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hauto
hauto, TECHNICIAN
Category: Pontiac
Satisfied Customers: 2727
Experience:  SELF EMPLOYED TECH, RAN MY OWN SHOP, HAVE 15 YEARS OF HANDS ON EXPERINCE
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code po440 evap emission control system malfunction what mite this be.

Resolved Question:

code po440 evap emission control system malfunction what mite this be.
Submitted: 4 years ago.
Category: Pontiac
Expert:  hauto replied 4 years ago.

Thanks for using JA

This could be an actual evap leak which can be due to a faulty fuel filler neck or a hole in one of the evap lines.

a faulty a vent solenoid or a fuel pressure sensor those are the possibilities.

the evap system should be smoke tested to eliminate a leak concern or find one.

Customer: replied 4 years ago.
what mite i be able to look for to narrow it down without smoke test
Expert:  hauto replied 4 years ago.

the naked eye will not spot a leak without the smoke, the filler neck can look rusted but may not be leaking, and to replace parts on a guessing basis can get expensive, not much you can do other than replacing a gas cap.

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