Quote:
Originally Posted by Rodsrsr
Are not the CATS more effective the hotter they get? I was always told to make sure the car is at least normal operating condition before testing.
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The cats are heated by exhaust gases, which do not change much in temperature as a function of coolant temperatures, they are more a function of air/fuel ratios.
The reasons for getting the car up to "normal operating conditions", or steady state as it is known in the trade, is to allow everything to come to equilibrium. Good examples of why this is important are the misleading results you get when you check cam deviation values or engine sump vacuum levels on a car that is not steady state.