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SVTPerformance's Chain of Restaurants
Road Side Pub
Emissions issue 99 4 Runner
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<blockquote data-quote="wundrbird" data-source="post: 16355326" data-attributes="member: 18025"><p>Since high NOx production is caused by high cylinder temps, try tuning up the cooling system.</p><p></p><p>Flush the cooling system to get rid of buildup, and make sure there are no clogs. Buildup can create hot spots around the cylinders.</p><p></p><p>Fill with the proper mix of distilled water and antifreeze. Too high a water concentration might allow for boiling and create hot spots. Too high a coolant concentration can cause a blanket effect and not take heat away from the cylinders.</p><p></p><p>Replace the coolant temp sensor. If it's weak or bad, it's sending poor or no signals to the computer.</p><p></p><p>Get a new thermostat, maybe one that opens at a lower temp. An old, worn thermostat might allow the engine to get too hot before opening.</p></blockquote><p></p>
[QUOTE="wundrbird, post: 16355326, member: 18025"] Since high NOx production is caused by high cylinder temps, try tuning up the cooling system. Flush the cooling system to get rid of buildup, and make sure there are no clogs. Buildup can create hot spots around the cylinders. Fill with the proper mix of distilled water and antifreeze. Too high a water concentration might allow for boiling and create hot spots. Too high a coolant concentration can cause a blanket effect and not take heat away from the cylinders. Replace the coolant temp sensor. If it's weak or bad, it's sending poor or no signals to the computer. Get a new thermostat, maybe one that opens at a lower temp. An old, worn thermostat might allow the engine to get too hot before opening. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Emissions issue 99 4 Runner
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