| it is supposed to be loud when cold...that is the way it warms the engine up...it puts a drag on it. 45-50 is way too warm to have a winter cover on...the engine was probably starting to get a little warm with the cover on. Mine does the same thing...it always has.
__________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust
TST Powermax Programmer, Diablosport Predator
285/75-16 BFG T/A KOs, Eagle Alloys Series 187
Clifford 2 way remote start, High Idle, Bilsteins
Extang Classic Platinum Tonneau Cover
AFE Magnum Force Stage 2 Proguard 7 intake Kennedy Diesel Merchant Automotive My Photos |