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Elbow fitting to EGR valve by TXGOOD
Started on: 10-14-2013 08:59 AM
Replies: 12 (332 views)
Last post by: TXGOOD on 10-22-2013 10:27 AM
TXGOOD
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Report this Post10-14-2013 08:59 AM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is the elbow fitting that runs from a vacuum line to the EGR valve suppose to be rubber?
On mine the end is totally melted and it won`t stay connected to the EGR.
Might that be an indication that the EGR valve may be leaking causing exhaust to be heating up the top of the EGR more than normal?
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fierofool
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Report this Post10-14-2013 09:22 AM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
It should be rubber. Replacements can be found on the HELP rack at the parts stores. You can test the EGR valve for leaks by removing the elbow and pressing upward on the diaphragm from underneath. Cap the nipple then relax the pressure against the diaphragm to see if it holds vacuum. If you feel it returning to the resting position, it's defective. 5 inches of vacuum with a hand pump will also diagnose it.
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TXGOOD
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Report this Post10-14-2013 09:36 AM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks, I will try that.
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TXGOOD
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Report this Post10-14-2013 10:13 PM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierofool:

It should be rubber. Replacements can be found on the HELP rack at the parts stores. You can test the EGR valve for leaks by removing the elbow and pressing upward on the diaphragm from underneath. Cap the nipple then relax the pressure against the diaphragm to see if it holds vacuum. If you feel it returning to the resting position, it's defective. 5 inches of vacuum with a hand pump will also diagnose it.


Thanks, I found a new elbow.
Pushed up on the diaphram, held my finger over the hole and it stayed in place until I let go.
Installed the elbow and it looks like it`s good to go.
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fierofool
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Report this Post10-15-2013 01:19 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
It may have melted due to being loose and falling down onto the exhaust or EGR tube flange.
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TXGOOD
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Report this Post10-20-2013 05:03 PM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
Well, the saga continues.
I drove my car in North and East Texas this weekend at highway speeds and this morning when I was getting ready to head home this is what I found.
The new elbow I installed before I left Friday was melted again.
Somehow where the elbow attaches is getting hot enough to melt it.

[This message has been edited by TXGOOD (edited 10-20-2013).]

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fierofool
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Report this Post10-20-2013 08:38 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Definitely needs to be replaced.
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Report this Post10-21-2013 06:59 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
You probably have an exhaust gas leak at one of the flanges that's being directed towards the line. The diaphragm housing shouldn't get that hot on it's own.
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TXGOOD
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Report this Post10-21-2013 09:03 PM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks guys, I think I will just replace the EGR valve and gaskets.
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fierofool
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Report this Post10-21-2013 09:50 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'm just trying to figure out how hot exhaust gases can get up through the valve but it still holds a vacuum. I don't see anything in your picture to indicate hot exhaust gases blowing on it from any thing close. If it was, it looks like it would also burn the shrink tubing, too.
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TXGOOD
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Report this Post10-21-2013 11:04 PM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
The only other thing I can figure is considering the EGR mostly works at low RPM maybe the vacuum solenoid is bad causing the EGR to always get vacuum causing it to stay open during higher RPMs such as at highway speed.
That would probably allow the EGR body body to get much hotter than normal.
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Report this Post10-22-2013 10:02 AM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Air doesn't pass through the valve to the solenoid, it just moves back and forth as vacuum is applied. The pintle is hollow on many of the EGR valves, so that might be the problem, but I still don't understand how heat can pass through the pintle and yet the valve still holds a vacuum. .
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TXGOOD
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Report this Post10-22-2013 10:27 AM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierofool:

Air doesn't pass through the valve to the solenoid, it just moves back and forth as vacuum is applied. The pintle is hollow on many of the EGR valves, so that might be the problem, but I still don't understand how heat can pass through the pintle and yet the valve still holds a vacuum. .


I know that air doesn`t pass through the valve to the solenoid but if the solenoid is defective and it`s allowing vacuum to be constantly applied to the EGR valve, thus it remains open then the hot gases passing from the exhaust manifold to the tube at high speeds might cause the EGR valve body to heat up.

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