High NOx and CO reading
11-05-2004, 08:14 PM
#2
Guest
Posts: n/a
Re: High NOx and CO reading
That is an odd combo. Timing and mixture factors usually raise one while
lowering the other.
My suspicion is that the catalytic converter is kaput - assuming it is a 3
stage cat. It is a common cause of high NOx and can certainly produce high
CO by virtue of not breaking each of those down. I mention about the 3-stage
cat because the third stage - when used - is to break down NOx.
Basically, NOx comes from advanced ignition or lean mixture, while CO comes
from rich mixture.
Mike
"Alex Marcuzzi" <amarc@aei.ca> wrote in message
news:418ba23d$1_4@aeinews....
>I just failed my emission test with high NOx and CO readings on a 1994
>Accord. Does anyone have any advice as to what could be causing this high
>readings.
>
> Thanks
> Alex
>
lowering the other.
My suspicion is that the catalytic converter is kaput - assuming it is a 3
stage cat. It is a common cause of high NOx and can certainly produce high
CO by virtue of not breaking each of those down. I mention about the 3-stage
cat because the third stage - when used - is to break down NOx.
Basically, NOx comes from advanced ignition or lean mixture, while CO comes
from rich mixture.
Mike
"Alex Marcuzzi" <amarc@aei.ca> wrote in message
news:418ba23d$1_4@aeinews....
>I just failed my emission test with high NOx and CO readings on a 1994
>Accord. Does anyone have any advice as to what could be causing this high
>readings.
>
> Thanks
> Alex
>
11-05-2004, 08:14 PM
#3
Guest
Posts: n/a
Re: High NOx and CO reading
That is an odd combo. Timing and mixture factors usually raise one while
lowering the other.
My suspicion is that the catalytic converter is kaput - assuming it is a 3
stage cat. It is a common cause of high NOx and can certainly produce high
CO by virtue of not breaking each of those down. I mention about the 3-stage
cat because the third stage - when used - is to break down NOx.
Basically, NOx comes from advanced ignition or lean mixture, while CO comes
from rich mixture.
Mike
"Alex Marcuzzi" <amarc@aei.ca> wrote in message
news:418ba23d$1_4@aeinews....
>I just failed my emission test with high NOx and CO readings on a 1994
>Accord. Does anyone have any advice as to what could be causing this high
>readings.
>
> Thanks
> Alex
>
lowering the other.
My suspicion is that the catalytic converter is kaput - assuming it is a 3
stage cat. It is a common cause of high NOx and can certainly produce high
CO by virtue of not breaking each of those down. I mention about the 3-stage
cat because the third stage - when used - is to break down NOx.
Basically, NOx comes from advanced ignition or lean mixture, while CO comes
from rich mixture.
Mike
"Alex Marcuzzi" <amarc@aei.ca> wrote in message
news:418ba23d$1_4@aeinews....
>I just failed my emission test with high NOx and CO readings on a 1994
>Accord. Does anyone have any advice as to what could be causing this high
>readings.
>
> Thanks
> Alex
>
11-06-2004, 07:52 PM
#4
Guest
Posts: n/a
Re: High NOx and CO reading
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<Wq2dnbWuk-QOuBHcRVn-2A@sedona.net>...
> That is an odd combo. Timing and mixture factors usually raise one while
> lowering the other.
>
> My suspicion is that the catalytic converter is kaput - assuming it is a 3
> stage cat. It is a common cause of high NOx and can certainly produce high
> CO by virtue of not breaking each of those down. I mention about the 3-stage
> cat because the third stage - when used - is to break down NOx.
>
> Basically, NOx comes from advanced ignition or lean mixture, while CO comes
> from rich mixture.
>
> Mike
>
> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
> news:418ba23d$1_4@aeinews....
> >I just failed my emission test with high NOx and CO readings on a 1994
> >Accord. Does anyone have any advice as to what could be causing this high
> >readings.
> >
> > Thanks
> > Alex
> >
egr ports are plugged, have to slide hammer out the plugs, clean
the ports and replug.
the egr system is in place to reduce nox, which is caused by
pressure and high temps.
