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Whenever I start my 1995 f350 up when it’s cold it sounds different l noticed that there is a butterfly under my turbo that’s closes and as l was driving it it kept closes and opens until it warmed up, is this Normal
 

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yes. not sure if a 6.7 does that but our older stuff does.
if you dont use a block heater for below 50, it will sound like its choking, rev up rpm, and just sounds like its dying depending on how cold it is.
 

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You can disable it (if you wish) by disconnecting the 2-wire weatherpack-type connector at the base of the turbo on the driver's side. That disconnects the solenoid that actuates the hydraulically-operated EBPV butterfly. I have always found the EBPV to be more annoying than useful for warmup. Cheers!
 
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