EGR test
Le Mans Master
Joined: Jun 2019
Posts: 7,640
Likes: 2,460
From: Indiana
take it off.. see if you can see heavy build up and or blow through it.
personally block it off..79 had 4 different ones!! not all tests make sense on vacuum bypass ones..
slide 14 and 25
https://www.corvetteforum.com/forums...x-power-2.html
personally block it off..79 had 4 different ones!! not all tests make sense on vacuum bypass ones..
slide 14 and 25
https://www.corvetteforum.com/forums...x-power-2.html
Instructor
Joined: Jul 2020
Posts: 219
Likes: 101
From: North Carolina
I took mine off and tested it with a hand vacuum pump. The pump has a gauge and if it’s good it holds pressure. I think amazon has this tool.
Many people just disconnect this valve but I cleaned my valve with carb cleaner. I have all the pollution control items in original condition as is the car.
Many people just disconnect this valve but I cleaned my valve with carb cleaner. I have all the pollution control items in original condition as is the car.
Last edited by Proactive_Solutions; Aug 7, 2020 at 09:29 PM.
Le Mans Master
Joined: Jun 2019
Posts: 7,640
Likes: 2,460
From: Indiana
I took mine off and tested it with a hand vacuum pump. The pump has a gauge and if it’s good it holds pressure. I think amazon has this tool.
Many people just disconnect this valve but I cleaned my valve with carb cleaner. I have all the pollution control items in original condition as is the car.
Many people just disconnect this valve but I cleaned my valve with carb cleaner. I have all the pollution control items in original condition as is the car.
remove it
Last edited by interpon; Aug 9, 2020 at 03:40 PM.
Melting Slicks
Joined: May 2015
Posts: 2,365
Likes: 428
From: Cape Girardeau Missouri
Remove the EGR valve and operate it manually. It should move freely. If not, replace. If it seems OK then clean both the pintle and the seat as deposits will cause a leak and bad idle. The valve should be fully closed at idle and deceleration.
Race Director
Joined: Mar 2017
Posts: 11,880
Likes: 4,468
From: Virginia
Move the vacuum advance on the distributor from a ported vacuum source to a manifold vacuum source on the carburetor. My 80 would barely idle when I accidentally swapped the port.
If you take the EGR off to test it, block it off with a plate.
If you take the EGR off to test it, block it off with a plate.
Last edited by Bikespace; Aug 10, 2020 at 03:12 AM.
Instructor
Joined: Jul 2020
Posts: 219
Likes: 101
From: North Carolina
I agree with Bikespace, if you are removing the EGR the idle will lower if you live the distributor advance to the manifold port. I have also found this to be true.
Last edited by Proactive_Solutions; Aug 10, 2020 at 07:32 AM.
Le Mans Master
Joined: Jun 2019
Posts: 7,640
Likes: 2,460
From: Indiana
manual auto also makes difference.. and what was on the shelf for EGR valves and designs..at build time..
i think other than not sealing with crap.. they are pretty bullet proof
Last edited by interpon; Aug 10, 2020 at 08:47 AM.
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