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2006 Ford F250 PU - 5.4L Erractic Misfire
Posted: Thu Jan 07, 2010 8:27 am
by COACHJON94
Has misfire that moves from cylinder to cylinder. using alot of gas. dealer said cats were bad, temporary cleaned out untill new pipe comes in, they were'nt bad. all o2 sensor readings go to zero after running few minutes. HELP! snow plow truck and its going to snow!
Re: 2006 f250 5.4 eractic misfire
Posted: Thu Jan 07, 2010 9:34 am
by steven kiser
check for crack in intake. huge issue with these. poss bad maf. welcome to the forum........
Re: 2006 Ford F250 PU - 5.4L Erractic Misfire
Posted: Thu Jan 07, 2010 10:13 am
by brianp87
What are the fuel trims?
Re: 2006 Ford F250 PU - 5.4L Erractic Misfire
Posted: Fri Jan 08, 2010 3:33 am
by steven kiser
a bad pressure regulator (fuel) may cause an issue like this. i've seen diaphragms leaking into the vac line loading the intake with fuel. this kind of sounds like something i'de be inclined to look into.......................