I was out fiddling around with my rear shocks after I changed the air filter and filled the radiator back up with antifreeze and chnged the hose when I thought to myself, :Let me seee if the coolant will leak out". I started the car for 15mins and waisted to see if there where any leaks and there wasnt. I fixed the hose, and i was happy. The mistake is that I said i wasnt going to check that until tomorrow when I get my new 02 sensor put in. I took the old one off and started the car without it. Made a nice load rumbly noise though.

what did you start the car without? i am so confused!

I doubt u really hurt anything, what probly happened and someone else needs to chime in here because im not sure about it is the computer probly read ur exhaust as extremely rich or extremely lean.

I, too, can't confirm you didn't hurt anything, but if all you did was run the car without the O2 sensor, I would be willing to bet real money all you did was throw a code and maybe burn a little extra gas...

it doesnt sound like the car was on long enough to actually start taking readings from the o2 sensor, so i doubt he actually threw a code. do u know what temp the engine was at when u turned it off?

I just asked my friend ( who is a mechanic) and he said you will not cause any damage by starting it with the O2 taken out and unplugged.

"sigh" "whipes forhead of relief"

I waited for it to go to 200*

I would loook at that problem this way. GM engineers should have coded in a setting in the computer for when there is no O2 sensor because if you were driving and hit something which cut the 02 wires, then they should have it planned out so no damage would be done.