Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
Yes you need it. If it is gone then it will mess up your engine. If you get a chip you can delete it safely, otherwise, replace the valve.
The EGR is exhaust gas recirculation. And since gas is just carbon monoxide. so carbon does build up in the engine. I used to just put seafoam through the intakes every 40k miles or so.
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner