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I'm new! 08 F350 V10 questions!

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  #31  
Old 01-02-2018, 10:59 AM
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Krewat Krewat is offline
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Those 35x codes, are circuit malfunction? The PCM might read a circuit malfunction when the COP misfires. So if the spring and boot, or plug, are causing a misfire bad enough, the PCM could think that's a circuit problem.

As people can tell here, I am leery of telling people to just replace coils for no reason. If they aren't verified bad, why replace them until you have to? I'd pull those coils out (pull them all, as a matter of fact) and make sure the boots are clean and the springs are not corroded.
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Old 01-02-2018, 12:45 PM
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Yeah I'm going to do the plugs anyway so i'll have a good look at them all. The 35x codes are ignition malfunction codes if i remember correctly. I'd have to pull it again to get the wording correct.
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Old 01-04-2018, 10:55 PM
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Okay, had some time to work on the truck this afternoon. Pulled a few more plugs and replaced them, most looked decent in terms of wear, probably less than 100k on them. So far none have looked as bad as #6 did. The seems to be staying off now, however it flashes intermittently if I go over 50-55mph. There's no stored codes but pending codes are 300 and 306. #6 must have something going on for that plug to look as bad as it did, and for that to be the recurring misfire. Anyone have any thoughts?

Most of the COP/boots/springs are in great shape. Just dirty. I don't think they're all the correct version though. I know there's brown and black ones, and I thought the brown ones were for older models but I could have that wrong.

Also, took a pic of the exhaust manifold on the driver side. I think I know where my ticking noise is coming from.


Leak on #10?
https://imgur.com/a/hNQDI

On the up side, I should be able to get it inspected tomorrow finally, and there's a good power increase since the last time I worked on it.
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