EVAP System Malfunction 0440

Papa Rad17

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I recently finished a restore project on the intrigue. Besides the mess of suspension and brake parts I also replaced the fuel pump and valve cover gasket. Since my build I have tossing an 0440 "evap system malfunction" and noticed a 2-3mpg decrease. I have double checked everything under the hood and the harness is entirely reconnected, I really don't think I damaged anything while I was in there. I have tried a few things with the gas cap tightness with no luck. Because of vague the code is I have no idea where to start. Anyone else have issues like this? Could it be the system just disagrees with the new fuel pump?
 

Cutlass350

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New England! :-)
What year and what engine?
Fwiw, the Olds Dealer Service manual (often ~~$100 on ebay) has a detailed description of each error code, why it is set, and the tests the ECU/PCM does to determine/set the error code.

Imho, grab a copy now, before you can't find/get one.

Btw, evap errors can often be because of a bad hose. That "can be" a massive PITA to find.
 

Papa Rad17

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Great place to start looking. Good info, Thank you!
What year and what engine?
Fwiw, the Olds Dealer Service manual (often ~~$100 on ebay) has a detailed description of each error code, why it is set, and the tests the ECU/PCM does to determine/set the error code.

Imho, grab a copy now, before you can't find/get one.

Btw, evap errors can often be because of a bad hose. That "can be" a massive PITA to find.

Not a bad idea. No searching has yielded a better description the plain "evap system malfunction" in the scanner's book.
 

seen_bawl

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I got this error and fix it by changing the catalytic converter
Never fine back again
 
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