft%20cover%20Oct%2011.pdf
The line is the PCV line. See it in the link below.https://dl.dropboxusercontent.com/u/104923897/PCV%20Oct%2011.pdf
See if the service bulletin will help you as it is also related to replace the camshaft cover due to this leak. The place you need to check for leaks is at the PCV valve where it connect at the Cam shaft cover.https://dl.dropboxusercontent.com/u/104923897/PCV%20Noise%20Oct%2011.pdf