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Feb 16, 2014 | 11:14 AM

expensive_habit

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From: Emmett, ID

Please help

Hi, I'm new here and maybe you guys have already solved this problem... I have an 03 F250SD with ~145,000 miles on the 5.4L. Just recently I have been having what seems to be a miss, or possibly a dead cylinder. I thought it might be a dirty MAF, but I cleaned it and have the same problem. The miss is more noticeable at the higher RPMs. I am checking the plugs today. So anyways, has anyone come across this problem, and does anyone have a solution? I refuse to take her to the shop and having another man up in her manifold

Feb 16, 2014 | 11:33 AM

02TB250

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From: ALPHA ,NJ

Quote:

Originally Posted by expensive_habit

When is the last time you changed the fuel filter and plugs?

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Feb 16, 2014 | 11:37 AM

expensive_habit

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From: Emmett, ID

I changed the fuel filter about three weeks ago. I haven't changed the plugs since I bought it a couple of years ago. I know it's bad of me, but I've been really busy, and they are a bit of a pain cause of the fuel rails on top of the coils

Feb 16, 2014 | 12:33 PM

02TB250

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From: ALPHA ,NJ

You'll want to check the coils, and you only need to change then if they don't work. You'll want to change the plug boots.

You also well want to check the coolant and the oil to make sure nothing is up with them. A headgasket can cause misfire symptoms

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Feb 16, 2014 | 12:36 PM

Quad Racer

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From: Cincy area

My van with a 5.4 ran like that right before it blew a plug and also right before a coil went. Any codes to speak of?

Feb 16, 2014 | 12:53 PM

expensive_habit

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From: Emmett, ID

I'll defiantly check the coils, and change the plugs. I'm pretty sure it's not the head gasket, but I can test the compression. Quad Racer, the funny thing is that there are NO codes, When I scanned it all I got was a yellow emission light (fair).

Feb 16, 2014 | 01:03 PM

Uncle Phippy

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The first thing you need to do is run codes to find out which cylinder is misfiring. If you don't have a code reader, you can go to a parts store and most of them will do it for free. Once you have determined which cylinder is misfiring, simply change that cylinders coil with a coil from a cylinder which is not misfiring. Then drive the truck and read codes again. If the misfire moves to the cylinder that previously did not misfire, it is the coil. If the misfire remains at the original cylinder, it is most likely the plugs. It is not an easy job, changing the plugs. It took me six hours, however, I did a thorough job of cleaning everything, applying di-electric grease to the coil boots, and applying anti-sieze to the new plugs. Be sure to torque your plugs when installing them. Don't over tighten.