Running rich - 173 and 177

[Danz13]

Hi All,
I have a 93' ATX.
I am getting codes 173 and 177 intermittently while driving. Usually after the car warms up a bit the CE light comes on and off. I have replaced the MAF a couple times, now I have a reman one, cleaned it and reset the codes between each change. I have also replaced the TPS and still getting the same codes. I have replaced the O2 sensors somewhat recently and made sure they are plugged in all the way. I have had this problem for a while but have not really driven the car much.
I have very recently replaced the plugs as well. I am hoping to get some suggestions before I replace spark wires, fuel filter, and remove and clean the fuel injectors. Thanks!

 

[rubydist]

173 is right bank rich, 177 is left bank rich.

you are likely to have one or more of the following issues:
bad plugs and/or wires
injectors that do not shut off properly
bad fuel pressure regulator
plugged air filter or other intake air restriction

 

[Danz13]

I had the fuel injectors sonically cleaned and flow tested. One was running rich. I also replaced the spark plug wires, fuel filter, and replaced the fuel pressure regulator. Now I dont see the issue any more.

Most likely either the new spark plugs or cleaning of the fuel injector were the source of the problem. Thanks!