Join Date: Apr 2008
Location: shreveport, la.
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My 03 will only do it on the stock tune, pretty sure it didn't matter if the valve was plugged in or not, but with the tunes the egr is turned off so it dosnt do it. So I guess if you have the 03-04 that won't throw a cel, turn the egr back on in the tune even if its deleted.
My canned sct tunes give me the option to turn egr on or off, so maybe I'll try turning it on even though its all removed from the truck and see what happens.
One thing I did notice while testing my truck when the hpop went out, my Mac tools scanner wouldn't finish the koer self test without the egr plugged in.