I have a o1 5.4 that runs perfect when cold but as it warms up it starts missing (more than one cylinder) when pushing on throttle does not throw any codes have changed many items fuel filter,fuel regulater,have had it in the shop for a week now but not working yet any ideas would help. thanks

 

Update the coils and change the plugs, - use Motorcraft plugs.

It's a cheap fix that works. Coils are $76 + shipping, plugs should be around $32.

A good way to tell that it is indeed the ignition is to reboot the PCM. She'll run better for a short period of time, then fall back into the same slot as before,- gradually. Also, make sure that any part of your ignition harness isn't coming in contact with the AC acummulator. That mag field can create havoc with these ignition systems. Pull it away and tie it back.

 

you can use autolite plugs, there the same as the motorcraft plugs

 

Thats a lie. The motor craft plugs are made to fords specifications Autolite are not. There have been numerous reports of failures of Autolites on this board going back several years. do a search.

 

No their not. This is a "trol", we get them here every now and again. - Disregard this one.

Damn jethat! that was fast lol.

 

mi bad i meant to say there like the same, im not going to argue about anything

im not a troll!!!! so back off

 

lol, well, their not even close to being on the same level as the Motorcraft. They can't take the heat. Heat range doesn't meet spec for the 97-03. I guess that's why the SAME company makes Motorcraft for Ford. Their produced to Ford spec. Autolites come out of the reject pile.

Autolites aren't fast enough. A plugs net worth is in the speed with which they can transfer heat from the combustion chamber to the engine head. Autolites fail.

 

where do i get the coils for $76 cheapest i can find is $25 each thanks for your help.

 

http://cgi.ebay.com/ebaymotors/NEW-I...Q5fAccessories

 

thank you much.

 

just ordered some thanks

 

No problem