Chip
> That is an odd combo. Timing and mixture factors usually raise one while
> lowering the other.
>
> My suspicion is that the catalytic converter is kaput - assuming it is a 3
> stage cat. It is a common cause of high NOx and can certainly produce high
> CO by virtue of not breaking each of those down. I mention about the 3-stage
> cat because the third stage - when used - is to break down NOx.
>
> Basically, NOx comes from advanced ignition or lean mixture, while CO comes
> from rich mixture.
>
> Mike
>
> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
> news:418ba23d$1_4@aeinews....
> >I just failed my emission test with high NOx and CO readings on a 1994
> >Accord. Does anyone have any advice as to what could be causing this high
> >readings.
> >
> > Thanks
> > Alex
> >
egr ports are plugged, have to slide hammer out the plugs, clean
the ports and replug.
the egr system is in place to reduce nox, which is caused by
pressure and high temps.
Chip
11-06-2004, 07:52 PM
#5
Guest
Posts: n/a
Re: High NOx and CO reading
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<Wq2dnbWuk-QOuBHcRVn-2A@sedona.net>...
> That is an odd combo. Timing and mixture factors usually raise one while
> lowering the other.
>
> My suspicion is that the catalytic converter is kaput - assuming it is a 3
> stage cat. It is a common cause of high NOx and can certainly produce high
> CO by virtue of not breaking each of those down. I mention about the 3-stage
> cat because the third stage - when used - is to break down NOx.
>
> Basically, NOx comes from advanced ignition or lean mixture, while CO comes
> from rich mixture.
>
> Mike
>
> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
> news:418ba23d$1_4@aeinews....
> >I just failed my emission test with high NOx and CO readings on a 1994
> >Accord. Does anyone have any advice as to what could be causing this high
> >readings.
> >
> > Thanks
> > Alex
> >
egr ports are plugged, have to slide hammer out the plugs, clean
the ports and replug.
the egr system is in place to reduce nox, which is caused by
pressure and high temps.
Chip
> That is an odd combo. Timing and mixture factors usually raise one while
> lowering the other.
>
> My suspicion is that the catalytic converter is kaput - assuming it is a 3
> stage cat. It is a common cause of high NOx and can certainly produce high
> CO by virtue of not breaking each of those down. I mention about the 3-stage
> cat because the third stage - when used - is to break down NOx.
>
> Basically, NOx comes from advanced ignition or lean mixture, while CO comes
> from rich mixture.
>
> Mike
>
> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
> news:418ba23d$1_4@aeinews....
> >I just failed my emission test with high NOx and CO readings on a 1994
> >Accord. Does anyone have any advice as to what could be causing this high
> >readings.
> >
> > Thanks
> > Alex
> >
egr ports are plugged, have to slide hammer out the plugs, clean
the ports and replug.
the egr system is in place to reduce nox, which is caused by
pressure and high temps.
Chip
11-06-2004, 11:10 PM
#6
Guest
Posts: n/a
Re: High NOx and CO reading
"Chip Stein" <chip@chipanddebby.com> wrote in message
news:5ddcea74.0411061652.2d0e7981@posting.google.c om...
> "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message
> news:<Wq2dnbWuk-QOuBHcRVn-2A@sedona.net>...
>> That is an odd combo. Timing and mixture factors usually raise one while
>> lowering the other.
>>
>> My suspicion is that the catalytic converter is kaput - assuming it is a
>> 3
>> stage cat. It is a common cause of high NOx and can certainly produce
>> high
>> CO by virtue of not breaking each of those down. I mention about the
>> 3-stage
>> cat because the third stage - when used - is to break down NOx.
>>
>> Basically, NOx comes from advanced ignition or lean mixture, while CO
>> comes
>> from rich mixture.
>>
>> Mike
>>
>> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
>> news:418ba23d$1_4@aeinews....
>> >I just failed my emission test with high NOx and CO readings on a 1994
>> >Accord. Does anyone have any advice as to what could be causing this
>> >high
>> >readings.
