Inventory Upgrade - High Engine Oil Consumption

**** This Inventory Upgrade is in effect until April 30, 2006. ****

On certain 2006 model year Chevrolet Optra model vehicles, equipped with a 2.0L Family II (RPO L34-VIN Z) engine, there may be excessive engine oil consumption.

Dealers are to inspect the PCV valve and, if necessary, replace the PCV/camshaft cover assembly.

Perform this service procedure on vehicles in dealer inventory that are listed on the attached VIN list and in the GM Vehicle Inquiry System (GMVIS).

2.0L (L34) Engine Positive Crankcase Ventilation (PCV) Orifice Restrictor Inspection

1. Remove the PCV hose (breather tube) from the camshaft cover.




Important: If it is difficult to determine if the PCV orifice restrictor is installed, use a 3 mm (1/8 in) drill bit (arrow 3) to check the hole diameter of the PCV orifice restrictor. The 3 mm (1/8 in) drill bit will not fit into a 2 mm (5/64 in) PCV orifice restrictor hole. If the 3 mm (1/8 in) drill bit fits into the PCV hose stem, the PCV orifice restrictor is missing.

2. Inspect the PCV hose stem (part of the camshaft cover) to determine if the PCV orifice restrictor is installed and installed properly. Refer to the illustration to view an example of a (arrow 1) properly and (arrow 2) improperly installed PCV orifice restrictor. Weld flashing is present on a properly installed PCV orifice restrictor (arrow 1). No weld flashing is present on an improperly installed PCV orifice restrictor (arrow 2). The PCV orifice restrictor will not be firmly attached to the PCV hose stem if it is not properly installed. The ‘arrow 2’ picture also illustrates a loose and protruding PCV orifice restrictor.

Notice: The purpose of this step is to ensure that the PCV orifice restrictor is welded firmly in place. To avoid damaging the PCV hose stem or the PCV orifice restrictor, do not apply excessive force when attempting to remove the PCV orifice restrictor from the PCV hose stem.

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If it appears that the PCV orifice restrictor is installed properly, use your fingernail to attempt to remove the PCV orifice restrictor from the PCV hose stem. Refer to step 4 if the PCV orifice restrictor is welded firmly in place. Refer to step 3 if the PCV orifice restrictor is not welded firmly in place.

•	If the PCV orifice restrictor is missing, proceed to step 3.

Important: The camshaft cover (P/N 92067571) is available in parts inventory. Ensure that the PCV orifice restrictor is installed properly before installing the new camshaft cover.

3. Discard the old camshaft cover and install a new camshaft cover, P/N 92067571. Refer to "Valve Rocker Arm Cover Replacement" in SI.



4. Mark the PCV hose with paint or marker to show that the PCV orifice restrictor has been inspected.

Important: It is estimated that only 6% of involved vehicles will require the PCV/Camshaft Cover replacement. Please order parts accordingly.

This correction should be performed on all vehicles currently in your inventory that are included in the VIN list contained in the Dealer Communication (Canada), and in the GM Vehicle Inquiry System (GMVIS), prior to sale or delivery.