On Mon, 21 Apr 2008 07:34:51 -0400, Dan Wright <dan.wright@[EMAIL PROTECTED]
>
wrote:
>I had high NOx (albeit on a 94 Mazda Protoge). Catalytic converter
>solved it.
>
>DW
>
>janka wrote:
>> i recently did the emissions test here in ontario and my car got a
>> fail grade due to high NOx leves. I’ve already changed the EGR valve
>> for a new one already. i was wondering if anyone else had some good
>> tips for fixing an NOx emissions problem with these cars? or if
>> anyone’s had experience with this problem and knows which sensors
>> might need chaning/any other probable causes to this problem. as the
>> subject says its a ’93 ford Taurus 6 cylinder, 3.0L GL. any tips
would
>> be appreciated =)
>>
NOX is GENERALY the easiest to fix.
Only one thing causes NOX - high temps in the combustion chamber.
Several things can contribute to this.
High operating temps or lack of EGR are the most common.
Extreme lean mixture can contribute to high operating temps. So can a
bad rad, bad water pump, bad fan. etc.
Almost all engines will produce SOME NOX under normal conditions -
some more than others - so a reducing bed catalyst is used to clean up
the exhaust.
If the reducing bed is dead, high NOX can result. The catalyst CAN
still be working for CO/hc reduction (which is an oxidizing
catalyst)and yet fail NOX.
If you have high NOX, verify the EGR is working, verify operting
temperatures, check for oxygen leaks, and replace the converter if
necessary.
** Posted from http://www.teranews.com
**
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