GTA91

iTrader: (1)

My other post is below... codes 22 & 33. My car is running very bad lately. Horrible stumbling and missing throughout range. I've replaced:
-cap/rotor
-plugs
-wires
-fuel filter
-TPS
-MAP
I still need to check injectors and fuel pump. Question is: can a old/bad O2 sensor cause all this? I've never replaced it since I bought the car (1.5 yrs ago) and was wondering if that could cause all this? Also, what do I use to remove it? I've looked at it before and it looked like it would be hard. Thanks for any help, I need some repsonse so I can work on it tomorrow(sat.) THANKS

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'91 GTA:
www.fbody.com/members/91WS6GTA

JETHROIROC

A bad O2 sensor can definitely cause driveability problems, although I'm not sure it is your problem. However, if you've never replaced it and don't know when it was replaced last IMO you should do it. Get a Delco one, not a Bosch since the body on them is fatter and longer and even more of a PITA to put on. The Delco sensor has a very trim profile that works well in tight areas. Use a box end wrench to take the old one off and put the new one on. I had several different brands of 45* offset box-ends and best I recall only one worked well because of the way it was machined. I think it was a Craftsman but it could have been a PM from Wal-Mart. Hope this helps.

Z's r Best

shouldn't you get a check engine light and code for a bad O2 sensor? Our 83Z does (2 times over the years) when the sensor went bad. On my 81Z (check engine light disconnected by previous owner) a sudden problem with pinging (spark knock) signals a bad O2 sensor. On the other hand (and in the Richmond, VA area) the O2 sensors from parts stores (Bosch) are only about $20 to $25 vs. the $50 plus the dealer wants for Chevy's version. Might be different in your area.

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Z's r Best

JETHROIROC

I got my Delco for under $30 at Advance auto parts. Mine's a '90 dual cat car so the O2 sensor may be different to get to than yours, but I found the Bosch was very hard to work with in such a tight area. More than likely a bad O2 will throw a code, but I've found this isn't always the case.