GregWard

My 95 5.8 Eddie Bauer is running codes for o2 sensor running rich and also running the code for o2 running rich. Where should I start?

wde3477

Welcome to the site!

What were the specific code numbers?
When were the O2 sensors last replaced, if ever?
Has there been any Seafoam, Berrymans, or other type of injector cleaner used recently?
When was the last engine tune-up - plugs, wires, etc. - done?
Any other codes being thrown?

GregWard

Thank you! The specific code # were 172, 173. I ran a can of seafoam through it 1500 miles ago then did a tune up. The wierd thing about it is that when i'm halfway to work it'll kick the check engine light on. It doesn't stay on all the time which makes me wonder. I'm sure the o2 sensor is probably due to be replaced but i'm not sure how long ago it was replaced

jrh5610

You might want to check out the EGR valve and vacum supply going to it. If its not working properly that will also cause the O2 sensor to go nuts because its not recirculating the spent exhaust gases

gelpidamian

Mine is acting real weird when I crank it it idles up and down whith the emission light on sometimes it Boggs way down and when I give it gas it will act like it has to tail but other times will go until it gets to a certain rpm then will slug anything after that I need help bad Ny ideas?

maniacmikey

Might want to check the fuel pressure. When the regulator goes bad it will cause it to run rich.

gelpidamian

Im with him check the ehr ive owned many a ford and the egr has done some really weird things and a simple bypass fixes all

Warlockk

First make sure to clear codes then run the engine till you see the problem again, then recheck. Also pay attention to all circumstances at the time. Temp, time , smell, sound etc. The egr is a good possibility as is the o2. The o2 warms up to begin working. It could give one error cold and one warm. Also look for vacuum leaks.