Re: Failed smog test - To many hydrocarbons at idle - Saab 900 Bulletin Board - Saabnet.com
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Re: Failed smog test - To many hydrocarbons at idle
Posted by JCB (more from JCB) on Wed, 28 Feb 2001 11:45:41
In Reply to: Failed smog test - To many hydrocarbons at idle, Cal, Wed, 28 Feb 2001 05:11:51
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First, were the engine and cat both at maximum efficiency before the test? If not, this may be the problem. Engines run richer when cold and the CAT is far less efficient until it is hot. I assume the engine was warm (normal operating temp), however the CAT may not have been hot. I have my car done by appoinment and drive it for a few miles just prior to the test to be sure...
Otherwise check everything that could cause rich conditions. This includes the O2 sensor, FPR, AMM, and engine temp sensor. If these are all normal, a partially clogged injector is a possibility (inefficient spray patterns result in incomplete combustion).
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