7/11/2023 0 Comments K621 ford engine codes list![]() ![]() ![]() If the plug wires are out of sequence, the explosion occurs at the wrong time. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. Each car maker uses a different techniques to check, but most often it's some type of fuel tank pressure sensor. To perform the test, the computer pulls a vacuum and checks to see if the vacuum holds. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.Įvaporative emissions systems test for a leak in the fuel tank and associated hoses. Parts or components should not be replaced with reference to only a P246C Ford DTC.
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