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  #1  
Old 08-26-2007, 01:02 PM
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Diagnose this sound

I've got a weird sound I need diagnosed if anyone has any insight.

The sound is like a hissing, sorta' what a closed EBPV sounds like through the exhaust and inside the cab. The sound I'm hearing is not very loud but enough to hear in the cab and a little outside the cab. Just noticed it recently. Sound doesn't get louder or quieter with different RPMs, constant with light throttle/no throttle. The sound does not effect how the engine runs, it's just another sound.

The sounds seems to be dependent on two things, either the gears I'm in or RPMs/Load. When in overdrive when the RPMs drop I can barely hear it - if at all, and once the turbo spools you can't hear it.. drive the PSD up to 35-40 without overdrive on, lift your foot off the go pedal and it sounds like the EBPV is closed. Seems to be coming from the firewall area, not too sure. Also, if I'm in motion and throw her in neutral the sound goes away or gets to where I can't hear it.

I've looked through the exhaust, no black soot leaking past - nothing on the firewall. Downpipe clamp is tight.

I even put compressed air up to about 5PSI (reading from the boost gauge incab) through the whole CAC system and could not duplicate the sound. I re-torqued every CAC boot clamp just to be sure, checked the plenums clamps. I checked the compressor wheel on the turbo, no play. Air filter is new.

I've unplugged the EBPV, went around the street, still there. Could the flap still mechanically be sticking somewhat shut? I unplugged the wastegate hose, still there.

The truck itself does not shift, or act different. Power is still there. At idle, can't hear anything. In short, there is nothing physically from my sense of feel different except for this sound.

Change gears from Park, to Neutral, to Drive, or Reverse to Neutral - whatever, you can hear a faint sound before it actually goes in the specified gear that reminds me of the constant sound I described.

Anyone have any ideas? I'm stumped. I thought about driving down the street without the accessory belt on. How do you check if the wastegate is stuck open? I assumed taking off the red hose would figure that issue out.

Maybe it's normal and I'm paranoid but I swear I never heard it before! Could a pulley make this sound? Specifically my mind keeps telling me to look at the AC compressor, I've had the AC on through this whole time for the most part.

Thanks, sorry for the long post, everything should be crystal clear though.

Last edited by Lord Tauk; 08-26-2007 at 01:19 PM.
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  #2  
Old 08-26-2007, 04:24 PM
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Dang no posts since 4:00? Wish I could help ya out Dave. Sorry.
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Old 08-26-2007, 04:45 PM
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I'll figure her out! For all I know, it's nothing.

I may need to get a second opinion though just to feel better.
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Old 08-26-2007, 04:58 PM
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Reach under the turbo if you can and see if you can move the actuating arm. Not sure if you can but you can disconect it and see if it moves freely. If I remember right it just has a slide clip.
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Old 08-26-2007, 05:01 PM
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Here is a pic of my old pedestal. If you look on the actuating arm you can see the clip Im talking about just slide it back and unhook the arm.
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Old 08-26-2007, 05:02 PM
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Edit: Pic helped.

however, as I stated earlier.. wouldn't just pulling the red hose off the wastegate imply that if it's stuck open or not since that is taking it out of the equation from allowing the "engineered leak" that it does?
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Old 08-26-2007, 05:03 PM
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Oh sorry Im talking about the ebpv.
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Old 08-26-2007, 05:06 PM
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lol

Makes sense now.
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Old 08-26-2007, 05:09 PM
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Its possible you have a week spring on the wastegate actuator. One way to check is to see if you can pull the rod as the spring is pretty stiff and see if it gives any. And that round thing on the bottom of the pic with the rod is the wastegate actuator for a lack of the real term in my head! lol
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Old 08-26-2007, 05:32 PM
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I didn't get too much into it as nothing appears to be wrong. Looks like I'll take a look at the things you mentioned and then go from there.

I parked the PSD to put miles on something else for now, not because of the sound issue - figure I get me some notes gathered and go at it when I get back to her, most likely I'll mess with it this coming up weekend.
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