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Chevy/GMC Duramax 07.5 -10 LMM Discussion of Chevy and GMC Trucks with LMM Duramax Turbo Diesel Engines

howling whinninng under hood

   
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Old 03-15-2015, 01:52 PM
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Default howling whinninng under hood
guys have 07.5 lmm dpf delete pcv reroute.got on light acceration what i call a howling whistle under hood .more dominant wen cold.and some boost ..im familar with turbo whinne.this is different.any ideas????
 
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Old 03-22-2015, 01:11 AM
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Are you sure it is not the engine fan? Those things can howl badly when starting up in the morning while cold.
 
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Old 03-22-2015, 12:55 PM
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no actually im not sure is not fan.i can tell when fan is engaged.thats just lots blowing
air.this is like a howl
 
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