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Author
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Topic: EGR disconnect
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cobravenom71
Gearhead Posts: 779
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 11-29-2002 02:27 PM
   
If I was to disconnect and plug the vacuum hose from the EGR-valve on my 73 conv.(302-2V), is there any advantage to that? Will this improve the idle, mileage or performance? Or, will it run worse? It runs OK now(100% stock everything), but it has a noticeable stumble on acceleration and a slightly rough idle. The accelerator pump appears to be working fine.------------------
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cobravenom71
Gearhead Posts: 779
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 11-30-2002 09:27 AM
Egr------------------
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RonnieT
Gearhead Posts: 637
From: Port Allen, La. 70767
Registered: Jun 99
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posted 12-01-2002 11:59 PM
cobravenom71 You can remove the vacuum line from the EGR (exhaust gas recirculation) valve with out any ill effects. There is realy no advatage to this if the vacuum hoses are connected properly. The valve could be leaking through and causing the problems you stated, but plugging the vacuum hose wont do anything for that. You can replace the valve, or pull the valve and make a block off plate to block the ports off. I used to cut a solid gasket for them and put the valve and hose back on, you could not even tell it was disconnected. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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cobravenom71
Gearhead Posts: 779
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 12-02-2002 08:05 AM
How do you determine if the valve is leaking into the intake when it is supposed to be closed?------------------
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RonnieT
Gearhead Posts: 637
From: Port Allen, La. 70767
Registered: Jun 99
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posted 12-02-2002 10:47 PM
I have never found a good check to see if the valve is leaking through. There is a opening on the underside of the diaphragm that you can push up on the diaphragm slightly to open the valve just a little. If there is a noticable change in idle the valve is probably seating off, if the idle does not change the valve is leaking through. I guess you could crank the engine and let it idle, then see if the valve gets hot at the base quickly, this would be a sign of it leaking through also. I always just blocked them off if I suspected they were bad.------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23 [This message has been edited by RonnieT (edited 12-02-2002).]
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cobravenom71
Gearhead Posts: 779
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 12-03-2002 10:12 AM
RonnieT, First of all, thanks for your advice.
The EGR valve on this 73 Mustang for some reason does not have any openings of the diaphragm-case that can be used ot push on the diaphragm as you described.
I have used this test on both of my Lincolns, and both of those valves DO have openings on the case.
I don't know if the 73 style valves are different, or if this is maybe an aftermarket replacement, but either way, it is sealed up.
What exactly is the procedure for blocking off the valve as you described earlier?
Thanks so much, Kit.------------------
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RonnieT
Gearhead Posts: 637
From: Port Allen, La. 70767
Registered: Jun 99
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posted 12-03-2002 10:44 PM
What I have done in the past to block the ports off is to use a piece of asbestos gasket material, which is very hard to find nowdays. I am sure you can do it by using a thin piece(.016" or so) of metal and RTV that is gas resistant. Pull the EGR valve and use it, or the old gasket as a template to cut the plate out. When you cut the holes in the plate only cut the bolt holes out, and if the valve has a protruding portion cut the hole out so it will fit over it. Do not cut the other hole in the plate, this will block the passage off. Then install the EGR valve with the plate in place of the gasket with a little RTV on both sides. The other option is to cut a 1/4" thick piece of plate and drill only the holes for the bolts, put a little RTV on it and bolt it down, just like a fuel pump block off plate. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23 [This message has been edited by RonnieT (edited 12-03-2002).]
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 12-04-2002 08:18 AM
When I can't actuate an EGR by hand to test it, I use my Mity-Vac. I usually have it out to check the diaphram, anyway.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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cobravenom71
Gearhead Posts: 779
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 12-04-2002 09:25 AM
I have no problem checking the diaphragm operation of the valve. I need to know how to check to see if the valve is leaking exhaust gas into the intake when it is supposed to be closed(no vaccum applied). I am familiar with the 'vacum to the diaphragm to see if the engine stalls at idle test'. My concern is that it is not sealing off the exhaust when it is supposed to. The engine has an annoying stumble on acceleration. The accelerator pump is working fine. ------------------
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