ford engine issue

[Squirrely]

what would cause an engine to make a psst-psst-psst-psst sound, in rapid succession. Sounds like air escaping. It's only sometimes and under moderate pedal while driving... this doesn't happen in the driveway.

 

I'm working on a 5.4 triton and I've never heard this before. The only thing I can find online says turbo flutter.... there is no turbo.

 

 

but this rig is an 05. with a tuner.

 

 

Anyone have any ideas other than, "it's a ford, what did you expect". And I did post this on a ford site, no responses yet.

 

thanks all

[Wolfmanjohn]

Exhaust manifold leak?

[Squirrely]

I've heard those before and they kinda sound like a lifter tick... but still a possibility.

[Wolfmanjohn]

Manifold outlet to cat pipe inlet coupling gasket leak?

[Squirrely]

interesting. I will have to check later today.

[MikeNH]

What type of truck? The 5.4s in the Super Dutys were known to have exhaust manifolds go because they're exposed to the elements and make a sound like you describe.

[Badbird2000]

not sure if the cam phasers cause that sound or not. I would go with manifold exhaust leak.

 

not sure if the cam phasers cause that sound or not. I would go with manifold exhaust leak.

[BlackZ71Silverado]

Definately sounds like an exhaust leak.

[Squirrely]

it's a F150 .90K miles.

 

This is the motor with the plug problem, so that will be looked at also.

 

 

I'll dig into it more tomorrow. Thanks for the advice!

[Badbird2000]

Good luck with the plugs if you change them. There are several sites (ford f150) that cover tips on how to change them without snapping them. Good luck!

[EX-F150 owner]

it's a F150 .90K miles.

 

This is the motor with the plug problem, so that will be looked at also.

 

 

I'll dig into it more tomorrow. Thanks for the advice!

 

 

Plugs have been an issue on these trucks since 1996 lol. That was my first thought but not after you said this is a 2005. Unless someone has already changed them and one is coming out from not being torqued right

[MikeNH]

1997-2003s would blow plugs out if improperly installed (this was unfortunately easy to do). 2004+ they added threads to prevent this but after that the plug would snap off sometimes. Two separate issues.

[Squirrely]

Yeah, I'm not digging the plug thing.

 

I'm not dealing with it myself, someone else can pull them out. Still can't find an exhaust leak so I'm gonna have that looked at too.

[Squirrely]

It's an exhaust leak. Took me forever to find it. Sounds like it is from the passenger side manifold... It would onyt tick for a couple seconds then go away, and then it makes that air sound while under load.

 

It was just luck that I found it

 

 

Looks like a visit to an exhaust shop is in my future.