What happens when the EGR valve gets stuck?
What happens when the EGR valve gets stuck? So, when the EGR valve gets stuck open, it isn't able to stop the flow of exhaust gas from entering the intake manifold and thus the combustion chamber and your pickup or SUV will idle rough. Here's a few more specific symptoms you'll see: Rough idle. Code 32: EGR System Problem. Code 33: MAP Sensor Signal High. What does the EGR valve do on a GM 4.3L? More GM 4.3L, 5.0L, 5.7L Tutorials. As you're probably already aware, the EGR valve's job is to let a metered amount of exhaust gas (that...