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JBurer JBurer is offline
Registered User
Join Date: Nov 2008
Location: Austin, TX
Posts: 205
Emissions Fail - Advice welcome!

I took the car in for the emissions test earlier today and came out "failed". My NO levels look to be the issue. Was hoping some of you had already been down this path and could advise on items to try. All I have to pass is the 2-step testing procedure (ie. idle sniffer test and 3500rpms steady throttle) and not the roller/load test.

The car has a programmable EFI system, fairly stock motor and a high flow catalytic converter in the system. Recent plugs and plug wires.

To reduce NO emissions, do I want to lean the idle out to stoich and advance the timing?
Are there any additives members have had success with in the past?
Old 10-03-2009, 05:12 PM
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