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Re: Ford 4.6 backfire on startup & wierd fuel trims
Posted to Technical Discussion Forum on 11/28/2007

It sounds like a MAF [...] enough to rule it out,just disconnect it and let it set a code ,then let it sit overnight and see what it [...] take a look at the trims after it has set the code ,I usually find that they come back to normal while running in a defa... Login to read more.