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2007 gmc envoy_denali
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55 Posts
Discussion Starter #1
07 Envoy 5.3, 222k miles. Rattling/clunking noise coming from engine. I pulled the belt and started the engine and the noise got worse, not a bad bearing. Intensity varies but it's loudest when first starting engine. Any ideas??
 

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2006 gmc envoy_denali_xl
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24 Posts
Sounds like you have valve-train noise. Dose the engine oil with Seafoam for the next couple of oil changes and use something like Mobil or high mileage oil. Also change at the 35% mark, I know it's early but it'll help.
 

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2006 gmc envoy_denali_xl
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24 Posts
I use NAPA full synthetic in mine because NAPA oil is direct pour from Ashland oil which is Valvoline. They have great sales every other month and you can get synthetic for the cost of regular name brand oil.
 
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