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Discuss 2003 Neon "EVAP Emission Control System Leak Very Small" in the alt.autos.dodge forum at Car Dealer Forums; My Neon, 49k miles, recently has activated the check engine light. Advance Auto read the ...
  1. #1
    Ken
    Guest

    Default 2003 Neon "EVAP Emission Control System Leak Very Small"

    My Neon, 49k miles, recently has activated the check engine light.
    Advance Auto read the OBDII and got a code “PO456 EVAP Emission
    Control System Leak Very Small” - I believe that is the correct code,
    I transcribed it into my maintanence log and no longer have the
    original printout. I know the description is correct although
    something tells me I might have transposed a number. Anyhow...

    I checked the gas cap and later replaced it. I checked all the hoses
    I could find under the hood. The large hose from the throttle body to
    intake manifold was loose (left that way by the dealer a couple years
    back when the rebuilt the transmission I believe) so I tightened it.
    Air cleaner is new and properly seated in place. I found no loose or
    cracked hoses as far as I could see. If I clear the light by lifing
    the battery lead it will stay off for about 2 weeks and then come back
    on with the same code.

    The local dealer has provided most unsatisfactory service on the
    numerous times the car was in for warranty work so I would rather not
    return it to them. I would appreciate any advice as to other things I
    might check. My other, and probably better, alternative is to trade
    the thing in on a Toyota.

    Regards,

    Ken

  2. #2
    maxpower
    Guest

    Default Re: 2003 Neon "EVAP Emission Control System Leak Very Small"


    "Ken" <taylor2jnk@hotmail.com> wrote in message
    news:qv5d239kukm6dj6jt481fv4v2il779usqr@4ax.com...
    > My Neon, 49k miles, recently has activated the check engine light.
    > Advance Auto read the OBDII and got a code "PO456 EVAP Emission
    > Control System Leak Very Small" - I believe that is the correct code,
    > I transcribed it into my maintanence log and no longer have the
    > original printout. I know the description is correct although
    > something tells me I might have transposed a number. Anyhow...
    >
    > I checked the gas cap and later replaced it. I checked all the hoses
    > I could find under the hood. The large hose from the throttle body to
    > intake manifold was loose (left that way by the dealer a couple years
    > back when the rebuilt the transmission I believe) so I tightened it.
    > Air cleaner is new and properly seated in place. I found no loose or
    > cracked hoses as far as I could see. If I clear the light by lifing
    > the battery lead it will stay off for about 2 weeks and then come back
    > on with the same code.
    >
    > The local dealer has provided most unsatisfactory service on the
    > numerous times the car was in for warranty work so I would rather not
    > return it to them. I would appreciate any advice as to other things I
    > might check. My other, and probably better, alternative is to trade
    > the thing in on a Toyota.
    >
    > Regards,
    >
    > Ken


    The fault code is a 0.20 leak. Very small and may only leak when the vehicle
    is cold. Once warmed up the rubber could seal and the leak not be found. A
    smoke machine is needed to locate this leak. The air cleaner has nothing to
    do with it. All emissions related hoses that carry vapors from the tank to
    the engine are effected. A purge control valve that is not seating its
    pintle may also cause this code to set and will not show a leak using the
    smoke machine . you could trade it in for a Toyota but they have the same
    system and in due time leaks will develop.

    Glenn Beasley
    Chrysler Tech



  3. #3
    Ken
    Guest

    Default Re: 2003 Neon "EVAP Emission Control System Leak Very Small"

    On Wed, 18 Apr 2007 20:55:32 -0400, "maxpower"
    <damnnickname@yahoo.com> wrote:

    >
    >"Ken" <taylor2jnk@hotmail.com> wrote in message
    >news:qv5d239kukm6dj6jt481fv4v2il779usqr@4ax.com.. .
    >> My Neon, 49k miles, recently has activated the check engine light.
    >> Advance Auto read the OBDII and got a code "PO456 EVAP Emission
    >> Control System Leak Very Small" - I believe that is the correct code,
    >> I transcribed it into my maintanence log and no longer have the
    >> original printout. I know the description is correct although
    >> something tells me I might have transposed a number. Anyhow...
    >>
    >> I checked the gas cap and later replaced it. I checked all the hoses
    >> I could find under the hood. The large hose from the throttle body to
    >> intake manifold was loose (left that way by the dealer a couple years
    >> back when the rebuilt the transmission I believe) so I tightened it.
    >> Air cleaner is new and properly seated in place. I found no loose or
    >> cracked hoses as far as I could see. If I clear the light by lifing
    >> the battery lead it will stay off for about 2 weeks and then come back
    >> on with the same code.
    >>
    >> The local dealer has provided most unsatisfactory service on the
    >> numerous times the car was in for warranty work so I would rather not
    >> return it to them. I would appreciate any advice as to other things I
    >> might check. My other, and probably better, alternative is to trade
    >> the thing in on a Toyota.
    >>
    >> Regards,
    >>
    >> Ken

