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I may have fixed p0401. I asked one of my ex gf's (heavy equip. mechanic) why it would do this. She said to take a coathanger and poke around the hole on the plenum side of where the egr valve mounts. Said if it goes all the way, there is another problem, but if it doesn't go through all the way, its likely a carbon buildup, and just need to clean it and clear the code. I tried this, and you would not believe (or maybe you would) how much carbon was blocking it.
I cleaned it out, and I cleared the code. Hasn't come on yet, and I'm hoping it stays off.
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1999 Alero GLS, 3400, 4T45E, current mods: WAI with Spectre HPR cone filter, VVME 55w 8000k HID kit
275,000 miles as of 05-14-2015 at 1559 est (3:59 pm)
Planned mods: F body front brake upgrade, ported UIM, LX9 top swap, ported exhaust mans, performance cam. Eventually, turbo or supercharger.
1999 Olds Bravada, 4300 Vortec v6, 4L60E. Current mods (on it when I bought it):
75mm ported throttle body, NGK stage 1 plugs, stage 1 heads.
Planned mods: injector upgrade, exhaust headers
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