Rich in O2 B2S1 Ok in O2 B1S1
06-05-2006, 09:54 PM
#1
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Rich in O2 B2S1 Ok in O2 B1S1 Running so rich in O2 B2S1, my car is choking up. I can see the injector duty cycles between the two to be about the same. So, I don't think the computer is causing this. However, I need to back in time some to see if anyone here can help. First of all, I installed a AEM A/F ratio gauge which does not work for some reason. It's on the driver's side y-pipe. I also installed autometer electric fuel pressure gauge and nitrous gauge. In addition, I installed a BMN window switch with 1rst gear lock out and Dyno tune's A/F ratio cutoff switch that is installed on one of the stock O2s. So with this said, can anyone help with as to why my computer is seeing B2S1 running so rich?
06-07-2006, 05:24 PM
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Not a bad ideal.....Ok...Here's what I got and maybe someone can help.
Inj B1 = 3.7 ms
O2B1=560mv
LTFT B1= -8.6%
STFT B1 = 7.8%
Inj B2 = 2.0 ms
O2 B2S1=1107 mv
LTFT B2 = -12.5 %
STFT B2 = -43.0 %
The first thing I am going to do is check the plugs. I believe they could be so fouled up that the passenger side plugs can't be firing properly and allowing my car to show to be rich.
Inj B1 = 3.7 ms
O2B1=560mv
LTFT B1= -8.6%
STFT B1 = 7.8%
Inj B2 = 2.0 ms
O2 B2S1=1107 mv
LTFT B2 = -12.5 %
STFT B2 = -43.0 %
The first thing I am going to do is check the plugs. I believe they could be so fouled up that the passenger side plugs can't be firing properly and allowing my car to show to be rich.
06-07-2006, 06:51 PM
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If you have an exhaust restriction on one bank then
the airflow will not be there, the fuel delivery is based
on gross airflow but trimmed bankwise (and only so far).
Biased airflow and average based fueling makes one
bank lean and one bank rich. If you have cats, check
the bricks.
the airflow will not be there, the fuel delivery is based
on gross airflow but trimmed bankwise (and only so far).
Biased airflow and average based fueling makes one
bank lean and one bank rich. If you have cats, check
the bricks.
06-07-2006, 07:42 PM
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ttujason02 - I believe you are right. Just got done pulling my spark plug wires off the the passenger side and found number 5 wire to be completely broken. Will continue with checking the plugs but I believe this is the problem.
jimmyblue - I have the utmost respect to your knowledge. I have read a lot of articles on here when it didn't make a whole of lot of sense, you cleared it up. So, with this said, what do you think of this problem with my spark wire on #5 cylinder. It is the same wire I have had problems in the past with it staying off the header. I found it again lying on the header tube. Thus contributing to its failure????
p.s. I have no cats.
jimmyblue - I have the utmost respect to your knowledge. I have read a lot of articles on here when it didn't make a whole of lot of sense, you cleared it up. So, with this said, what do you think of this problem with my spark wire on #5 cylinder. It is the same wire I have had problems in the past with it staying off the header. I found it again lying on the header tube. Thus contributing to its failure????
p.s. I have no cats.
06-07-2006, 08:23 PM
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The busted wire would dump unburned fuel and air to
that bank, make it appear lean (O2 content) and jack
the trims. But it doesn't explain the rich (if those are
WOT O2 readings) on B2. Maybe when you fix the wire
they will both be rich reading. A little fresh air goes a
long way in messing up O2 voltage.
that bank, make it appear lean (O2 content) and jack
the trims. But it doesn't explain the rich (if those are
WOT O2 readings) on B2. Maybe when you fix the wire
they will both be rich reading. A little fresh air goes a
long way in messing up O2 voltage.
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06-07-2006, 09:54 PM
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Originally Posted by jimmyblue
The busted wire would dump unburned fuel and air to
that bank, make it appear lean (O2 content) and jack
the trims. But it doesn't explain the rich (if those are
WOT O2 readings) on B2. Maybe when you fix the wire
they will both be rich reading. A little fresh air goes a
long way in messing up O2 voltage.
that bank, make it appear lean (O2 content) and jack
the trims. But it doesn't explain the rich (if those are
WOT O2 readings) on B2. Maybe when you fix the wire
they will both be rich reading. A little fresh air goes a
long way in messing up O2 voltage.
06-07-2006, 10:45 PM
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Bank 1 is dumping more fuel because the computer is trying to compensate for a misfire which it probably believes is from a lean mixture vs. a broken plug wire.
