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Psst-psst engine noise

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Old Apr 28, 2012 | 10:28 PM
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Psst-psst engine noise
I have a 2005 F150, 5.4 triton. I bought the truck used and it came with an Edge tuner. It's lifted with 35's.

Under mild acceleration I get a psst-psst-psst-psst-psst-psst type noise. Sounds almost like air... It only happens in drive when you get on the gas and put a load on the engine but not always. It doesn't seem to happen if you mash the pedal...

I can't seem to replicate this sound in the driveway.


I've never heard this sound before. Any ideas?
 
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Old Apr 29, 2012 | 09:31 AM
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I've been searching the net and this site... the only thing I can find that sounds close is turbo flutter.

I don't have a turbo.


Any help please?

Thanks!
 
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Old Apr 29, 2012 | 06:39 PM
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anyone?????

anything?
 
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Old Apr 29, 2012 | 07:29 PM
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Its hard to tell from your description, maybe an exhaust manifold leak.
 
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Old Apr 29, 2012 | 07:35 PM
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I know the description is weak. It's similar to the cut off sound from an air pump. But they are short bursts...

Maybe an exhaust leak?
 
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Old Apr 29, 2012 | 07:49 PM
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Are all of your spark plus in place? Some of these motors had p problems where they would spit out the plugs. You may have one out of place.
 
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Old Apr 29, 2012 | 08:28 PM
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yikes. I hope it's not a plug issue.
 
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Old Apr 29, 2012 | 08:34 PM
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Maybe a vacuum leak somewhere
 
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Old Apr 29, 2012 | 08:51 PM
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I'll hit it with carb cleaner and see if I get a surge. The truck runs great, no noticeable power loss at all. Just the noise.


This is gonna have to be a tomorrow project.

Thanks!
 
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Old Apr 29, 2012 | 08:51 PM
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Most likely an exhaust leak.
 
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Old Apr 29, 2012 | 09:08 PM
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Try to figure out which side, it may be a manifold to exhaust pipe gasket. Se if you can tighten it up, or stop off at an exhaust shop for $20 bucks.
 
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Old Apr 30, 2012 | 11:21 AM
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Does it have an aftermarket air intake system? Mine with a k and n does it
 
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Old Apr 30, 2012 | 09:52 PM
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I'll know more tomorrow
 
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Old May 2, 2012 | 07:18 PM
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Originally Posted by brandonorban
Does it have an aftermarket air intake system? Mine with a k and n does it

interesting. Mine is stock however. I finally broke down and took it in. They couldn't find anything and told to not worry about it....

guess I'll put some louder exhaust on and ignore it.


I did have the shop change the plugs. Everything I've read about them had me uneasy. And, I hade water in the front diff.

As of today; all new fluids, new plugs, and no error codes.

 
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Old Sep 19, 2012 | 08:54 AM
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mine does this as well, only when hot. i'm pretty sure its an exhaust leak. im going to get it in, if they find anything i'll update
 
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