Is your car throwing codes or are you having a hard time passing your state or county emission test? Ask how to fix it here.
Post Reply
Junior Admin
Posts: 16109
Joined: Sun Oct 24, 2004 8:53 pm
Location: Baltimore, MD


Post by racer12306 » Sat Feb 03, 2018 12:07 pm

A “friends” car has been throwing this code for probably 3-4 years.

Is that ok?

Last time emissions came up the computer may have been reset and then driven for a couple weeks keeping the gas above 3/4 tank until the readiness monitors were ready.
Member of Spork Racing
Forum issues: racer12306@2gn.org
Forum Behavior
Support your favorite forum, DONATE!

User avatar
2009 Platinum Contributor
Posts: 12737
Joined: Sat Dec 25, 2004 8:58 am

Re: P0440

Post by BlackRoseRacing » Thu Feb 08, 2018 1:07 am

The large evap leak could be one of the larger diameter rubber hoses on the evap canister which also houses the leak detection pump. It could also be a rotted fuel neck.......
"Technically" it's not safe due to the gas fumes that may leak from the hoses, BUT if the "friends" car has made it this long with the leak not causing further issues I would not worry to much about it (especially if you don't smell gas) But also keep in mind that when the check engine light is on, the pcm runs in a different spark and fuel map to help keep the motor in "safe" operating conditions.
If you are able to get the car up in the air on a lift, take a look at the hoses and the fuel neck. The hoses would be dry rotted and split and the fuel neck would have rust holes in it. If you can't get the car on a lift, you will need to jack the car up on the passenger rear area to be able to look at the eval canister for the rubber hoses.

User avatar
Junior Admin
Posts: 3039
Joined: Sat Nov 19, 2005 7:49 pm
Location: Southeastern MA

Re: P0440

Post by jonnymopar » Thu Feb 08, 2018 8:42 am

I had a 0441 on my car intermittently for years. It ended up being a dry-rotted and cracked hose that I would have never found. I ended up having to bring it to the dealer to have the system smoke tested. It was a small crack in one of the hoses going to the NVLD (or Leak Detection Pump for non-NGC cars). Worse, the crack was facing up, so I saw absolutely nothing wrong from the underside of the car. So give it a real good look.
Jon J.

2003 Neon SXT - new home, new owner. Thanks for everything, old friend.
1989 Daytona ES - 2.4L/A555 swapped

Official "I'm Going To Drive My Neon Until Jerry Buys It" Club Member #11

occasional demons
Junior Admin
Posts: 20269
Joined: Thu May 03, 2007 12:14 pm
Location: Ashland Ohio

Re: P0440

Post by occasional demons » Thu Feb 08, 2018 8:52 am

When my purge flow valve was not connected to vacuum, the CEL/code would come on for that, every 6 months or so. But it never made any noticeable impact on how it ran, or fuel mileage. If the CEL didn't work, you wouldn't have known there was any issue at all. :dontknow:
Olha Koba, a psychologist in Kyiv, said that “anger and hate in this situation is a normal reaction and important to validate.” But it is important to channel it into something useful, she said, such as making incendiary bombs out of empty bottles.
2000 Neon MTX swap with '02 R/T PCM
1999 neon coupe 2.4 swap
2021 Forester

Posts: 21
Joined: Tue Apr 03, 2018 10:03 pm

Re: P0440

Post by rondert » Mon Nov 26, 2018 2:33 am

Had the same issue. I ended up replacing the evap purge solenoid.

Post Reply

Return to “Emissions”