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International Automotive Technicians Network
Re: 93 volvo 940 high nox
Posted to Emissions Forum on 10/23/2014

Hi Aaron,

Have you checked the TAC blend door. Make sure it is in the cold air position. all the way closed to hot. it is not cold in San Diego. I have found skewed MAF sensors because of this. the egr vacuum signal was between 5 and 6 hg's on my bosses 93 ... Login to read more.