Thanks, Jbrew. Guess I'm having a hard time picturing how the O-rings are applied. Might become obvious when I actually pull a COP where I can see the hole! R&R'd #4 this evening. Took me all of 15 minutes, and I'm good to go for my camping trip tomorrow. One of the connectors was corroded, and I pulled the boot and spring off, and the blade connector inside was lightly-coated green, as well. I was amazed at the little amount of contact area there! And I'll definitely be applying grease in all areas when I find a stretch of time to tackle the "big job."

Andy

BTW: Ordered COPs from Global Sunday AM, and they came in today's mail.

Also BTW: The wiring tray is on the other (driver's) side and will definitely be a PITA.

 

Sounds good! Glad you found the problem..

Globals shipping is great and fast - Kevin (Owner) keeps an eye on things purdy good - Your the second person that's mention fast shipping (think that's what your saying)

Left a message for him when he sent me the wrong plugs - called me right back the next day , but I already swapped them out at another supplier.

The tray - oh ,the PDB .. I was referring to this on mine -





It's a pain in the **** to work around..

Have a good trip Andy

 

I chased as many vacume lines I could. I even took out the pcv hose and checked the elbo that is way the heck back there. It didn't have any holes.

BUT I DID FIND A HOLE IS A HOSE !! I don't know what it does so I hope the folks on here can help me. There is a pipe coming off the drivers side exhaust manifold up to the egr valve. On the pipe is two smaller pipes. On those pipes are rubber hoses that go to a flat electronic device. Both wires and hoses go to this thing. One of the hoses has a hole in it. It is the bigger of the two small lines off the egr pipe (the back one).

What does this do? Could it cause my miss by changing the egr or mixture or something?

I'm running into town to get plugs, o-rings, and will stop by Ford to get that hose. I figure if the rubber hose is connected to the exhaust it might be special to handle the heat.

Let me know what you think.

Thanks guys.

 

That sounds like the DPFE. Definitely affects the EGR.

 

OK, I'll bite, what is a DPFE? I'm familiar with most sensors in a vehicle. I asked the guy at the Ford parts counter what the hose attaches to. He said "It's a delta.... something. It's a sensor." I figured I wasn't going to get any further with him so I didn't ask any more.

At ford, he told me that the SP479 spark plugs have been superseded a couple of times. The plugs are over nine bucks a piece now. I lied and told him I would do that when I got more money. I went down to AutoZone and picked up the SP479's. What are the superseding plugs? Irridium? Are they better?

 

#4



How she flows -



I'll let glc , expain it - knows more than I bout that . You can go here for the details as well -

http://www.fordscorpio.co.uk/egrmonitor.htm

 

Good link. It all makes sense now. I didn't know there was an orifice in the egr pipe between the two small pipes going to the dpfe. I was having a hard time understanding why two lines were needed.

So... with a hole in the hose from the exhaust side of the orifice would.... hmm... give a lower reference signal. When the pcm wants X amount of gas to go through the egr valve, it will have to flow more than it wants to to compensate for the hole in the reference line. So the way I figure it, I'm getting too much exhaust gas recirculation (when egr is enabled).

Could this cause my plugs to have that white buildup on them?

 

Alright, I've read through this and the only part that applies to my problem is the symptoms.
5.4 3V With 12,500 on the odometer.
Mine seems to have a slight "rough idle" or miss occasionally if I sit for a while at a light or just idleing in a lot..
No warning lights come on I just feel it.

Could this be my coils already?

 

Sure it could. I would pay the dealer to stress test the coils and identify the faulty one and just replace it. Ask the tech to please relocate the faulty one to #1 and get one off e-bay. Or you could pay them the $100 to replace the weak one. Diagnostics at the dealer cost's about $65

 

I just installed COP'S in my truck and changed spark plugs cleaned mass air sensor,the problem is from 40mph it misses bad right after it shifts into overdrive.
It runs strong at idle,takeoff and at high speeds.
Looking for more suggestions.Thanks
P.S.....
Global shipped out the COP'S and I had them in two days,thanks jbrew

 

That jbrew is a wealth of great technical reference
i don't know how he accesses it so fast
he should be working for ford

I would try taking the vacumm line off the egr and plug it to see if it improves performance. When the system has leaks it will open the valve at wrong times

if that fixes your miss the problem will be with the egr. if it don't it will probably be with the coils and plugs.

i don't remember in your thread did you ever change the fuel filter.
one of the most important things to isolate a problem[ for ametures like us>
only try one thing at a time. don't make alot of changes at once. that way if the problem worsenses you will know what to undo

 

That would be sweet working for for Ford - I could get overpaid with awesome bene's and still complain about it ... I've worked for the big three - but sub-contracted only. Construction work on there test tracks - finished up Fords big in line parabolic track in Dearborn 2005 - now they don't have to farm out there testing and do it all in Dearborn . That was a 2 year project and the nicest track I have had the opportunity to work on. That track was projected to save them over 9 million in a short amount of time.

Thanks for the complement ( :

 

Tumba,
The fuel filter was replaced this summer. But it had never been changed before then and the truck surely had over 80,000 miles on it then (truck has 97000 on it now).

I thought about plugging the line to the EGR and trying it. But if the EGR is commanded on when it misses, is the problem too much EGR gas being recirculated or is it a weak spark that can't fire the lean mixture?

The EGR valve itself is "stupid" only moves when vacume is applied. It appears the DPFE would be at fault if I'm getting too much exhaust recirculated.

Comments? Experiments? Am I all wrong here? Just trying to learn and fix this thing.

 

An EGR valve can be crapped up to the point where it's stuck part way open..........

 

so true.

jeister if it is half way, disconnecting it wouldn't make any difference. but if you have vacuum problems. it would not open if disconnected from it power source. might help isolate the problem.
it sound like you have multipal problems. and from what these guys have been saying about new coils that might still be your problem.
don't look for the one thing that fixes all.
when one thing goes wrong the pcm may compensate enough so you don't notice. after some time something else goes wrong and then it can't compensate enough and then you have multipal prblems.

list again all you chenged and fixed just so they will see it all at the same time