Ken 2007-08-20 21:52:04
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.
Maxpower 2007-08-20 21:52:16
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.
Ken 2007-08-20 22:10:39
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
Ken 2007-08-20 22:10:59
Well, now we have no Neons. The 2003, aka the blue t***, 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