Question about 2003 Ford Expedition

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New plugs,new coils,new hoses,still chugs - 2003 Ford Expedition

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V6 or V8?
How many new coils and why?
Hoses have no bearing on drivability issues.
Any vacuum leaks?
Converter partially blocked?
Mil Light on dash and if so what codes are present?
Any codes previously,last year or two.
Shifting okey and tach doesn't flair or hang on shifts?
Clean Air Filter and Gas Filter?
Disconnect EGR Valve,plug hoses and test.

Posted on Aug 04, 2010


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1 Answer

How do i fix a rough idle

High is normal, as the cold engine has thicker oil and does not vaporize fuel well, so needs to run faster until it warms up.
But the rough chugging sound could either be weak spark from arcing wires or coil packs, or could be a lean mixture. Lean mixtures could be from a stuck EGR or purge valve, that you can test by temporarily plugging them off. Or from a leaking hose that fell off, that you can try to pinpoint by listening for the hissing. Or low fuel pressure that you can test for with a fuel pressure gauge. A dirty fuel filter could cause that.

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first, start with changing the vacuum hoses. if that doesn't work, move onto a system cleaning, they clean your lines and your carbirator. that fixed mine for awhile. but i also but a new manifold in it as well. but if none of that fixes it im not sure. mine is chugging as well right now, i think it is the air filter and spark plugs and wires.
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You can go to and register for full free online repair manual.

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