5.4 misfire help please!!!!!!
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5.4 misfire help please!!!!!!
I have an 03 E150 code po307 which is misfire #7 cylinder and po316. Runs smooth at first when cold. Traded coils 8 for 7. Still misfire #7. Replaced injector no difference. Pulled spark plug looks like cheap autolite. There was oil around base of plug no water. Plug was not fouled or gas soaked it was clean? Any ideas please. Thanks for any ideas
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Joined: Jun 2008
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From: Ft Collins Co
you might check your o2 sensor if it was bad i dont know if it would pull up that code but it can mess with how it runs and it will make a difference if it is cold or not. also check your mass air flow sensor one of my buddys blow his engine because of a miss fire and everyone said it could not be that because it would not just mess with one but it did.
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Joined: Jan 2006
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From: Hampton GA
Make sure that the boot on the coil doesn't have a hole in it. If it does it may be arcing which will cause a misfire. Had one of those. Really hard to track down. Replace all of your plugs, boots and springs. The coils don't go bad that often.
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Joined: Jan 2008
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From: St Thomas ON Canada
I have had coil problems, too. Last Tuesday she started bucking and missing. I took it to the dealer, it was the #3 coil. Under warranty less than 20k mi. This morning, less than a week later, same thing! Probably will take it in this week. I'll post when I know what the problem is.
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