Quote:
Originally Posted by RandallDee
My 06 5.4 is coming up on 90K miles. I bought it with 67K. When should the plug replacement job be done?
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I do mine at 50K or there abouts, time and weather being the biggest contributor to when its done. Its a chore to be certain but since I can go 2.5-3 years between plug changes which isn't a bit service interval. I do this to prevent the plugs from seizing inside the head more than thinking they're "worn out".
Apart from what's already been shared the wiring harness COP connectors are subject to the retention tab being broken during removal---they don't age well in their environment and become a bit brittle, snapping off during removal. If that tab isn't already broken its easy to do no matter how many times we've done this previously.
I have learned to be VERY careful when removing these, not squeezing the tab too hard and taking time to gently rock the connector until it comes loose. I've seen more than a few who remove the COP, boot and spring then laying it aside on the intake while changing plugs. Assuming the boots are in good shape this would work very, very well.
NAPA and other parts sellers offer repair connectors, their cost being about $20 each
for the Motorcraft or equivalent quality. Using proper crimping tools they're a bit of a challenge space-wise to install but something we can't ignore.