EGR Valve wont come off

[austinnelson117]

Hey guys, well my dpfe sensor and hoses are melting and i am suspecting the egr valve but the problem is i cant get the egr nut off. any suggestions?

 

[Sams01XplrSprt]

welcome

 

[fixxxer]

Hi and welcome. PB Blaster penetrating oil seems to be the preferred item to use, you may want to soak it pretty good, let it sit for a cpl of hours then hit it again before attempting to remove that nut. Some people would recommend spraying it then letting it sit overnight before attempting to remove the nut as those EGR assemblies get a lot of corrosion and can be a real PITA to remove. PB Blaster is available at most auto parts houses.

 

[96eb96]

Hey guys, well my dpfe sensor and hoses are melting and i am suspecting the egr valve but the problem is i cant get the egr nut off. any suggestions?

First of all, I cant see how anything with the EGR valve itself will cause the dpfe hoses and sensor to melt.

Are your hoses tight on the valve and sensor? Do they have any exhaust coming out?

The EGR nut can be a real pita, you may want to get a flexible MAPP gas torch to heat it up very carefully (watch for gaslines). PB as Fixxer said is great too, so is Kroil. Often the tube is destroyed in the process.

 

[robertoa1a]

I know that 96eb96 is a bit of an emmisions genious! We should be glad that folks like him are willing to share thier skills. People in the shop don't share information!

Shop charges are through the roof. thats no bull!

Answer, listen, and, learn.

 

[robertoa1a]

I'll share a bit of info on that. On the passenger side; as you look at the egr valve, theres a metal tube comming into the the bottom of the egr valve, right?! If that is the nut/fitting that you are trying to get loose, then it looks easy 'til you try to get it with your dads old set of tools. You can get some plummers open wrenches that have 45 deg box on one end and regular on the other(I think its a 1-1/16). You can get a cresent wrench on the egr body and spend about 10 min working the nut loose. PB blaster helps a lot but won't do the job for you.

Ok, use some penetrating oil when the engine is still warm first.

We aren't mind readers here. You have to explain the problen specificly if you want a tech to throw a you a specific answer.

 

[96eb96]

I know that 96eb96 is a bit of an emmisions genious! We should be glad that folks like him are willing to share thier skills. People in the shop don't share information!

Shop charges are through the roof. thats no bull!

Answer, listen, and, learn.

Aww, I just try to help and share experience. But the EGR valve itself, unless there is a massive hole spewing exhaust wont cause hoses and sensors to melt. The EGR simply opens and closes allowing exhaust gas to flow thru the tube. The tube contains a small restriction, and the rubber hoses sense the pressure differential over that restriction. If the egr valve is closed pressure A=B so the sensor sees no flow. As the valve opens, there is a differential pressure across the two different sized hoses on the opposite sides of the orifice, and the sensor detects pressure change.

Exhaust gas NEVER travels up to the sensor. What you have is dead air space (like when you close off a vent in a room in your house). Air at the sensor is ambient temperature. Static air is a great insulator!

Here is the problem though- There are cases of the hoses slipping off the plastic sensor. Now you have a hot exhaust conduit, creating a blowtorch effect that destroys the sensor and hoses. To fix this issue, I suggest two tight wireties on the dpfe sensor hose nipple. Then you clip the excess off. Looks like they are part of the assembly when you use black. Even if you don't have a problem now, you should do this, otherwise you are looking at a $50 minimum(up to $130 if you walk in cold at a local stealer) for a new part. And probably over $200 if your friendly shop does it.

I am assuming this is his problem.

As for removing the EGR bolt, even with the correct sized wrenches I found heating and expanding the tube nut necessary. As it cools you can spray some oil. Not saying you can't do it, but there is a good chance you will be making ford $60 richer when you need a new tube.

 

[contrail]

I had a problem where the tube slipped off the dpfe sensor. I was driving one day and herd what i thought was an exhaust leak. got home opened the hood and it looked like a small explosive went off in the hose barb part of the dpfe. shreds of melted and now cooled plastic all around the area and a half eaten sensor.
popped that puppy off and just got a new one. used stainless steel hose clamps and never had another problem.

ALSO I learned they get very brittle over time! I broke my friend's by accident with the slightest movement of the hose

that sucker costs $45

 

[austinnelson117]

alright thanks guys, i went ahead and replaced the sensor and hose and used hose clamps to avoid this in the future. CEL finally off and ready for inspection!!!

 

[contrail]