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Emissions Help
Trying to get through emissions but have question,
I have 75 2.0, the emissions controls are removed, 74 heat exchanger/exhaust installed. Only failing on CO at idle, first test was 4.5%, checked, adjusted, and verified everything, reset idle mixture on ECU, today CO was 3.05%. 91 octane gas, at running temp. Need to bring CO to 2.20% to pass, Is it possible? I have read i can put 2000 ohm adjustable pot to lean out idle more than ECU allows,
Thoughts appreciated,
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