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Originally Posted by pavel
Hope someone is knowledgable about emissions......
Went through "Aircare" yesterday and passed! I was expecting to fail as my oxygen sensors are original (10 years old). The numbers are interesting but confusing. Here are the data:
240 second......... / Maximum // Vehicle ///Average passing ////Result
Driving test......... / Allowable //Reading /// Reading
Hydrocarbons...... / 0.5000 // 0.0588 /// 0.2433 //// PASS
grams/km
Carbon monoxide .. / 8.0800 // 0.7846 /// 3.8783 //// PASS
grams/km
Oxides of Nitrogen / 1.1200 // 1.0360 /// 0.4527 //// PASS
grams/km
You'll note that the Hydrocarbons (unburnt fuel) and carbon monoxide are both very low - roughly 1/10th allowable amounts. The oxides of nitrogen however are over double the average passing reading. Why would the NOx gasses be so high? Can anyone explain? Thanks.
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It is recommended that you run the engine on the road for 20 to 30 minutes beforehead so your cat convertor comes up to operating temperature.
Cats work best when hot. When they get older, the convertor does not work as well and is a pricy thing to swap out.
So what can you do? Show some love and spend some cash.
Your o2 sensors are at the end of life. Replacing the sensors can only help you with the emissions and your fuel efficiency.
New wires and spark plugs will also improve, as well as a oil change and a fresh air filter. So will properly pressurised tyres.
Until you rechip your LR, run with either Seafoam or Techron , use premium fuel, and enjoy your ride.
