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After market header on toy,OK with ref.but doesnt work.
CAP truck,83 toy 2.4l carb with pulse air system. Fails NOX at 15 and 25. Started by checking feedback system,Noticed air being injected all the time,found ground wire for pulse air valve piggybacked to [...] the wire,found when I feed ecm signal on O2 circut ... Login to read more. 
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