Chevy and GMC Duramax Diesel Forum - View Single Post - Rough Idle (with video)
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post #2 of (permalink) Old 12-10-2019, 06:08 AM
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Join Date: Apr 2017
Posts: 303
Did your LLY not come with a high idle from the factory? My factory high idle brings RPM to about 1200. Are you able to change yours to that? It might just be 850 RPM is not a good one to set the idle to. I also don't think 850 is going to help it heat up much. The engine needs to be under some load to generate heat, not sure 850 is enough of a load.

Do you have a factory exhaust? Mine sounds nothing close to that raspy, it's more mellow with a slight hint of the turbo whistle at 1200 RPM.

My engine bay is noisy, but not raspy, it's also a consistent mellow sound.

2005 LLY 3500 CCLB 215,000 miles
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