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Volvo 85 740 Non Turbo Nox Failures

Hello I live in Houston TX, I have taken my 85 volvo 740 to get Inspected
it passes everything Except Nox. Condition of the car includes A Semi-Cold start problem ( once warm it is ok ) The Spark Plugs are Black but not oily more like baked on carbon and gets worse towards the firewall. I have tried the stupid guarantee to pass crap that did not work I tried Alcahol in the tank low on gas that did not work . Please help !!! I do not want to scrap my College Car. :( I want to fix it up so my son can drive it next year I have cleaned the trottle body, Iac and everything else i can think of . Please Help...!!!






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