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So I have a 2002 lb7 with 296,000 miles on it. I have replaced injectors and vacuum pump. Before I purchased vehicle injection pump and glow plugs were replaced. I was cruising down the highway with cruise control set at 70 when out of the blue I hear what sounds like a pressure relief valve pop off then I hear what appears to be turbo noise/whine. Truck runs great no trouble codes, no smoke, everything seems normal just hear more noise or whine than before. I used to have a strong diesel smell at idle from exhaust now nothing. I am just wondering what the possibility of the EGR being plugged because vacuum pump was seized ( and I have no idea how long) and something finally freed up so now everything is working correctly or if my turbo may be going out.

2002 Silverado, stock, 296,000 miles
 

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Disposition?
 

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Thanks for the follow-up!

note to self: thorough visual examination.
 
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