Question about 2003 Ford F350 Super Duty DRW SuperCab

1 Answer

Lack of power using way more fuel and hissing by the firewall , i unpluged hose off wste gate box , pretty well same thing happening, maybe bit les power

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 75 Answers

One of your turbo boots or intake boots is off or has a hole in it! Could be either cracked or has come loose of the clamp. This is your hissing noise your hearing. It means the turbo is making the boost but it is not getting to your engine. Its leaking out the boot. No boost no power! Poor performance and bad fuel economy too. You need to check all of your boots and clamps. If you say it is by the firewall then start on the side that the hiss seems to be comming from. DONT unplug your turbo waste gate as you can damage your turbo or other engine components! your waste gate allows excess pressure not needed on your exhaust side to escape.

Posted on Feb 02, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi , my 2.8 td pajero 1994 has an acceleration fault.. It idles and revs fine but when acceleraiting up a hill there is a hissing sound from the engine bay and power drops. Any ideas P,EASE )


To me lack of power means Compression, Fuel, Spark.
Hissing sounds like Compression - vacuum leak--either a hose, valve, or gasket. Getting a code?
Should be able to take the vehicle to Autozone, Oreilly's for a free code check. Could be a sensor.

I hope this helps.

Oct 21, 2013 | Cars & Trucks

1 Answer

I think that the servo controlled temperature door is sticking in the closed position. We can turn the dial on the temp selector to warm things up a bit & no change occurs. After messing with the...

You are correct about the main blend door sticking friend. And it happens to cover the heater core part of the box under the dash on the passenger side. Look under the hood at the firewall and see where the hoses connect to the heater core. That's the position your looking for. Could also be just a tight bend in a vacuum line from the blend switch valve to the door itself. Everything to do with heat and A?C is vacuum actuated from a vacuum canister under the hood. A black round ball about 4 inches in diameter.

Jul 07, 2017 | 2005 Chevrolet Malibu

2 Answers

Need installation instructions for fuel filter for 1991 Honda Accord

put in neutrsl, jack up rear of the engine
release fuel pressure
use svivel socket to unscrew filter

Aug 16, 2010 | 1991 Honda Accord

1 Answer

Audi missing at idle, engine smoke, and vacuum leak

audi oil leaks are usually valve cover gaskets. oil run off causes smoke on exhaust downpipes.while vacuum hoses do tend to dry rot with time it may also be the secondary air injection pump (if cold ) or waste gate for turbo.try to use a long hose,put one end on your ear use the other to locate sound. extending mirror and light may help too. missing at idle could mean time for tune up or coil pack failing. good luck

Mar 23, 2010 | 2004 Audi A4

1 Answer

I think I have a timing issue. My car takes a second to start up and the car jolts when it changes gears. Also, my steering wheel shakes left and right when I'm driving at low speed


same car with the AC problem. Timing is not going to make this all happen.

  • If its jaulting as an automatic, through the gears, then probably check and change the fluid and the filter in the transmission. Usual jolting is from lack of fluid pressure, caused by lack of or blocked filter.

  • Start up could be anything from a weak battery to lack of fuel/choke. Try a new fuel filter, air filter element, check your oil and change the spark plugs.

(Symptoms of bad ignition timing are misfire and run on also extreme lack of power and rough idle. The car will also shudder and keep running a few seconds after the key is switched off.)

  • The steering shaking from left to right at low speed could be a few things. Is it only happening at low speed? Sometimes its hard to tell at high speed as it is happening so fast the frequency is almost unable to be felt. However when you brake it should be pretty strong if its a mechanical fault, ie disc warped or bent wheel.
#Check your power steering fluid and hoses for leaks

Mar 04, 2010 | 1995 Honda Accord

3 Answers

Brake hisses under the dash when i step on the brake pedal

this is caused by a defective leaking vacuum (that is the hiss) power brake booster diaphragm, replace the power brake booster.Use the link below for general instructions on replacing your booster, it is a diff car but the same type of part is on your car.

May 20, 2009 | 1995 Pontiac Grand Am

1 Answer

Accelerates rough/weak acceleration 2002Jeep GC

If you heard a hiss, that's probably what to look for. With your engine running, wiggles all your vacuum lines around, and try to find that hiss again. It will be a broken or cracked or loose vacuum line somewhere. A stethoscope, or a length of fuel hose held to your ear can sometimes help you find them.

May 03, 2009 | 2002 Jeep Grand Cherokee

3 Answers

Brake makes a hissing noice when depressed

It may be a few different things, most of them relating to the brake booster. It could be a vacuum hose is loose or ripped (a simple fix, just replace the hose) which would correlate to a hissing noise outside the car. If there is a hissing noise inside the car it could be a tear in the booster on the inside of the car (trace the brake pedal up, at an angle, and then into a rubber 'boot' or 'fitting'. This is called the firewall by some people. With the car running (but in park) feel the rubber boot and see if you feel any air releasing, or if the noise diminishes when you cover certain parts of the boot). A tear internally means you need to replace the brake booster itself in some cases. This is a bit trickier to pull off if you don't have the experience.

Here is a picture of a standard booster/master cylinder.

Another (DANGEROUS) option if the booster itself is leaking is to disconnect the hose from the brake master cylinder, and clamp it off/plug the hose. This is the equivalent of having manual breaks, and will require a lot of pressure to engage the brakes (normally you are compressed air assisted by the booster). The only reason to do this is if the tear is large enough that you are losing engine power because of it. This will allow you to get to the next exit, next gas station, or (in some cases) 3 states away.

Jan 26, 2009 | 1999 Jeep Grand Cherokee

2 Answers

19984 F150 Hissing Brakes

This noise is the seal for the power brake booster leaking, you will have to replace the vacuum booster to fix it.

Nov 12, 2008 | 1984 Ford F 150

Not finding what you are looking for?
2003 Ford F350 Super Duty DRW SuperCab Logo

251 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

79186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

5681 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides