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  #1  
Old 10-24-2013, 05:31 PM
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Weird sound comes and goes, looking for advice

I have a weird sound that comes and goes... It sounds like a howling / kind of metal scrapping, the sound increase as rpm increases
It just started throughout this last week and it starts this sound at start up and then will happen until you drive for like 5-10 minutes then goes away - other times it doesn't show up at all
It only does it after sitting for an extended period of time so when I start it up to go to work or when I leave work and it's been sitting for 8 hours
I'm thinking it's either a turbo issue? Or the clutch fan

Here's a list of things I've changed in the last year and a half while fixing other issues
Upper and lower ball joints
Fuel filter
Oil
Serp belt
Both batteries
Idle validation switch
Glow plugs
Injector o rings
Starter
Starter solenoid
EOT sensor
ICP
IPR
Carrier bearing
Blower motor resistor
Greased front end
CPS
Brake line
Fuel line
Belt tensioner
Idler pulley
Water pump
Thermostat
Exhaust back pressure sensor
Brake pads n calipers
Hpop lines
Transmission range sensor
Power steering lines
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  #2  
Old 10-24-2013, 05:33 PM
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Are there bearings on either the exhaust or compressor wheel or somewhere else inside the turbo that could start seizing up with the colder weather - aka the problem is just starting to show itself
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Old 10-24-2013, 05:37 PM
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I just also tried spinning the fan and it spins fine by hand so I'm assuming my fan clutch is fine...
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Old 10-24-2013, 06:33 PM
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One other thing at WOT no noise.... As of now
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Old 10-25-2013, 09:00 PM
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After doing more research I'm thinking possibly the ebpv, I've heard of some people saying they have had a hissing sound due to the ebpv getting stuck? Any thoughts

Obviously until I take the turbo off for inspection I won't have some answers but I'm looking for thoughts as of now
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Old 10-25-2013, 10:34 PM
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It could be the ebpv. If you have a straight pipe and the weather is chilly it makes quite the noise when engaged. Quite annoying. You can unplug it underneath the turbo without any problems and it will go away
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