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Hello, I have an 03 Ford Explorer with the 4.6 8 Cyl and it seems to be missing and running rough.

Tiny
RJLARGE
  • MEMBER
  • 2003 FORD EXPLORER
  • 57,000 MILES
I stopped by Autozone and they said its showing codes P0306 and P0316. I dont have a ton of money to spend on diagnostics so Im wondering what this most likely is? If it was you what parts would you replace first? Thanks for any help you can give me!

Robert Large
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Sunday, October 30th, 2011 AT 9:50 PM

3 Replies

Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
An easy test you can try is to switch coils and spark plugs with another cylinder. See if the problem follows the coil. You can do this with the injectors too.
Sometimes this type of problem is caused by the PCM relay too.
I hope this helps.
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Sunday, October 30th, 2011 AT 10:27 PM
Tiny
RJLARGE
  • MEMBER
  • 2 POSTS
If I find that its just one coil/plug thats the problem would it be worth replacing them all. Or would that be a waste of time and money? I read that a tune-up is not called for until 100,000 miles.
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Sunday, October 30th, 2011 AT 11:22 PM
Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
I would probably just replace the one that is bad. If it happens again then I would maybe think about replacing them all.
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Monday, October 31st, 2011 AT 1:13 AM

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