I broke the rear end back in october and had to wait a while till i had enough bread to fix it. when i had it fixed, the car came back with more problems than it had before. car wasn't running right, and it feels like i've lost A LOT of torque. the smell of gas is enough to get you high, and when i get to a stop, i get the SES light and the car shakes a lil like if it's missing or something. the car does leak a little bit of oil by the timing cover... don't know if that may have messed up my opti somehow... anyways, what do I need to do now, i'm not too familiar with the LT1's ignition setup, but i'm a quick learner and i'm broker than broke so i'm not going to let anyone touch this if i can fix it myself. 43 and 44 has something to do with the ignition and o2 sensor right? i also got a code 70 but i think that has to do with the AC. thanks for the help guys!

 

Use Shoebox's code list, specifically for the LT1:

http://shbox.com/1/Dtcs.htm

DTC 43 = Knock Sensor (KS) circuit

DTC 44 = Bank 1 (left) Heated Oxygen Sensor (HO2S) Circuit (lean exhaust indicated)

DTC 70 = A/C clutch relay driver circuit

Knock sensor is easy to check. Pull single harness wire off sensor, KOEO check the wire for +5V to engine block ground. Harness still unplugged, measure the resistance from the single pin on the knock sensor to block ground. Should be between 3,500 - 5,500 ohms. Reconnect harness to sensor. Check voltage from harness wire to block..... should be in the range of 1.5 - 3.5V.

 

if the knock sensor had gone bad would that make the car feel like it has no power? sometimes when im driving the car i feel it loses power, and when i get on it, it gets worse and worse, sometimes ill have the car WOT and it'll barely be moving - until the SES light comes on and then she starts to function again, but not 100%.

 

When the knock sensor fails, the PCM applies almost continuous knock retard, up to 12*, based on the data from other engine sensors. Would feel weak, but wouldn't provide the extreme loss of power you are describing.