I recently bought my Tiburon in April after about a month of driving around i got a check engine light P0456. I have lots of people look at the car and ive done alot to it myself but i cant seem to figure out why the light keeps coming back. i found an airleak in the intake manifold gasket and i replaced it. seemed like it was pinched in the middle when originally installed caused the the top of the 3rd port to crack in two places. it helped with the violent shaking i had been experiencing but still seems to run a little rough. like i said ive had lots of people look at and everyone keeps saying its a harmless evap leak and it will be very expensive just to find it. ive noticed it has poor acceleration through its first 2 gears, sometimes my foot will be to the floor and its wide open but its just slowly accelerating ill let of completely and then hit the gas and it kicks in like it should. also one guy told me i had a crack in my exhaust manifold but he said that wouldnt explain the power/acceleration loss. does anyone know of any common problems?
ellisw
Try replacing the purge control solenoid valve... It's behind the intake manifold, and is connected to the throttle body with a vacuum hose (coming off the top).
p0456 is defined as a very small leak, and is either due to a fault PCSV(purge control solenoid valve), CCV (canister close valve), or FTPS (fuel tank pressure sensor.
p0456 is defined as a very small leak, and is either due to a fault PCSV(purge control solenoid valve), CCV (canister close valve), or FTPS (fuel tank pressure sensor.
Mine idles high (1500) when I start it after a cold start, but that's normal. It creeps down from 1000 as it warms up as well.
I would try changing the PCSV first, then the CCV, then the FTPS.
I would try changing the PCSV first, then the CCV, then the FTPS.
Sounds like it could be an issue with the charcoal evap canister. You do know we are supposed to change a filter back there every now and again. If not, it can get backed up. That and overfilling @ the pump can cause gasoline to overflow into this filter and clog crap up causing all kinds of weird issues.
I'll have to dig it up but there are some DIY's on this.
UPDATE:
So looking on HMAservice.com, under DTC this is what the "general desciption" is for the P0456 code:
Due to the increasing ambient temperature of the fuel and the return of unused hot fuel from the engine, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.
DTC Description
The ECM closes the Canister Close Valve (CCV) at the charcoal canister to seal off the evaporative emission system and then opens purge control valve (PCSV) to generate a vacuum in the fuel tank. After vacuum generation, the ECM measures pressure differential curve in the fuel tank and sets DTC P0442 or P0456 if the vacuum generated within a monitoring period increases above a defined threshold.
If same error code is set in the next driving cycle, the ECM illuminates the MIL.
I'll have to dig it up but there are some DIY's on this.
UPDATE:
So looking on HMAservice.com, under DTC this is what the "general desciption" is for the P0456 code:
Due to the increasing ambient temperature of the fuel and the return of unused hot fuel from the engine, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.
DTC Description
The ECM closes the Canister Close Valve (CCV) at the charcoal canister to seal off the evaporative emission system and then opens purge control valve (PCSV) to generate a vacuum in the fuel tank. After vacuum generation, the ECM measures pressure differential curve in the fuel tank and sets DTC P0442 or P0456 if the vacuum generated within a monitoring period increases above a defined threshold.
If same error code is set in the next driving cycle, the ECM illuminates the MIL.
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