http://www.aa1car.com/library/2000/ic60032.htm
Harder to diagnose are elevated oxides of nitrogen (NOX) emissions. Causes
here may include a defective EGR valve, EGR vacuum solenoid or motor,
plugged EGR ****ts in the manifold, over-advanced ignition timing or engine
overheating.
read here too http://www.car-forums.com/s9/t2590.html
"William Noble" <nobody@[EMAIL PROTECTED]
> wrote in message
news:47354bce$0$16722$88260bb3@[EMAIL PROTECTED]
> let me try saying this again - NOX is not an O2 sensor issue - it's
timing
> related, retarding the timing will fix the problem, just flip the switch
> to the retarded position
> <alordofchaos@[EMAIL PROTECTED]
> wrote in message
> news:1194622362.849083.18620@[EMAIL PROTECTED]
>> On Nov 7, 7:29 pm, "ignatz" <bobthea...@[EMAIL PROTECTED]
> wrote:
>>> Hi ! Can anyone out there help me on NOx readings on my 924S? Just
>>> barely
>>> passed a year ago - now 1850 where max. is 1250- runs great - maybe
just
>>> a
>>> little hot - any ideas are appreciated. It is driven about 2000 miles
a
>>> month, so not from disuse. thanx, ignatz
>>
>> It could be 02 sensor running the car lean - they're a 30k miles
>> service item.
>>
>> Make sure your exhaust is hot when you test... running an hour on the
>> highway right before testing might help the cat. You might also want
>> to make sure your cat is OK, not plugged, etc
>>
>> Could also be a vacuum leak causing a lean condition.
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