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

2003 FORD EXPLORER
57,000 MILES
Avatar
RJLARGE
  • MEMBER
  • 2 POSTS
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
Oct 30, 2011 at 2:50 PM
Advertisement
Avatar
PROMECHANIC
  • ✓Experienced 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.
Oct 30, 2011 at 3:27 PM
Avatar
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.
Oct 30, 2011 at 4:22 PM
Avatar
PROMECHANIC
  • ✓Experienced 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.
Oct 30, 2011 at 6:13 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle