Yep,
I actually witnessed this act years ago. Thats why I asked if the OP used OEM hose or has any knowledge of these hoses being replaced recently.
I have also known some idiots in the auto parts stores that dont know a radiator hose from a garden hose and will hand you just about anything over the counter...lol.

 

Well, like I said before, the exhaust shop said exhaust and cats were all clear and good and they are the exhaust shop that everyone goes to, for whatever thats worth. So now I'm totally confused on how this could have melted. I have only had truck for 11k miles and it has 161k on it. I know that I have babied it and that it hasn't been in the mud and I haven't potato f'ed the tailpipe either in this short amount of time but who knows about the previous owner(s).

On the other hand, after much reading, I have undertaken the task of changing the plugs myself cause I know they need it anyway. #1 and #5 were both bad. Anyway, I change the plugs on one side and start on #1 or 5 (whichever one is on driver's side, I can't remember) and I get the plug out of the new box and realize it is different than the four I just put in. I know I'm part to blame for not checking but I'm gonna be pissed at them though. The plugs I just put in are Motorcraft sp-485 and the other's are sp-479. Anyone know which ones are incorrect? I have a hunch that it is the ones in the motor that are wrong. I'm going to be asking in the V8 area too.

 

hey man,
hit me up on the email at www.mikiedoo@aol.com for that dpfe sensor your needing.

 

I explained how. Apparently you either didn't read, or comprehend, iduno. Regardless, one may not be plugged now, but could have been obstructed enough in the past to cause your DPFE line to melt.

There's no way in hell an exhaust shop is going to know this unless they ripped into it. They just checked for obstruction. I'll explain a little more. Maybe it will help, maybe not. You have 4 converters, - BOTH forward converters could fall completely apart in time. During so, and at any particular time, pieces of cone can block flow. When this happens, your exhaust heats up until it clears itself. Sometimes the pieces that break are to big to clear, other times, the pieces are small enough clear on their own.

They can only tell you if the exhaust is clear at the time you bring the vehicle in. They can't tell you if all four converters are in one piece. You could loose the two forwards completely and still be within programmed parameters, - meaning you won't get an efficiency DTC. It's impossible reputable or not, -unless they took your exhaust system apart. You haven't a CEL, so why would they look further ....

 

jbrew,
I had understood what you had said to a point and this is a little clearer. What I was saying is I still don't know exactly where the problem is, as in which convertor, or if there is still a problem in there. When I get my new sensor, should I wait to put it on until I find the problem or go with it and hope the blockage doesn't happen again.

 

I wouldn't replace the sensor, - just replace the hose. If you get more DTC's after replacing the hose, post those and go from there. Never-mind, I just looked at your pic again, - you need a new sensor lol.

Yea, since your exhaust is clear now, I would go ahead and replace that sensor and hose. Your exhaust could plug back up in the future, but at this point it's really not worth taking it part. You had it checked, that was the right thing, only thing to do. The pipe the hose connects to is fine as well. - Otherwise you would have flow DTC's, - you don't. Yea, your good IMO.

 

So plugs were successfully changed (thanks in part to this site) but it didn't help one bit. #1 and #5 plugs were pretty bad compared to the others so I figured that was the problem. I took it down the road about a mile and it seemed good as new. Turned around and headed back and it started missing again just as bad. So I'm thinking it could be the COPs on those cylinders. I took the truck to my dads because he has a 99 F150 and I figured I'd swap out the COPs to see if that was it. Most of you experienced people probably know that there is a difference in the 02s and 99s COP plug ins. So that didn't work out. My in-laws have a '00 Expedition so I'm considering checking those COPs out if the plug ins fit. I can handle 30 or 40 bucks for plugs and that not be the prob but I don't want to do $100 for two COPs and that not be the problem.

 

Just switch your cops with a different cylinder, if the misfire follows it's the cop. Also check the pins inside the connector to make sure one didn't get pushed back.

 

ALL COP systems are identical for the ford modulars. There's no difference what so ever.

ALL V8 Coil packs are the same as well. So not sure what you mean about being different.. (?).

 

You can get a whole set of COPs off ebay for around $80. I cannot remember the name but there is one brand that the members of this site seem to really like. Someone will chime in with the name, if not use the search function.

 

brew
it didnt make sense to me either but there is an absolute noticeable difference on the inside of the plug in of the COP. When I say plug in, I am meaning the wires coming out of the COP, not the boot that goes down and connects to the spark plug. Looking at the inside of the plug ins, one has smooth walls going all the way back, while the other, when looking inside, has the walls going about halfway, then it drops down about 2mm then goes the rest of the way back. I know that as clear as mud but its the best way I can explain it. BTW, mine is an '02 Screw 5.4 and dads is '99 Scab 5.4.

 

That's strange, because all 2V 4.6 and 5.4 COP engines call for DG508.

 

Ohhh, I know what your talking about. Yea , Ford (or Motorcraft) used better connectors inside the older coils. Their make up is solid copper and brass and they are a little different. I have a pic of that somewhere. Ford and everybody else cheapened out in the earlier models. Don't worry, their still interchangeable, -it's just a better, heavier style boot and Coil Connector IMO.

Here's a pic, I still use them lol.



Different style, - same resistance.

 

Yea, those were factory on the Green lables -

 

I'm actually talking about the wiring harness itself. Not the boots. Both were labeled dg508 also so that's why it is so confusing. I'm going back after work to take pics. Even the two metal tabs on the inside are different sized.