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1990 B250 black smoke bad gas mileage?

engine light flash code 51 a lean air/fuel mixture has been indicated by an abnormally rich correction. this a 1990 B250 van with 5.2 tbi I have replaced injecters,timing is right went from 17/18 to 8/9 mpg.

Malcolm Squires
July 2006
Also could be a vacum leak in system

bg
July 2006
Check the fuel pressure regulator @ the injector rail

bg
July 2006

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