G engine vin code. shhowing a p P0455 evaporative emission leak already changed gas cap with new one. checked for vaccum hose leaks and were none. car runs rough and acts like it miss fires. already replaced oxygen sensor, plugs and plug wires gas cap, egr valve,catalytic convertor. what could it ber????
The code is for a large leak in the fuel tank or evap system.
Some possible cause are - a leaking fuel tank, gas cap, hoses to and from the vapor canister and engine, and a faulty canister.
It's possible a valve is stuck open and allowing the engine to pull fumes in when the system is supposed to be closed, but if this were the case the computer should also set a code for that valve.
Here is the definition.
P0455 CHRYSLER Description
The Evaporative emissions (EVAP) system is design to prevent the
escape of fuel vapors from the fuel system. Leaks in the system, ca
allow vapors to escape into the atmosphere. The leak detection system
tests for EVAP system leaks and blockage.
During the
self-diagnostics, the Powertrain Control Module (PCM) first checks the
Leak Detection Pump (LDP) for electrical and mechanical faults. If the
first checks pass, the PCM then uses the LDP to seal the vent valve and
pump air into the system to pressurize it. If a leak is present, the PCM
will continue pumping the LDP to replace the air that leaks out. The
PCM determines the size of the leak based on how fast/long it must pump
the LDP as it tries to maintain pressure in the system.
Read more: http://engine-codes.com/p0455_chrysler.html#ixzz24EH3F11s
P0455 CHRYSLER - EVAP System Large Leak
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking Tech notes The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
Read more: http://engine-codes.com/p0455_chrysler.html#ixzz24EGzwluH
SOURCE: Mirage Mitsubishi 2000 1.8L Rough Miss when Idle
Might want to look for vacuum leaks. Most misfires that go away with gas are caused by manifold vacuum leaks. The cat code can also be caused by the vac leak. There are different methods to find them and not real easy-but one way is to get a can of carb cleaner spray and spritz around intake areas. When the carb cleaner finds the leak--the car will run good for just and instant. Could be a rubber line or a manifold gasket. Hope it helped. Thanks
SOURCE: rough idle
I had this problem with a Mazda I had and I did everything I could think of. Check for vac leaks again and then check air cleaner hoses. I suggest this, because I found mine right smack dab in the crevasse of the air intake for the air cleaner.
SOURCE: My 2007 Chrysler Sebring will
This depends on the problem , like a bad gas cap is not covered but so what a cap is cheap, take it to dealer and let them fix it for free or very cheap. most of the time its a valve, purge valve or vent valve, these are covered, take it before you hit 80,000. good luck.
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