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Cat or not?
I pulled a ticket Monday that said "valve noise on cold start and check engine light on with no drivability concern." The only code is a P0420 and the "valve noise" is a leak at the exhaust manifold to cylinder head. I can see the cat is working reasonably wel... Login to read more. 
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| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2002 Chevrolet Silverado 1500 LS 5.3L
| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
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