Need some advice. I'm failing for high hydrocarbons at idle. I have high flow cats, no pre cats.. Recently deleted the EGR and AIV valves. Since then I don't pass emissions. Will the new tune from Concept Z with the AIV delete and dual pop be enough to get it through? i read that if the tune thinks the AIV's are still there, the O2's will add 10% more fuel at idle. Is it just the lack of cats causing me grief? I have twin pop and a selin converter set to average at the moment. Also, Concept Z said they can't pass in AZ with high flow cats..
Follow Ups
Emission problems.. New tune being added - fastrnu9001:00:44 05/23/14