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- - COP's (https://www.f150online.com/forums/2004-2008-f-150/525542-cops.html)

phillyFX4

Jan 25, 2022 10:25 AM

COP's

my 08 F 150 5.4L V8 has almost 90K miles.....did my plugs around 8K ago.....

Is there any general rule of thumb on replacing the coil over plugs ?

thanks :beers:

glc	Jan 25, 2022 10:28 AM

When it develops a miss with known good plugs in it.

jmfox3

Jan 25, 2022 02:39 PM

And, if you put in new plugs when it starts, check the new plugs. Doesn't happen often but once in a great while. I have the brown boots and replaced one after 150,000 miles on a 2008. If you suspect a coil pack, clear the ODBC codes and move the coil pack to another cylinder. If the problem moves with the coil pack to the new cylinder then replace the coil pack...good luck.

phillyFX4

Jan 26, 2022 05:07 PM

thanks !

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