Hey Guys... Thank you for all the helpful info you guys keep on here. I've owned my 03 expedition (bought for my wife) for 4 or so years now and have referenced this site numerous times for help... Thank you!!!

The truck is bone stock other than aftermarket audio... Its a 2003 expedition EB 5.4 with 130ish k. Well maintained, and to this point, problem free. Purchased the truck from a local dealer, the truck itself was the owners wife's truck and well taken care of.

A few days ago, she got a CEL, and a very rough idle/ misfire (only in gear / with a tranny load) checked the code and had a misfire on cylinder 1 & 5 and failing DPFE (p1405)... checked the DPFE and one side's hose was badly worn/ cracked other broke off ... so, replaced the hosed and both coils and plugs.

I've owned my Lincoln ls for 6 plus years now and i'm very familiar with coil failures (unfortunately), seasoned member on LVC (any LS questions, let me know ) so i know all should have been replaced at once, but just wanted to get her running first and order the rest online... anyways, replaced everything, started her up, ran fine. started again, misfire/rough idle came back... so I replaced the DPFE, no luck. drove it abit more to see if i could get a code, finally got one with a cylinder 7 misfire... so this weekend i replaced all other coils and plugs (that was fun), took her around the block, Drove PERFECT, best it ever has... started it up the next morning, rough idle back.

-Only rough in gear (with the tranny load)
-would run smooth the first time after clearing codes and coil replacements (twice), but second startup immediately bad.

Ive read on some things it might be...

Dirty IAC
Clogged cats (seems odd it would run well the first time if this were the case)
bad EGR valve (possible)
Fuel filter (again, ran great the first time)

Anyone had a similar problem / advice....I hate to keep throwing parts at it. I imagine I'll take it to the dealer next if I cant figure it out.

Thanks for any advice!!

 

Sorry brother, I have had no experience with issues like this other than coils. I wish you the best of luck and I'll bump this thread so it can get noticed more.

 

Thanks Zak,

I took it to the dealer and payed my diagnose fee... they're telling me its another coil failure, all were new, but they were global, so we'll see. I have two extra from when I ordered so I'll try swapping them out and see what happens. I cant imagine this will fix it but they said they did stress test, so maybe. I'll post my results for others researching.

 

Definitely let me know what you find out.

 

Swapped out the coil and put in a new plug...So far so good. Its a risk using the global coils (Ive read mix reviews on here), but for $55 for all 8. I'll give it a try. Hopefully It'll stay running strong. If not I'll go with visteon coils (alanisdeals on ebay) next... I (and most others) over at LVC forums have been buying them for years now with very little issues...

Thanks

 

i got my global coils about 4 years ago and they are still going strong.

 

Good to hear. That's next on my list of things to do once I get this oil change.

 

Im not saying they're bad coils..or hell, that I wouldn't order them again (if these last)... just that one of 8 was bad. (and another's bolt hole was not drilled out all the way ). for $55 I'm very pleased...although it did cost me and extra $100 to diagnose the bad one....

it ran perfect all weekend...Im glad she's back (and that the problem wasn't clogged cats!!!)......

 

thanks buddy..I'm pretty sure ebay had a set of 10... I'd get that if I was replacing all 8, just in case.

 

I got the 10 pack, and used one of the back ups. Other than that it was a pretty cost effective solution (so far).