EGR Mystery

[KILNA]

It looks like a few of the folks in your previous thread were slightly confusing, muddling the two problems of blocking/clogging/keeping closed the EGR valve and the opposite issue of the EGR being clear and stuck open. The 2nd post was correct, however he seems to have missed that yours failed open, not closed... most EGR failures are the valve being closed or a blocked EGR tube. Generally, when folks are talking about "disabling", "deleting" or "removing" the EGR valve, they're talking about blocking it off. This is the same as the valve being in the always closed position, or the tube being clogged. What you have, according to the CEL code, is a valve which is always open. This would effect performance, it's always venting more exhaust than desired back into the engine (making it cooler than the engine is tuned for and throwing off the fuel/air mix).

[mattferguson14]

It looks like a few of the folks in your previous thread were slightly confusing, muddling the two problems of blocking/clogging/keeping closed the EGR valve and the opposite issue of the EGR being clear and stuck open. The 2nd post was correct, however. Generally, when folks are talking about "disabling", "deleting" or "removing" the EGR valve, they're talking about blocking it off. This is the same as the valve being in the always closed position. What you have, according to the CEL code, is a valve which is always open. This would effect performance, it's always venting more exhaust than desired back into the engine.

Do you think it may be beneficial then to disconnect my EGR until I get a new one? that way it should stay closed right? When I had the EGR off the truck, the valve seemed to open and close fine. I cleaned a bit of carbon out of it. But I'm assuming that it gets stuck open when the engine is running because it has an internal electrical problem. If I disconnect, in theory it should stay closed, which would not necessarily effect my engine performance??

[KILNA]

Do you think it may be beneficial then to disconnect my EGR until I get a new one? that way it should stay closed right? When I had the EGR off the truck, the valve seemed to open and close fine. I cleaned a bit of carbon out of it. But I'm assuming that it gets stuck open when the engine is running because it has an internal electrical problem. If I disconnect, in theory it should stay closed, which would not necessarily effect my engine performance??

I *think* the default position is closed, so if that is the case, I'd expect that any rough engine behavior would go away. It'd be more similar to what it's like when you don't have your code being thrown. Obviously, it'll throw other codes now instead. Generally speaking, the ill effects of the closed position are less than the open position though, I'd probably do what you're planning until I got the replacement.