EVAP system on 2001 Chevrolet Blazer

I have a P0440 code.Evap System no flow during purge.

by in Rockford, IL on June 19, 2011
1 answer 1 comment
ANSWER by on June 19, 2011
Ashby3, Basically, this code indicates a large leak or large restriction that is preventing the EVAP system from developing / holding vacuum. Test to ensure your gas cap is secure. Other than that, a further diagnostic test must be performed using proper test equipment, including a smoke vapor machine. Anything other than that will be guess work. Good luck, -Dave
COMMENT by on March 04, 2012
Thanks, just guessing how much would that cost
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