Re: Failed Emissions Test - Saab 900 Bulletin Board - Saabnet.com
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Re: Failed Emissions Test
Posted by JohnK (more from JohnK) on Tue, 7 Oct 2003 09:12:25
In Reply to: Failed Emissions Test, cullen, Tue, 7 Oct 2003 08:52:10
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If your car is a turbo, you can retard the spark from 16 to 14 btdc and with any luck you'll get the nox down enough to pass. If not a turbo and/or you have EZK ignition, then you need to go after the AMM, O2 sensor and or cat since timing is not adjustable.
Recently a board poster got his car to pass by running a high concentration of alchohol with the gas. Either methyl(denatured) or ethyl(drinkable) alchohol works. Try a 25% mix. This works on CO and HC as well.
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