Question about 1999 Ford Expedition

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EGR Modual How do you know your problem could be the EGR modual and What is general repair costs. My 1999 Ford Expedition jerks (such as misfiring/ hesitation) as if the engine is not getting enough fuel.

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Try just simply replacing the fuel filter..10 bucks at a parts store..if that does not work and the ecu is messing up they can be pricy you might be able to get one from a junkyard..

Posted on Oct 27, 2008

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My 2000 Ford Expedition 4.6l had a manifold seal blown and was leaking fluid in the sparkplug sockets. Seal replaced and spark plugs changed, now I am having to change coil packs because Im getting...


Faulty EGR valves do not cause "false" misfire codes. An EGR valve that is not closing properly can cause misfires (and misfire codes) but they are REAL misfires when this happens.

To understand this, you need to understand what a misfire is and what kinds of things can cause them. It is a very LONG list and I do not have the time or space to get into all that here.

You will also need to understand this if you are going to properly diagnose your misfire codes without wasting a whole bunch of money on parts that you do not need. MANY things can cause misfires other than spark plugs and ignition coils.

I do not know what EGR code you are getting, but I will tell you that in the 37 years that I have been diagnosing and repairing cars, there has only been once that I can remember that I have ever replaced an EGR valve on a Ford engine because the valve itself was faulty. Most EGR codes on Fords are caused by either clogged-up EGR ports or a bad DPFE sensor. Every so often you will find a bad EGR control solenoid or a broken vacuum line, but it is extremely rare that the EGR valve itself the cause. With the exception of leaking vacuum lines and on certain engines, clogged EGR ports (Like the 6 individual EGR ports in the 4.2L engine), none of these causes for EGR codes will cause any misfires.

Also, most of the time when people pull the trigger on the ignition coils on the 5.4L and 4.6L engines, all the thing really needs is new spark plug boots. They get contaminated with oil and water and can cause carbon-tracking on the spark plugs and/or arcing into the spark plug wells instead of sending the spark through the spark plug. It is pretty much the same thing as having bad spark plug wires on a conventional ignition system. You don't throw the coil and distributor away on a conventional system because it needs new wires. Neither should you replace a coil on a COP ignition system that just needs a boot. Some auto makers do not make the boots available seperate from the coil. Ford at least had the insight to understand that people cannot afford the cost of replacing all of their coils just because the boots are defective.

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Check out EGR Valve. Disconnect vacuum hoses,plug and drive,to test

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Look under the steering column to the left.The moduel should be there with the keyless code.

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there is actually a modual that runs the lights... the lighting control modual (LCM) not saying this is for sure, but a good place to start. keep in mind if u replace the modual, you have to have it flashed(programmed) to the vehicle.hope this helps and good luck

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the control modual is usually under the pasenger seat, under neath the carpet. hope this helps you and good luck.

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