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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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4 Suggested Answers

juggernautxt
  • 145 Answers

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 defrost.so 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

moparownr
  • 667 Answers

SOURCE: 1999 FORD EXPEDITION 2WD 4.6L EGR VALVE,EGR

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

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

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1998-2002 Ford Ranger
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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

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1 Answer

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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.

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