Just incase this hasn't been posted before.


http://service.gm.com/gmtechlink/images/issues/may04/TLmay04e.html



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<TD vAlign=top align=left height=26>Loose Crankshaft Reluctor</TD>
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This information applies to 2001-2004 Chevrolet and GMC C/K and MD C 4/5 trucks equipped with the 6600 Duramax LB7 Diesel Engine with rough, unstable, incorrect idle speed or stall.

After completing the published diagnostics for an engine stall or misfire with no trouble found, and the data indicates intermittent high balance rates on random cylinders, check for a loose crankshaft reluctor.

To inspect the crank reluctor, remove the right inner fender, crank sensor, and crank sensor spacer. Use a blunt probe and try to move the reluctor clockwise or counter clockwise. If the crankshaft reluctor is found loose, repair by replacing the necessary parts and be sure to include the alignment pins.


- Thanks to Jack McVoy</TD></TR></T></TABLE>