Watt is a cpv valve on aford f250 engine - F-250 Ford Cars & Trucks

Diagnostic Test Code (DTC) P0496 means that there is purge flow through the Evaporative Emissions System (EVAP) during non-purge. The Powertrain Control Module (PCM) measures fuel tank pressure by reading the voltage from the Fuel Tank Pressure Sensor (FTP). The PCM controls the pressure by opening and closing the EVAP Canister Purge Solenoid Valve (CPV). It accomplishes this by grounding and un-grounding the control circuit to the CPV. When the CPV is open, engine vacuum is applied to the EVAP canister and ultimately, the fuel tank itself. When this happens the pressure inside the tank drops, causing a voltage change in the FTP sensor.
This code sets when there is a pressure drop in the tank when the CPV is commanded closed (there should not be any vacuum applied).

The code can actually be caused by several things. It could be caused by a faulty FTP sensor giving false readings to the PCM. It can be caused by a voltage drop in the FTP sensor circuit caused by wire corrosion or a bad/corroded connector, etc. It can be caused by a short to ground in the CPV control circuit, causing the CPV to be "ON" all the time. It can be caused by a CPV that is just plain stuck and will not close properly.

A faulty or "stuck" CPV is the most likely cause of the problem however, the rest of the circuits and sensor involved should be checked for proper operation before replacing any parts. (It would be a total waste of your money to replace the CPV only to find that you have a shorted control circuit.)

put a few squirts of washing up liquid into the oil and half a pint of diesel ,run for a couple days and if the noise stops then change the oil for a detergent petrol/diesel oil ,and the filter .Then change the oil every 6000 miles with a filter every third oil change but only use a cheap oil nothing expensive and ignore anyone who say use this expensive oil it only needs changing every 20.000 miles as this is what happens it builds up clag in the engine and gums up the hydraulic tappets along with everything else ,do it my way and the engine will run for ever

could be a number of things, rod knock, too much gap in spark plug, or valve clatter

There are fuses under the hood on passenger side and inside the van. Ours quit working and my husband figured out it was the switch.

EGR is maybe stuck open. disconnect the vac hose at the EGR valve and see if the idle smoothes out. If the EGR is sitcking open, thats a vac leak. If that fixes it, replace the EGR solenoid valve.

use a propane tourch dont light it start the truck
open the hood
slowely move the torch arround the top of the motor
as you hit the vac leak the engine will start to speed up since it is getting propane and reg fuel
the closer you get to the leak the faster the motor will go
and wala you found the broken or disconected hose

Yes that is possible. Did you try and hook up lines together that go into the valve to see if it would run. Also check to see if there is fuel to injectors.

open and close the valve on the filter a few times be sure to make sure its closed fully

you should be able to find it on the valve covers

G

remove the rh valve cover, unscrew the sensor, replace the valve cover.