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Why is my 98 expedition is runs rough - 1998 Ford Expedition

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Time for a tune up

Posted on Oct 02, 2009

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2 Answers

Where is the egr valve on a 99 Ford expedition


The EGR valve is in a very difficult spot to work on. If the EGR is bad it will set off the check engine light and make the vehicle run rough or stall at idle. It really doesn't make it run rough while driving or accelerating. What are the conditions when the car runs rough?

Mar 01, 2014 | 1999 Ford Expedition

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Spark plug and ignition coil problems.... plugged cat?


romove poping plug start engine if thier is major air pressure coming outyou have ahole in your piston replace piston overhaule kitand new piston possible thred damage on head,replace cat,and get a dog:) good luck.

Feb 22, 2013 | 1998 Ford Expedition

1 Answer

My 2002 expedition runs perfect since I bought it new until 2weeks ago. it started to drive rough, very rough. My obd says cylinder #6. Since I had 85k miles on it. I had replaced all COP, all Injectors,...


it sounds like you might have a blown head gasket ,you need to check the cylinder compression to verify. all cylinders should have 150 pounds of pressure or more if not this will be your problem.

Feb 13, 2011 | 2002 Ford Expedition

1 Answer

Rough idle on 98 ford expedition 5.4 ltr 4wd.


check to make sure there is no anti-freeze under the intake manifold and there is no vaccum leaks and the air filter and the fuel filter is not clogged give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your SUV wish you the best of luck Michigan Man.

Mar 25, 2010 | 1998 Ford Expedition

2 Answers

Expedition running rough on acceleration, it's a 5.4L.


running rough means it is misfiring.does it run smoothly without load or at idle?If it does then better check you fuel pressure as the engine needs more fuel under load.

Jan 21, 2010 | 2003 Ford Expedition

1 Answer

My 98 expedition will crank right up and run at a


high idle it may have a big vaccum leak that could cause the whole problem check all vaccum lines for cracks, collapsed, or off

Oct 21, 2009 | 1998 Ford Expedition

1 Answer

98 EXPEDITION, 5.4 LTR. RUNS ROUGH AS HELL IN PARK. A LOT OF VIBRATION.WANTS TO STALL UNLESS REVVED HIGH. DOESN'T WANT TO GO INTO REVERSE OR DRIVE, BUT IT WILL MOVE A LITTLE AT HIGH REVS. HELP PLEASE, IT'S...


you truly need to have it serviced and im sorry to have to say that however it could be a sensor or the transmission itself look for vacuum lines that may be rotted or a plug that had disconnected but this sounds like you need professional hands on repair

Sep 09, 2009 | 1998 Ford Expedition

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

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