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What is your question?
This is a ongoing ticking sound never stops for a 2002 GMC ENVOY. There's no check engine light on just service 4 wheel light
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Hello, you'll have to narrow down the noise to it's physical source -- under the hood? From the engine? Top of the engine? Bottom? Fuel injector ticking? Valve ticking? Engine knocking? Hands - ears on inspection is needed. www.repairpal.com/repair-shops