What symptoms does a bad oxygen sensor cause?
Thread Starter
Intermediate
Joined: Feb 2011
Posts: 38
Likes: 0
From: Milton, FL
What symptoms does a bad oxygen sensor cause?
I have a '92 that started out having a brief miss/studder at steady throttle, but not under acceleration. Replaced the plug wires, and now that problem has almost disappeared, but now at idle (engine at running temperature) it runs very rough, especially in gear sitting at a stop light etc. When cold (at startup), it doesn't miss at all. Could it be a bad oxygen sensor, and if so, how many does a '92 LT1 have? Thanks.
Drifting
Joined: May 2005
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From: Chicago Executive Airport, formerly known as Palwaukee
No-IL Events Coordinator
St. Jude Donor '12-'13-'14-'15-'16-'17
Is your CEL illuminating?
A defective O2 sensor will usually set a code.
Should be two (2) oxygen sensors, left side & right side.
There are several other items which will cause a warmed up, bad running engine.
A defective O2 sensor will usually set a code.
Should be two (2) oxygen sensors, left side & right side.
There are several other items which will cause a warmed up, bad running engine.
Thread Starter
Intermediate
Joined: Feb 2011
Posts: 38
Likes: 0
From: Milton, FL
My check engine light finally did come on but I haven't gotten it to my mechanic yet to decipher the code. It has a relatively new opti-spark, new plugs, new wires, new injectors, and a relatively new TPS. Not much left to go bad but the O2 sensor(s), I hope.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Don't mean to jump the gun but the symptoms do sound like a bad opti. Especially when it's OK cold and then runs bad at temperature. Is the opti an
AC delco (OEM) or a copy of foreign made. Just a thought.
Does it kick or buck under accelleration when hot in hi gear?
It may set no code especially if the cap is going bad.
AC delco (OEM) or a copy of foreign made. Just a thought.
Does it kick or buck under accelleration when hot in hi gear?
It may set no code especially if the cap is going bad.
Last edited by pcolt94; Nov 13, 2012 at 06:01 PM.
Thread Starter
Intermediate
Joined: Feb 2011
Posts: 38
Likes: 0
From: Milton, FL
Don't know if the the opti is OEM or not, but it is fairly new. Will have to check on that. My mechanic will scan it for free, as opposed to $100 down at the GM dealership. It doesn't miss a beat under any level of acceleration, not matter how hard or easy.
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Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Good find, that actually happened to me a few weeks after I did an opti also. I just had a miss to but did not have any other problems. I thought that was strange the way it backed out as I had checked everything initially so well.