Originally Posted by Ash575
2002 SCrew 5.4 V8 - 100,025 miles.
Last week my Service Engine Soon light turned on. I had a friend pull the codes with his reader and I had a P303 and P316. Doing my research I saw that they were the misfire detected codes for cylinder #3.
Search this board and on the internet I found that possible fixes to this problem is to change plugs and the COP which I did (replaced all plugs and the COP for #3).
Still have the service light on when I started it back up after I was done.
You have to have the code cleared to turn the CEL offWill have my friend check the codes again tomorrow (Sunday) and see if the are the same ones.
I guess my next step would be the fuel injector? Anyone else dealt with this issue and has some insight to what could be going on?
Also just so I make sure I did things right, can someone remind me the cylinder layout of the 5.4 V8? Was I correct in thinking that the odds are on the passenger side and evens on the driver side? With numbers one and two towards the front of the engine (so #3 would have been the second one back on the passenger side)? You changed the #2 cylinder
Best advice, Get yourself running by replacing the #3 cylinder COP (coil over plug), have the code cleared and see what happens from there. Next, I would change out all of your COP's. Your best bet is to buy them from Ebay. You will buy all 8 of them, between $70.00 to $75.00 dollars plus the shipping. There are a 2 sites on Ebay to get them for this price. There has been a bit of controversy lately about which site to buy from, so I will stay neutral and recommend you do some research and make your own decision.
You can research Ebay feedback and this site and make a decision from there.
Good luck and let us know how it works out for you.