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Old 12-21-2009, 16:22   #1 (permalink)
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2003 V10 ignition coil replacement

Hey everyone, new to the forum and I have some questions. First, I have a 2003 F350 with the V10. It is idling really rough and shudders when when driving at lower RPM. Also seems to have less power. Ran a diagnostic on it and the following codes came up - P0306, P0307, P0316. I know the first two are misfire codes for cylinders 6 and 7. Not sure what the third code means. Did some research and decided that the ignition coils for those cylinders need replacing. So my questions are - 1) Is this a correct assumption 2) If so, do you need to pull the fuel rail to replace these coils. #6 I can get to without doing so, but it appears #7 will require the fuel rail to be removed. 3) If the fuel rail does need to be removed, any suggestions or things I should know about this process. Thanks in advance for any help you might offer.
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Old 12-21-2009, 18:14   #2 (permalink)
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Re: 2003 V10 ignition coil replacement

Welcome to the forums. The coils can all be pulled out without removing the fuel rail. Try switching the coils to positions easy to get to. Then see if the missfire moves with them. I don't know what a P0316 is. Never heard of it.
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Old 12-21-2009, 18:53   #3 (permalink)
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Re: 2003 V10 ignition coil replacement

P0316 Engine Misfire Detected on Start-up (First 1000 Revolutions)
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Old 12-22-2009, 15:48   #4 (permalink)
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Re: 2003 V10 ignition coil replacement

Thanks for the welcome and replies. I changed the coils today and fired it up. It's like a totally different truck. I had been noticing symptoms for quite some time now and the dealer told me they could find nothing. I find that hard to believe since my little HyperTech tuner is what found these codes for me. Anyway, the truck runs like a champ now, and I really feel that it was running on 8 cylinders for some time now. I guess this would explain my crappy fuel mileage lately. Well, crappier than it already was! Thanks again.
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Old 12-22-2009, 16:03   #5 (permalink)
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Re: 2003 V10 ignition coil replacement

You're welcome. Glad you got it fixed.
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