    >
    >The fault code is a 0.20 leak. Very small and may only leak when the vehicle
    >is cold. Once warmed up the rubber could seal and the leak not be found. A
    >smoke machine is needed to locate this leak. The air cleaner has nothing to
    >do with it. All emissions related hoses that carry vapors from the tank to
    >the engine are effected. A purge control valve that is not seating its
    >pintle may also cause this code to set and will not show a leak using the
    >smoke machine . you could trade it in for a Toyota but they have the same
    >system and in due time leaks will develop.
    >
    >Glenn Beasley
    >Chrysler Tech
    >

    Thanks for the input Glenn. I can trace all the hoses on my 1980 MGB
    and tell you what they are for. I have not taken the time to map out
    the Neon. Guess I may have to.

    We have 2 Neons. The wife's '95 has been a great little daily driver.
    The 2003 has been an absolute POS. It was in the dealership 5 (five)
    times to fix the water leak which filled the passenger floorboard when
    it rained. The transmission quit at about 20K miles. The bushings in
    the front suspension arms disintegrated. The 4 speed auto transmission
    has never worked as I think it should - does not want to go into top
    gear below 45 mph etc.

    All in all this car is tied for first place as the sorriest, most
    aggravating cars I have ever owned (with a 1978 Ford Mustang II - that
    is BAD).

    Thanks again,

    Ken


  4. #4
    Ken
    Guest

    Default Re: 2003 Neon "EVAP Emission Control System Leak Very Small"

    On Thu, 19 Apr 2007 13:59:56 GMT, Ken <taylor2jnk@hotmail.com> wrote:

    >On Wed, 18 Apr 2007 20:55:32 -0400, "maxpower"
    ><damnnickname@yahoo.com> wrote:
    >
    >>
    >>"Ken" <taylor2jnk@hotmail.com> wrote in message
    >>news:qv5d239kukm6dj6jt481fv4v2il779usqr@4ax.com. ..
    >>> My Neon, 49k miles, recently has activated the check engine light.
    >>> Advance Auto read the OBDII and got a code "PO456 EVAP Emission
    >>> Control System Leak Very Small" - I believe that is the correct code,
    >>> I transcribed it into my maintanence log and no longer have the
    >>> original printout. I know the description is correct although
    >>> something tells me I might have transposed a number. Anyhow...
    >>>
    >>> I checked the gas cap and later replaced it. I checked all the hoses
    >>> I could find under the hood. The large hose from the throttle body to
    >>> intake manifold was loose (left that way by the dealer a couple years
    >>> back when the rebuilt the transmission I believe) so I tightened it.
    >>> Air cleaner is new and properly seated in place. I found no loose or
    >>> cracked hoses as far as I could see. If I clear the light by lifing
    >>> the battery lead it will stay off for about 2 weeks and then come back
    >>> on with the same code.
    >>>
    >>> The local dealer has provided most unsatisfactory service on the
    >>> numerous times the car was in for warranty work so I would rather not
    >>> return it to them. I would appreciate any advice as to other things I
    >>> might check. My other, and probably better, alternative is to trade
    >>> the thing in on a Toyota.
    >>>
    >>> Regards,
    >>>
    >>> Ken

    >>
    >>The fault code is a 0.20 leak. Very small and may only leak when the vehicle
    >>is cold. Once warmed up the rubber could seal and the leak not be found. A
    >>smoke machine is needed to locate this leak. The air cleaner has nothing to
    >>do with it. All emissions related hoses that carry vapors from the tank to
    >>the engine are effected. A purge control valve that is not seating its
    >>pintle may also cause this code to set and will not show a leak using the
    >>smoke machine . you could trade it in for a Toyota but they have the same
    >>system and in due time leaks will develop.
    >>
    >>Glenn Beasley
    >>Chrysler Tech
    >>

    >Thanks for the input Glenn. I can trace all the hoses on my 1980 MGB
    >and tell you what they are for. I have not taken the time to map out
    >the Neon. Guess I may have to.
    >
    >We have 2 Neons. The wife's '95 has been a great little daily driver.
    >The 2003 has been an absolute POS. It was in the dealership 5 (five)
    >times to fix the water leak which filled the passenger floorboard when
    >it rained. The transmission quit at about 20K miles. The bushings in
    >the front suspension arms disintegrated. The 4 speed auto transmission
    >has never worked as I think it should - does not want to go into top
    >gear below 45 mph etc.
    >
    >All in all this car is tied for first place as the sorriest, most
    >aggravating cars I have ever owned (with a 1978 Ford Mustang II - that
    >is BAD).
    >
    >Thanks again,
    >
    >Ken


    Well, now we have no Neons. The 2003, aka the blue turd, was traded
    for a Toyota Corolla. The '95 was donated to my step-son to use as a
    drive to work beater - better gas mileage than his truck.

    Good bye Dodge. Perhaps the Chinese will buy you - the did buy
    MG-Rover.

    Ken

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