Question about 2002 Ford Taurus

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Have a 2002 ford taurus 3.0L 24 v dohc engine.. hear a hissing sound when the engine is running, sounds like a vacuum hose is either cracked or has come loose. the engine light has also come on. I am trying to locate the vacuum hose that works with the fuel system, since I smell fuel when we shut the engine off,

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Geo P

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Do you have a small propane torch? or a can or throttle body cleaner or anything similar? Spray the propane(Just the gas, do nit light it) or throttle body clean, slowly around the engine and if there is a vacuum leak the rpm will rise when the propane fumes or throttle body spray gets sucked in and you know it will be in that area. Anywhere from the front of the motor to the sides to all the way behind, it might not be a vacuum hose, could be an intake manifold leak. Smelling fuel when shutting off can be a different problem all together.

Posted on Dec 21, 2017


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Richard Scordino

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SOURCE: A very rough idle and hissing intake sound was

I'd just plug it...If it's important, something will show up as not working, then you can connect it!

Posted on Mar 07, 2009



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i believe its 4 1\2, so put in 4 1\2 and then start it -shut it off then wait for a few minutes then check it,then add a little at a time to fill up if needed,DO NOT OVER FILL IT,not even a little bit,the seals will eventually start leaking,and it will build up with carbon in the intake system.

Posted on May 09, 2009


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SOURCE: ford taurus v6 duratec vacuum hose diagram

under the hood is a vacum diagram

Posted on Apr 16, 2010


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SOURCE: cannot locate the dpfe sensor

cannot find dpfe sensor on 2001 focus

Posted on Sep 24, 2010


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SOURCE: 2001 Ford Taurus coughs and

I can't solve the problem for you, but I can definitely tell you that it is NOT the fuel filter. I just replaced mine, and it's still doing the same thing, a full day after replacing. Looks like we're in the same boat. I'm changing the spark plugs next. Maybe we can help each other out here. What's your next move?

Posted on Nov 17, 2010

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1 Answer

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Sounds like a vacuum hose has come off or has a hole in it. Check my "How To" for checking for a vacuum leak.

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If it just dies, sounds like the Idle Air Control Valve. If it surges and runs rough, sounds like a vacuume leak, especially if it is the DOHC 3.0L engine, they have several vac hoses that go bad.

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1 Answer

Misfire code P0301 2000 Taurus

Hi Sue,

Chances are when making your hose and tstat repair, you probably bumped a vacuum line enough to either create a tiny crack or knock off a line. First, you can just check all of the vacuum lines that are near where you worked and then all of them using the emission and vacuum diagram/sticker located either on the underside of the hood or above the radiator. The vacuum lines all originate from the upper intake manifold, which is the big multi-tube looking large thing on top of the engine. Unfortunately, if the leak is a small crack or slightly loose connection, they can be hard to find. If no luck, try listening to the engine with it running for a hissing/sucking.sound. If you have long hair be careful. Still no luck, if you have carb or similar cleaner, maybe WD40, or starting fluid, spray it carefully and precisely around the engine listening for the engine sound to noticeably change. That will be at the point where you have a vac leak that will need fixing. An alternative method that I like is to take a small diameter hose around 3 foot long (a short piece of garden hose, heater hose, fish tank hose, etc.) and use it like a stethoscope to listen around to pinpoint a hard to hear and pinpoint leak.

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