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Registered
Join Date: May 2005
Location: ny
Posts: 11
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**egr valve 1979 u.s 928!!!!help!!!
Hello all. could someone tell me the symptoms of a failing EGR valve?? I suspect mine has failed and causing a huge vacuum leak! Also can someone tell me also how to temporarily block or plug it.. thanks!!!pics would be good if someone has them showing exactly what to plug etc.
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04-24-2013, 04:30 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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EGR Exhaust Gas Recirculation, mixes some hot burnt exhaust with intake air to control emissions, nox I think, by reducing lean burn temperatures.
Pinch the vacuum line going to it if its soft, or pull off the end and stick in some kind of plug. MityVac or its ilk work dandy for finding vacuum leaks, but replacing all the lines isn't bad. |
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04-24-2013, 09:11 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Link to pict
Porsche 928 Exhaust Gas Recirculation Parts |
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04-24-2013, 09:12 PM
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Moderator
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I bet the Diverter Valve diaphragm is torn. Should be a one way valve between the cat and the diverter. Just plug it as Mike stated.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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04-25-2013, 03:36 AM
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Registered User
Join Date: Mar 2013
Location: NEW YORK
Posts: 23
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Thanks guys!!!
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04-25-2013, 04:21 AM
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Registered User
Join Date: Mar 2013
Location: NEW YORK
Posts: 23
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Anyone happen to have a pic if the valve itself? I checked the diagram danglerb supplied but still a little unsure of where I should be clamping off.
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04-25-2013, 04:26 AM
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Registered
Join Date: Feb 2008
Location: El Cajon CA
Posts: 480
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The EGR valve has 2 vacuum hoses going to it, #26 and #30 on the link Danglerb provided. When the vacuum signal in #30 is greater than #26, the EGR valve opens. If you have those 2 hoses backwards, your car will feel like it has a huge vacuum leak. I would verify all vacuum lines are properly hooked up first. What makes you think it's a bad EGR valve?
Check the decel valve, #21 below. You can test by removing the valve and replacing #22 and #24 with some large vacuum caps. 
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Raymond 1979 928 5 spd |
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04-25-2013, 08:56 AM
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Network Native
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Location: SoCal
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Quote:
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US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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04-25-2013, 04:48 PM
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Registered
Join Date: May 2005
Location: ny
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Quote:
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04-26-2013, 09:11 AM
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ok I have a similar deal on mine, except there is no PIPELINE (#20 in the Auto Atlanta diagram) on my car. Where does that line go? The orange hose is just capped off with a screw in the end of it, too.
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Porsche. There is no substitute. 1979 928 US. Black and Tan, 5 Speed. |
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07-21-2015, 10:24 AM
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Registered
Join Date: Feb 2008
Location: El Cajon CA
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#20 lower end of it attaches to the right exhaust manifold.
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Raymond 1979 928 5 spd |
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07-22-2015, 09:12 AM
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