Quote:
Originally Posted by xhifer
Thinking about installing a 160 thermostat on my 98 986 but a little concerned about smog because it's pre-2000 and still needs to be sniffed.
From research and experience, I know an engine pollutes a lot more when the engine is cold or cooler.
Anyone in CA with a pre-2000 986 and 160 degree thermostat passing smog no problem???
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Even if you install a 160 degree thermostat the engine will still reach the manufactures specified= engineered operating temp.
The anti polution system goes into closed loop operation well before that specified operating temp.
Closed loop is when the DME/ECU is monitoring and adjusting fuel/air ratios.
Which in turn regulate catalytic converter temperatures.
Which in turn control the three pollutants in the exhaust.
If you car is showing no CEL or pending codes, all systems are test ready, no exhaust leaks.
There is no reason for your car not to pass smog testing.
No matter which state your in or what test method is used.