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  #1  
Old 10-02-2013, 01:50 PM
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Turbo Hissing...

I have read a few threads on here regarding this problem but I am not sure where to look for leaks or how to.

I am hearing a hissing at 8psi all the way to 25psi and even a whistle now. It seems to be coming from the driver side under the hood. I know the turbo is kind of oriented on middle slightly turned to the driver side. My trucks has a blue spring mod done by previous owner but this hissing is recent. I have messed with the air filter and have done a few oil changes but that is it. Could I have loosened something fumbling with that big air box?? It can be a bear to get in and out...

The CAC pipe looks like it has been patched and has some oil/grime on it, but sure sounds like the hissing/whistling is driver side.

Where would you start?
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Old 10-02-2013, 02:23 PM
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It might be a boost leak, but it could be an up-pipe leak as well. Since you have good boost numbers it may be difficult to find. The easiest way is feel for it while it is cold. At night you might be able to see it with a flashlight, looking for smoke or steam. Obviously, you will need some boost on it, so be careful. On the boost side, look for loose seals and cracks. On the exhaust side, look for soot deposits.
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Old 10-02-2013, 02:27 PM
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Thanks! I will try the night thing and see if I can see anything. Maybe a helper doing gentle power braking (with me standing on something next to the truck) will give me enough boost to get somewhere.

Boost side is the passenger, exhaust side is driver side, correct?

Last edited by TxOutlaw; 10-02-2013 at 02:32 PM.
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Old 10-02-2013, 05:39 PM
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Just went through a lot of hair pulling and internet searching with what sounds like exactly the same problem. Before you risk your life with a buddy power braking etc. do this: Pull your air cleaner off and look for a small hole in the cold side cac tube directly under the air cleaner. If you have a plastic corrugated tube directly under the air cleaner chances are the air cleaner has rubbed a hole through it.
Mine had a small hole that I used silicone glue to seal as a temporary fix. It was fine for a while until I needed to haul a fairly heavy trailer. The silicone blew out after a few dozen miles on the highway, after which I used a piece of duct tape over the silicone and a few layers of electrical tape over that. I reckon that'll hold until I can get ahold of one of the older model all metal cac tubes in the next couple of weeks.
Good luck, this one had me nuts for a while.
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Old 10-03-2013, 05:23 AM
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Thanks! Yeah, I will pull the air cleaner out and check under there... Like I said, I have removed it a couple of times to get the dust out of the air cleaner, maybe something wiggled loose or a hole has rubbed in...

Thanks again
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Old 10-03-2013, 06:07 AM
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Yep, KP nailed it!

I had 2 hair line cracks in the tube under the front of the air box and oil all over the bottom and front of the air box...

Got it glued and taped; I plan to replace that tube and the other side tube soon. hope the glue and tape holds for a week or so!

Thanks!
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Old 10-04-2013, 05:04 AM
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Glad that was it! My silicone and tape job has held up pretty well so far with some fairly high boost numbers hauling a trailer. Looks like Bulletproof makes an all-metal pipe that includes boots and clamps for around $160. I guess thats what i'm gonna go with.
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Old 10-04-2013, 05:28 AM
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Yep. I saw that too. XPD sells it also for that price. Lowest price to my door wins! LOL
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Old 10-14-2013, 05:54 PM
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Get with Sunrise Ford Parts...like $110 or so to your door. RiffRaff Diesel has them too.
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Old 11-14-2013, 11:55 PM
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is there some kind of trick to getting the lower end of the plastic pipe off? I have a metal tube i want to put back on but had a hell of a time trying to get the plastic tube off and ended up leaving it on til i have more time to mess with it
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