No power/ idle's rough, runs terrible, HELP

[mclay]

I looking for a little help please, I have an 03 expedition. Last month, my wife and I where driving down the road and al of a sudden heard a whistling sound from under the hood, sounded like a vacuum leak. The trruck began loosing power and ideling rough, We got home and I popped the hood and noticed the hose to the EGR sendor had cracked. I replaced the hose thinking everything was fine, but now it's doiung the same thing, it has progressively gotten worse. I pulled the code on it and replaced one of the O2 sensors, the one below the first convertor on the passengers side, no luck still running like crap, I had a buddy look at it and he told me that the caddilac convertor had gone bad. so just trying to get rolling I cut off the convertor on the lower passengers side to see, still no luck, I pulled the codses again and it P0306, I think, either way I replaced the cylinder #6, plug and COP, still no luck, the truck does not run at all, cranks fine, but still has no power, going to straight I can get about 30mph, slows to a crawling halt going up hill... Anyone have any ideas, I am at a loss..... PLease help

 

[limited4x4expy]

Have you checked fuel pressure at the fuel rail? Or have you changed the fuel filter lately? Could try cleaning mass air flow sensor?

 

[CARO'S98EB]

ditto on the fuel cks and also the cat convertor

 

[J20jeepster]

Any news on this? Mine is doing the same. I am replacing all the COPs and plugs today. It needed to be done anyway. I am worried that's not the problem since mine threw codes for 3 different cyl.

 

[02expi]

mine acted like that and it was the trans fuse #23 I think it's in the box under the hood and is in the front near the air filter end of the box.

 

[J20jeepster]

After replacing the cops and plugs mine is running smooth as silk. I found out all the plugs were original and some were cracked. Some of the cops were all rusted too. I guess after 130,000 miles a tune up is a good idea. Some times I wonder about the POs
Now for the Gotts mod!

 

[jeepfix]

Check out my post under the f150 forum. Look under jeepfix. If while its running rough and you have an excessive fuel smell, its most likely a stuck fuel injector. We have an 05 expedition with 100k. Ford has an extended service call on this covering 100% of cost.

 

[.45 ACP]

Cats

Had the same thing happen, had to replace both cats on the drivers side. Cost me $450 but cured the problem. Also noticed the a/c sopped when running rough.

 

[Tuff]

I looking for a little help please, I have an 03 expedition. Last month, my wife and I where driving down the road and al of a sudden heard a whistling sound from under the hood, sounded like a vacuum leak. The trruck began loosing power and ideling rough, We got home and I popped the hood and noticed the hose to the EGR sendor had cracked. I replaced the hose thinking everything was fine, but now it's doiung the same thing, it has progressively gotten worse. I pulled the code on it and replaced one of the O2 sensors, the one below the first convertor on the passengers side, no luck still running like crap, I had a buddy look at it and he told me that the caddilac convertor had gone bad. so just trying to get rolling I cut off the convertor on the lower passengers side to see, still no luck, I pulled the codses again and it P0306, I think, either way I replaced the cylinder #6, plug and COP, still no luck, the truck does not run at all, cranks fine, but still has no power, going to straight I can get about 30mph, slows to a crawling halt going up hill... Anyone have any ideas, I am at a loss..... PLease help

I had this happen to my 03 Expy with the 5.4. I had the P0306 code. I was swapping the #6 cylinder coil with my #5 cylinder coil to see if I had a bad coil and I realized the bolt holding the coil on #6 was loose and the connection where the bolt goes through had become corroded. I cleaned it up and still swapped it out with the #5 cylinder and it runs good as new.
Everyone should check this before investing $$$$ into costly parts and labor.

 

[rescuer3]

If you have already removed the rear cat, unbolt and check the front one. If you have had misfire or bad air/fuel mixture, the front will catch it first and that is the one you will lose. I had the same problem recently and ended up replacing the front cats and deleting the rears. Ordered the cats from Eastern and had a local shop install, total cost was $200. Like others have posted earlier, check your fuel system first( pressure, filter, leaking injectors) and clean your MAF and TB. Good luck and keep us posted on progress.