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International Automotive Technicians Network
Re: Help with Negative Fuel Trims
Posted to Technical Discussion Forum on 6/26/2013

Change the oil, maybe more than once. If you block off pvc, the trims should return to normal. Notice I said block off, not simply pull and create a vacuum leak.

What you have is excess fuel in the crankcase at this point and as the oil heats up, the excess ... Login to read more.