intake noises

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Feb 8, 2004 | 09:54 PM

flyguy2

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Joined: Feb 2004

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From: Arizona

intake noises

I have a 2001 f-150 4x4 supercab with a 5.4 engine. On exelleration I hear a sucking noise in the engine. I've been told by the dealer that it is air being sucked through the intake and that this is a normal noise. It can only be heard at low speeds with the windows closed. Is this type of noise normal with this engine? Thanks.

Feb 8, 2004 | 11:19 PM

LxMan1

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Joined: Dec 2001

Posts: 22,436

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From: Louisville,Ky.

Hi and welcome to the forum

I have basically the same truck and mine doesn't do that.
Jimmy

Feb 8, 2004 | 11:29 PM

czechyour6

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Joined: Oct 2003

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From: Central Utah

If it has an aftermarket throttle body, like 75mm then that might be it

Feb 9, 2004 | 08:42 PM

flyguy2

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New User

Joined: Feb 2004

Posts: 19

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From: Arizona

Thanks for the replies. This is the second engine for this truck and the first one didn't do it. If anyone has any ideas where I might look I'd appreciate it. I do know that with all the plastic on the engine that any noise would be magnified.

Thanks Again

Feb 9, 2004 | 09:32 PM

LxMan1

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Joined: Dec 2001

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From: Louisville,Ky.

I would look into the air filter assembly and the air intake tube, It sounds like it may be leaking air somewhere.
Also, just for kicks, check the PCV hose assembly for cracks and a vacuum leak. Especially behind the throttlebody.

Jimmy