>> >
>> > Thanks
>> > Alex
>> >
>
>
> egr ports are plugged, have to slide hammer out the plugs, clean
> the ports and replug.
> the egr system is in place to reduce nox, which is caused by
> pressure and high temps.
> Chip
Although that doesn't explain the CO. Still, EGR is cheaper than a cat!
Mike
11-06-2004, 11:10 PM
#7
Guest
Posts: n/a
Re: High NOx and CO reading
"Chip Stein" <chip@chipanddebby.com> wrote in message
news:5ddcea74.0411061652.2d0e7981@posting.google.c om...
> "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message
> news:<Wq2dnbWuk-QOuBHcRVn-2A@sedona.net>...
>> That is an odd combo. Timing and mixture factors usually raise one while
>> lowering the other.
>>
>> My suspicion is that the catalytic converter is kaput - assuming it is a
>> 3
>> stage cat. It is a common cause of high NOx and can certainly produce
>> high
>> CO by virtue of not breaking each of those down. I mention about the
>> 3-stage
>> cat because the third stage - when used - is to break down NOx.
>>
>> Basically, NOx comes from advanced ignition or lean mixture, while CO
>> comes
>> from rich mixture.
>>
>> Mike
>>
>> "Alex Marcuzzi" <amarc@aei.ca> wrote in message
>> news:418ba23d$1_4@aeinews....
>> >I just failed my emission test with high NOx and CO readings on a 1994
>> >Accord. Does anyone have any advice as to what could be causing this
>> >high
>> >readings.
>> >
>> > Thanks
>> > Alex
>> >
>
>
> egr ports are plugged, have to slide hammer out the plugs, clean
> the ports and replug.
> the egr system is in place to reduce nox, which is caused by
> pressure and high temps.
> Chip
Although that doesn't explain the CO. Still, EGR is cheaper than a cat!
Mike
11-08-2004, 04:43 AM
#8
Guest
Posts: n/a
Re: High NOx and CO reading
"Alex Marcuzzi" <amarc@aei.ca> wrote in message news:418ba23d$1_4@aeinews....
> I just failed my emission test with high NOx and readings on a 1994
> Accord. Does anyone have any advice as to what could be causing this high
> readings. Thanks Alex
CO is high, could be an inoperative O2 sensor. NOx is high, could
be an inoperative EGR valve, carbon deposits, over advanced timing,
cooling system too hot, lean mixture, cat-converter, or any mixture of
the above. An inoperative O2 sensor could have worn out the cat-
converter.
> I just failed my emission test with high NOx and readings on a 1994
> Accord. Does anyone have any advice as to what could be causing this high
> readings. Thanks Alex
CO is high, could be an inoperative O2 sensor. NOx is high, could
be an inoperative EGR valve, carbon deposits, over advanced timing,
cooling system too hot, lean mixture, cat-converter, or any mixture of
the above. An inoperative O2 sensor could have worn out the cat-
converter.
11-08-2004, 04:43 AM
#9
Guest
Posts: n/a
Re: High NOx and CO reading
"Alex Marcuzzi" <amarc@aei.ca> wrote in message news:418ba23d$1_4@aeinews....
> I just failed my emission test with high NOx and readings on a 1994
> Accord. Does anyone have any advice as to what could be causing this high
> readings. Thanks Alex
CO is high, could be an inoperative O2 sensor. NOx is high, could
be an inoperative EGR valve, carbon deposits, over advanced timing,
cooling system too hot, lean mixture, cat-converter, or any mixture of
the above. An inoperative O2 sensor could have worn out the cat-
converter.
> I just failed my emission test with high NOx and readings on a 1994
> Accord. Does anyone have any advice as to what could be causing this high
> readings. Thanks Alex
CO is high, could be an inoperative O2 sensor. NOx is high, could
be an inoperative EGR valve, carbon deposits, over advanced timing,
cooling system too hot, lean mixture, cat-converter, or any mixture of
the above. An inoperative O2 sensor could have worn out the cat-
converter.
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