Thanks for the help on the first thread. I replaced the o2 sensor, but i am still getting the same code. I cleared the computer by taking the positive connection off the battery. Could it be my map air sensor or my coolant. the car is a 1991 chevy camaro 305 tpi. Thanks again for the help.

 

Did you pull an error code NUMBER?

 

45 oxygen sensor rich

 

That means you're running rich, not that the sensor is necessarily bad.

 

what could cause me to run rich the map sensor or coolant sensor

 

Lots of things, but if you have a lot of miles on your injectors, that would be where I would look first. Put a pressure gauge on the rail, turn the key on, then off, and see if the pressure holds.