Not the usual diesel knocking - 3.0L Duramax LM2 Diesel I-6

Glenn Davis

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I am having the same issue. Sometimes the exhaust smells different to me when its idling. Last night I was at a traffic light stopped and I felt a bang and then again. I watched my tach and noticed with the bang my tach dropped almost like it was missing. It didnt throw any codes but I am very concerned for a $73,000 truck to be sounding like this with 18,000 miles on it. I will keep following this thread.
 

ShineRunner

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I am having the same issue. Sometimes the exhaust smells different to me when its idling. Last night I was at a traffic light stopped and I felt a bang and then again. I watched my tach and noticed with the bang my tach dropped almost like it was missing. It didnt throw any codes but I am very concerned for a $73,000 truck to be sounding like this with 18,000 miles on it. I will keep following this thread.
Mine is going in tomorrow, I worked for GM for 10 years.. my diesel tech is telling me it’s common for these to have lifted issues and timing belt issues that can cause this noise
 
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