O2s lower on one side @ WOT???
Thread Starter
Teching In
Joined: Feb 2002
Posts: 49
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From: Music City
O2s lower on one side @ WOT??? what would cause O2s to be much lower in one bank rather than the other. I am getting .91 on one side and about .6 on the other. Engine sounds fine and feels strong. Could this be a bad o2 sensor, or possibly an exhaust leak? Anyone seen anything like this before?
That's a fairly large imbalance. A bad sensor might do that
but at WOT it should be hot and working. Check the
downstream sensor (if it's still there) and see if it
corroborates the story.
Side-side gross imbalance might come from a problem in
the "bridge" tube / pulse damper. Could also come from
one injector being "lazy" / crudded up and losing flow.
I would expect that kind of O2 reading (if true) to be
giving you strong KR.
but at WOT it should be hot and working. Check the
downstream sensor (if it's still there) and see if it
corroborates the story.
Side-side gross imbalance might come from a problem in
the "bridge" tube / pulse damper. Could also come from
one injector being "lazy" / crudded up and losing flow.
I would expect that kind of O2 reading (if true) to be
giving you strong KR.
11 Second Club
Joined: Jul 2002
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From: Beaver Falls, PA
Originally Posted by SS3520
what would cause O2s to be much lower in one bank rather than the other. I am getting .91 on one side and about .6 on the other. Engine sounds fine and feels strong. Could this be a bad o2 sensor, or possibly an exhaust leak? Anyone seen anything like this before?
Thread Starter
Teching In
Joined: Feb 2002
Posts: 49
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From: Music City
This is the first I have seen it, but I havn't loged a WOT run in a while. Here is what I logged. As yuo can see, no knock... Which is why I was thinking a bad sensor or leak. I have sims on the back, so no help there.
Engine Speed Knock Retard O2 Sensor - B1S1 O2 Sensor - B1S2 Ignition Timing Adv
2928 1.5 0.905 0.435 26.5
6241 1.4 0.925 0.435 26
4700 0.4 0.93 0.435 22.5
4534 0.3 0.93 0.44 23
4785 0.2 0.935 0.835 22.5
5002 0 0.92 0.835 24.5
5293 0 0.93 0.83 26.5
1349 0 0.035 0.435 18.5
4615 0 0.92 0.44 23
4890 0 0.935 0.435 23.5
5148 0 0.935 0.435 25.5
5525 0 0.93 0.435 27.5
5870 0 0.94 0.83 27.5
6210 0 0.935 0.825 27.5
6474 0 0.935 0.83 27.5
Engine Speed Knock Retard O2 Sensor - B1S1 O2 Sensor - B1S2 Ignition Timing Adv
2928 1.5 0.905 0.435 26.5
6241 1.4 0.925 0.435 26
4700 0.4 0.93 0.435 22.5
4534 0.3 0.93 0.44 23
4785 0.2 0.935 0.835 22.5
5002 0 0.92 0.835 24.5
5293 0 0.93 0.83 26.5
1349 0 0.035 0.435 18.5
4615 0 0.92 0.44 23
4890 0 0.935 0.435 23.5
5148 0 0.935 0.435 25.5
5525 0 0.93 0.435 27.5
5870 0 0.94 0.83 27.5
6210 0 0.935 0.825 27.5
6474 0 0.935 0.83 27.5
Thread Starter
Teching In
Joined: Feb 2002
Posts: 49
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From: Music City
Thanks for the replies. The more I think about it, the more I think it might be a bad sensor. I will try switching it. I have not removed the exhaust, so I don't think thats the problem and I know I have had normal reading since the last time I removed it.
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TECH Enthusiast
Joined: Dec 2002
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From: Chattanooga,TN
Could you have an exhaust leak and not hear it? I had the pass. side cat replaced after I got a SES code. I have the same problem except mine is 4.5 on side and .08 on the other and I got KR. I can't hear an exhaust leak and I couldn't see any suet around any connections/joints and the all the nuts were tight. I pulled off the O2s and was going to swap them but the pass. side is shorter than the drivers side. Will this cause any damageif not corrected? Would this also cause shitty gas milage?
waht are your o2 numbers? make sure they are both the fronts. why did u replace the cat? if your banks are that far off i would start with plugs and wires cuase my guess woudl be its not burning all the gas and could have made your cat get bad. jsut a thought
TECH Enthusiast
Joined: Dec 2002
Posts: 736
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From: Chattanooga,TN
They replaced the cat because the dealer said it was inefficient and was throwing a code. I haven been getting a code after that but my mpg is pretty bad. As far as reading the front or rear O2 or what their number were reading I couldn't tell you a buddy of mine was autotapping the car and he has that info. On the plugs and wires I changed the plugs out with some TR6s and the wires looked pretty good so I didn't change them. Where would you look for a vac leak. I here a what sounds like a leak but I can't tell where its coming from. Is there any kind of test I can do to find the source.