A little clak from 600-1200rpm isn't really that big of a deal. No IDI motor runs completely quiet. I have a 93 that runs perfect and it has a little clak and it starts in 5 degrees without any hesitation or smoke. How many miles? Let's see a video.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k