Posted by oldproudvet on January 29, 2018 at 09:17:12 from (206.188.253.91):
In Reply to: F250 - exhaust posted by dhermesc on January 29, 2018 at 07:12:47:
O2 sensor turns the injectors off and on, around 10 times a second in order to "trim" the fuel mixture. When sensors get "lazy" due to mileage and deposits, they cycle a lot less and your fuel mileage is in the tank. A slight ex leak will introduce air into the ex thus triggering a lean signal and the sensor will go full rich. I would certainly pick up an ex spud and weld it into one side at least. Ideally any set of headers should have a crossover or balance tube connecting them to help scavenge the exhaust. That's the ideal place to spot it. Something is obviously telling it to go stupid rich. I'm not sure if if the 351 uses the automotive mass airflow type of sensor or shares the 460s older EECIV speed density system. Either way try and correct the thing. Cat converter on this truck has no sensor in it, just the mixture one between the cat and the engine. Ford uses a heated sensor, because it's not in the manifold but further downstream so the right one..............
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