Egr Valve
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Race Director
Joined: Jan 2000
Posts: 13,014
Likes: 2,257
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
It should only admit exhaust back to the intake during light load cruise conditions. It shouldn't be doing anything at idle.
The idea is that since you can't reburn the exhaust..it takes up space in the cylinder that would normally be filled with good fuel/air mixture and it cuts cylinder temps dramatically. Usually..if the engine hasn't been tweeked to run without it...the first sign of it not functioning at all is pinging at light throttle and if it is leaking or stuck open it will have a very poor idle.
JIM
The idea is that since you can't reburn the exhaust..it takes up space in the cylinder that would normally be filled with good fuel/air mixture and it cuts cylinder temps dramatically. Usually..if the engine hasn't been tweeked to run without it...the first sign of it not functioning at all is pinging at light throttle and if it is leaking or stuck open it will have a very poor idle.
JIM
Race Director
Joined: Jan 2000
Posts: 13,014
Likes: 2,257
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
You've still got the crossfire right? They usually idle very nice. Look at emission decal for specs.
Check EGR by sticking your finger underneath and pushing upwards on the diaphragm. If it gets worse when you open it...that might be issue.
They also were very prone to vacuum leaks around the gasket where the top plate bolts to intake. Check for leaks.
There is an IAC motor that often gets gummed up or stuck that might not be working.
JIM
Check EGR by sticking your finger underneath and pushing upwards on the diaphragm. If it gets worse when you open it...that might be issue.
They also were very prone to vacuum leaks around the gasket where the top plate bolts to intake. Check for leaks.
There is an IAC motor that often gets gummed up or stuck that might not be working.
JIM
