4.2 Cylinder 3 misfire
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4.2 Cylinder 3 misfire
i got 97 f150 with 4.2 in it i been having trouble trying figure out the why i keep getting a misfire on cylinder 3 it first started missing between 45 and 55 mph replaced the spark plugs then the coil pack drove it a few miles drove fine then i decided to open it up a bit made it to 60 the miss was back so i replaced the wires did the same thing went for a good drive opened it up made it to 65 then the miss was back at this point im stumped before all this happened maybe a week before this started i was setting in walgreens parking lot had a misfire on cylinder 6 put new spark plugs in cleared it up but the plug in 6 was horrible it was gunked up on the tip when i got the truck in febuary its always had the egr code insuffcient flow im starting to think the ports are egr clogged up causeing it to dump into cylinder 3 has anyone else had this problem or any ideas thanks
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im gonna try to replace the injector see what happens ive replaced the other 3 you listed i got the egr code P0401 ( insufficient flow) ive been gettin it since i got the truck im gonna try replacing DPFE sensor i already replaced egr and im gettin suction from the little green hose on top of the egr and where it meets the red hose to go into what im thinkin is the egr solenoid when i take both hoses of there i got a strong suction
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