Not to resurrect an old thread, but I've now replaced the EGR valve and gasket, and the light STILL came back on, so this means I'm going to have to take things apart and get in there to bust that shit out. My concern now is hurting the engine or something else by leaving the bottom piece of the manifold on while I clean it, because a lot of the crap that comes loose (not to mention carb cleaner) will go down the intake, and get sucked in. Won't that mixture of carbon bullshit and carb cleaner mess up the intakes?