Ran EEC self-tests, got codes, now what?

[SHODOG220]

Ok so I ran the KOEO and KOER test on my 92 and the codes I got for the KOEO were 173 and 177. The 173 means "HEGO indicates system rich (RH)" and the 177 means "HEGO sensor indicates system rich (LH)" so does this mean I need new oxygen sensors or is something else causing my car to run rich?

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92 black/black MTX, 48k miles, SHO SHOP Y-pipe, silencer box removed.
91 White/Black MTX: Dynomax catback/Summit Turbos, K&N Filter, Boxless, Kuhmo ECSTA 225/55VR16 tires, Centerforce Dual Friction Clutch/Grizzly TOB, SHO NUT Motor mounts. SHOCAGO Member

http://www.picturetrail.com/shodogg

 

[JonVH]

If you have hard starting and over 100K on the sensors it would seem to point in that direction. But before you go & buy something you don't need go to SHOtimes.com & look under "how to detect a bad O2 sensor"
if they fail then that most likely is it. If they pass then you have another problem.
Good luck!

Originally posted by SHODOG220:
Ok so I ran the KOEO and KOER test on my 92 and the codes I got for the KOEO were 173 and 177. The 173 means "HEGO indicates system rich (RH)" and the 177 means "HEGO sensor indicates system rich (LH)" so does this mean I need new oxygen sensors or is something else causing my car to run rich?

 

[SHODOG220]

I do have sort of hard-starting but nowheres NEAR 100k. See sig

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92 black/black MTX, 48k miles, SHO SHOP Y-pipe, silencer box removed.
91 White/Black MTX: Dynomax catback/Summit Turbos, K&N Filter, Boxless, Kuhmo ECSTA 225/55VR16 tires, Centerforce Dual Friction Clutch/Grizzly TOB, SHO NUT Motor mounts. SHOCAGO Member

http://www.picturetrail.com/shodogg

 

[Shoman594]

Luke what is your cars problem? is it hard starting ?

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Ryan

SHOcago Enthusiasts Club President
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'94 Opal Frost MTX "Shoman 4"
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To Join SHOCAGO Enthusiast Club, Please Email me
E-Mail mailto:[email protected][email protected]</A>

 

[SHODOG220]

Ryan, look here: http://www.shoforum.com/ubb/Forum17/HTML/000712.html

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92 black/black MTX, 48k miles, SHO SHOP Y-pipe, silencer box removed.
91 White/Black MTX: Dynomax catback/Summit Turbos, K&N Filter, Boxless, Kuhmo ECSTA 225/55VR16 tires, Centerforce Dual Friction Clutch/Grizzly TOB, SHO NUT Motor mounts. SHOCAGO Member

http://www.picturetrail.com/shodogg

 

[89 SHO/SC]

bad plugs ? bad plug wires?? If a cylinder isn't firing (under-load), it shows up as a rich condition

 

[SHODOG220]

Thats the thing, I let the engine do that SEFI or "Cylinder Balance Test" where its supposed to "cut the injector to each cylinder, looking for an expected drop in RPM." It did that and came up with a code 9 which means all is fine.

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92 black/black MTX, 48k miles, SHO SHOP Y-pipe, silencer box removed.
91 White/Black MTX: Dynomax catback/Summit Turbos, K&N Filter, Boxless, Kuhmo ECSTA 225/55VR16 tires, Centerforce Dual Friction Clutch/Grizzly TOB, SHO NUT Motor mounts. SHOCAGO Member

http://www.picturetrail.com/shodogg

 

[sdpatt]

It is rare for both O2 sensors to fail simultaneously. Your system may actually be rich. You may want to try cleaning your MAF filaments with a gentle spray of intake cleaner.


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Scott

1991, 254K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
6 disc CD, Class II hitch, Silver award at SHOklahoma Car Show