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1999 Ford Expedition Sucking sound on the intake

It is a 4.6L. When you get on it or let off it goes away, but at idle and cruising you here a constant sucking sound. It also makes a loud sucking noise when you shut it off. Sometimes at idle it will flux between 500 and 1000 rpm. I have checked all of the vacuum lines and they are good. There is a sensor on the top of the intake, it has a slunger in it and is electronically controlled. I'm not sure what it is, but when I unplug it the problem increase 10x. I don't know what this part is to know if it could actually be the problem. I know I need to change the egr, but I have tried unplugging iot and the engine does not change its performance.

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Posted on Jan 02, 2017

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SOURCE: 99 ford expedition 4.6 misses / egr? vacuum?

it's getting to much egr the egr has gone bad and needs replaced.
the diaphragm in the egr is leaking, and default position for air is when you hit 3000 rpm you don't have enough vacuum.

Posted on Apr 30, 2009

  • 61 Answers

SOURCE: I changed EGR valves, selinoid, sensors, and even

go to auto zone or someone with a scan tool to find out what codes are stored on the computer in the car

Posted on Jul 30, 2009

  • 1986 Answers

SOURCE: we keep losing power in our ford 2000 expedition

have you checked your alternator? the battery terminals should read 13-14V when the car is running. Anything lower and it's not fully charging your battery. Anything higher and it's overcharging and damaging your battery (reducing life)

Posted on Sep 10, 2009

  • 667 Answers


Remove the throttle body housing on the top of the intake, it is a 90 degree tunnel like small piece held by 4 small bolts, turn it over and look for two holes, these holes are for the EGR valve flow, they are probably plugged up with carboned crud, clean them out with the tip of a screwdriver if neccessary to remove all the crud, once its clean reinstall it and reset your check engine light, hope this helps, let me know

Posted on Dec 04, 2009

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1 Answer


Sounds like a vacuum leak. This will cause the idle speed to be high. Additionally most cruise controls are operated by vacuum pressure. Look around the intake manifold for disconnected rubber hoses. May have popped off from dry rot or stretched out etc. Find the vacuum leak and fix it, both problems should go away.

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System adative fuel too lean bank 1 and 2 1999 ford expedition when driving try to give gas it chooke back fire in air intake

Sounds like a vaccum leak or air intake leak. Check all hoses for cracks,cuts,ect. Also check all hose clamps. If this helps great if not I might have a few other simple things to share with you. Get back to me

Sep 13, 2010 | 1999 Ford Expedition

1 Answer

When I slow down and my engine will vibrate.

Rough Idle usually indicates a vacuum leak. You may have to feel along the lines that are routed in the back. My expedition has a small line that is routed from the PCV valve to the back of the intake where it goes from a small hard vacuum in to a reducer connection. This connection crumbled. The vacuum lines deteriorate over time. Some may not look bad, however they are like a sponge. sucking air the entire length.
I use a propane torch (not lit). Turn on the valve and trace the vacuum circuit. If you have a leak, the engine will rev up slightly when the torch passes the leak.

Aug 26, 2010 | 2006 Ford Expedition

1 Answer

99 expedition running lean and dying when at idle

Sounds like a vacuum leak. Look for obvious vacuum hoses broken,squished or off. Check at egr valve, dpfe sensor & solenoid. These are all common to go bad. If not obvious take carb cleaner with snorkel attached, spray intake manifold & hoses etc. If idle raises while spraying you located vacuum leak. The propelent in the can temporarily seals leak while its being sprayed. Be careful not to spray on wires or anywhere there is a spark.

Jun 14, 2010 | 1999 Ford Expedition

1 Answer

1999 ford expedition rough idle allready replaced o2 egr now what do i try

First, go to Autozone or Oreillys for a free scan. Then get a gasket for the airhorn to intake manifold. You need to undo the 8 bolts for the airhorn, remove the base gasket and clean any passages underneath.

When the intake manifold is dirty in that area you will get false EGR flow errors. Once clean it should idle better.

Dec 04, 2009 | 1999 Ford Expedition

1 Answer

1997 Ford Expedition - cruise control won't work. Need a diagram for the fuse block!Help!

Vehicles involved in the recall include the following:

1998-2002 Ford Ranger
1992-1997 Lincoln Town Car
1992-1997 Ford Expedition
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1993-1998 Lincoln Mark VIII
1993-1995 Taurus SHO
1999-2001 Ford Explorer
1999-2001 Mercury Mountaineer
2001-2002 Ford Explorer Sport
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1 Answer

99 Expedition, runs rough, won't idle, no power.

it could be two things a bad injector or a the intake gaskets are leaking

Apr 01, 2009 | 1999 Ford Expedition

1 Answer

Wont stay running

You may have a defective idle speed control valve. Clean it first.

Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Nov 13, 2008 | 1998 Ford Expedition

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