Lean bank one.. 2000 4.3L Silverado

By RED7218
February 13, 2014 in 1999-2013 Silverado 1500 & Sierra 1500

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RED7218

Posted February 13, 2014

Got intermited Lean bank one (drivers side) diagnositic code.along with a intermitted high idle (its a 5 speed). It gets much worse whe nthe temperature drops below freezing. I suspect I've got a EVAP vacuum leak but don't own a smoke machine to test it and I can't find it otherwise. What would happen if I put a vacuum cap on the evap purge solinoid inlet to isolate the evap from the engine and see if my driveablity issues go away.

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