GreatV8

What are the signs of fading o2 sensors? Mine have about 100k on them...no real sign of any problems just curious. Is there a general rule of thumb on how long the factory Delco ones last?

ss.slp.ls1

iTrader: (36)

You could hook up a scanner and see if the o2's are oscillating within the full spec range. But at 100k, if you've got the cash, I'd recommend that you get some new AC Delco o2 sensors.

transamws6_97

iTrader: (5)

i just picked up 2 ac delco o2 sensors for 90 shipped so its not too bad if you want the insurance

djjab57

iTrader: (17)

where di you get them from?

nik1703

2 for 90 isn't that bad of a deal

James Montigny

iTrader: (13)

The 4-wire flat Boshes usually run about $42 at the local parts store.

ss.slp.ls1

iTrader: (36)

I have heard good things and bad things about the Bosch units. AC Delco's are more expensive, but I have never heard of any bad experiences with them.

Elliott's94Z

iTrader: (12)

So I've done some search on a few different web sites and the link you sent me for those O2 sensors are coming back as "CATCO" o2 on Summits web site and I think they are for a third Gen...any difference between the 3rd gen and 4th? On GM parts direct they are a different o2 then the actual part number Summit gave me for the OEM replacement AC Delco's. I'm not sure these are the correct ones. ThirdGen.org they say they are a 3 prong...aren't ours a 4 prong?

ss.slp.ls1

iTrader: (36)

Yeah, they are different, ours are 4-prong.

Elliott's94Z

iTrader: (12)

Yeah the ones he bought are for a 96-97 5.7lL from what Summits web site is saying...doesn't look like they work for the 93-95

ss.slp.ls1

iTrader: (36)

The '94-'95 o2 sensors are the same as the '96-'97 front o2 sensors.

'94-'97 fronts...
1994-1995 heated oxygen sensor
1996-1997 front heated oxygen sensor
AC-Delco # AFS75
19178930
(old 25312184)

For you '96-'97 guys...
1996-1997 rear heated oxygen sensor
AC-Delco # AFS97 19178921
(old 25312196)

For you '93 guys...
1993 Oxygen sensor (non-heated)
AC-Delco # AFS21 19211437
(old 25166816)

transamws6_97

iTrader: (5)

shouldnt be catco o2's idk how you found that on summit...if you go to the main oxygen sensor page they say they only sell genuine delphi parts which delphi makes delco ****

i cant throw that on here due to the company not being a sponsor

Elliott's94Z

iTrader: (12)

Well they do indeed sell "Catco" here is a link to the site with the o2 sensor that popped up after I put in the part number from the link you sent me. Maybe it's something they compare it too.
http://store.summitracing.com/egnsea...=25312184&x=13

Formula Freak

I think my original O2's are acting a bit lazy.When my motor is cold the car runs absolutely fine but when warmed up in stop and go traffic it will slightly miss at idle and sometimes hesitate on part throttle.My in-town gas mileage sucks big time too,about 10 or 11 MPG.Got black soot on my exhaust tips too.

Are these signs of O2's acting up?

ThoR294

iTrader: (6)

my stupid rear O2 (bank 1 sensor 2) sets a heater circuit code every once in a while. POS i just clear it every so often ha