Ok on my 90 lude, I can't find the place/plug to jump for the codes. (it is not under the peice of carpet below the stereo?)
I found the led that blinks on the ECU BUT there is 2 blinking lights one on the left, one on the right, the left one blinks 10 times pretty fast the right one blinks 6 times not so fast they both repeat over and over. What one is the true "code" for a check engine light? And how do I find the place to jump to make the cel blink?

Thanks guy's I know this has been hashed out a million times.... I searched but could'nt find the specific answer I needed. (for my year of car)