2007 Chevrolet Suburban C1500 Excessive Engine Oil Consumption

2007 Chevrolet Suburban C1500

Excessive Engine Oil Consumption (Verify Condition, Inspect Valve Stems, Replace Cylinder Heads if Necessary)

Affected Model(s):

2006-2007 Chevrolet Avalanche, Silverado Classic; 2007 Chevrolet Impala, Monte Carlo, Silverado, Suburban, Tahoe, TrailBlazer; 2006-2007 GMC Envoy, Sierra Classic; 2007 GMC Sierra, Yukon, Yukon XL; 2007 Pontiac Grand Prix; 2006-2007 Saab 9-7X; with 4.8L or 5.3L V8 Engine (VINs C, B, Z, 3, M, T, 0, V, C, J - RPOs LY2, L33, L59, LC9, LH6, LM7, LMG, LR4, LS4, LY5)

CONDITION:

Some customers may comment on excessive engine oil consumption. The rate of oil consumption described may usually be around 0.946 liter (1 quart) of engine oil in 805 to 1125 km (500 to 700 mi).

CAUSE

The engine oil consumption may be caused by a nick in the valve stem.

CORRECTION

Complete the current SI diagnosis for any DTCs or symptoms found. Refer to Corporate Bulletin Number 01-06-01-011C for Information on Engine Oil Consumption Guidelines.

If excessive oil consumption has been verified, all of the valve stems need to be inspected for damage. One or more of the valve stems may be nicked. After removing the valve cover, all the rocker arms need to be loosened to assure the valves are closed.

It is possible to see a nicked valve stem through the valve spring coil (a mirror and flashlight will be required), but in some cases the valve spring may need to be removed. Photos of a nicked valve stem are shown below.

Fig. 1: View Of Nicked Valve Stem (1 Of 2) Download File PDF


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