i just bought a 93 trans am two days ago. the car runs great but i lifted it up to look under it for an oil leak and noticed that the passenger o2 is not plugged it. the driver side is pluged it but it looks like some one replaced the o2s at one time with the 4 wire o2 sensors. Correct me if im wrong but dont the 93 trans am have one wire o2. the pass. side still has the one wire connection on the wiring harness so it will not plug into the o2 sensor.

 

You can convert your 93 to the 4-wire heated O2 sensors - that's one option. From Shoebox:

http://shbox.com/1/heatedsensor2.jpg

Or buy the correct 1-wire sensors. Shoebox has the part # on this page (near the bottom, on the left side):

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

 

would it be ok to have one heated o2 and one single wire o2?

 

Define "OK".

How do you know the 4-wire sensor is even hooked up correctly?

Do it right, or don't do it at all. The A/F ratio is "tuned" by the O2 sensors in closed loop. Since the car has headers, the O2 sensors may be too cold to work correctly, causing the ECM to run in open loop. That will generally give you poorer results with regard to fuel mileage, and the ability to adjust for changes in the engine components (e.g. - injectors) as they age or crud up.

 

would it be best with the four wire o2s? i will check the wiring on it tuesday when im off of work. its not the same car in my sig. but its set up about the same way. and it does have long tube headers. its a 93 trans am

 

Long tube headers on a 93 will work better with the 4-wire sensors.