Question about 2004 Ford F150

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I have a 2004 f150. There is a hissing sound when the accelerator is pressed and also when the engine is cut off. It sounds like it is coming from under the dash around the gas pedal. Does anyone know

I have a 2004 f150. There is a hissing sound when the accelerator is pressed and also when the engine is cut off. It sounds like it is coming from under the dash around the gas pedal. Does anyone know what could cause this.

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  • 44 Answers

Is the engine running rough?

Posted on Nov 29, 2014

Testimonial: "Yes."

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SOURCE: 2005 Ford Escape Hissing sound

The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.

Posted on Jul 02, 2009

  • 10 Answers

SOURCE: 2004 Ford F150 4.6 has

if you hear air it could be a vacuum leak. check the intake manifold for any cracked vacuum lines. or your fuel injectors are clogged.

Posted on Nov 13, 2010

  • 76 Answers

SOURCE: Thumping sound coming from under

it sounds like you have a universal joint that has gone bad

Posted on Aug 14, 2011

  • 290 Answers

SOURCE: Why is my 2004 Ford Freestar engine rattles when I accelerate even after a tune up has being done to the engine?

Sounds like pinging or detonation. Try a tank of premium fuel. Check the engine for correct ignition timing

Posted on Oct 25, 2014

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