Hey all, I have a 06 5.4l with 162,000 miles. My question is that I bought a COP and I've been having it miss on 2 cylinders so far. Could it be bad? It is a ford motorcraft one. It has a good connection. I put it on # 6 cylinder and it was missing bad. Then put old one back on and put the new one on # 1 cylinder. And it is missing real bad. So is it the COP? My old ones haven't missed as bad as this new one. Thanks. Travis

 

It is possible to have a bad one right out of the box.

 

Thanks. I just didn't expect it. I thought something else was wrong but I diagnosed it. It misses way worse than my old ones

 

Do you think it could be plugs?

 

Do you think it could be plugs?

Speaking of bad parts out of the box.... I bought a new clutch master cylinder for my s10 saturday. Came home, installed it, tried to bleed it and nothing. Had a nice stream coming from slave cylinder but no pedal. Ended up getting another one and it worked perfectly.

 

I had the plugs done about 50,000 miles ago. I know I need new COP's but man when I put that new one on it made the problem 10 times worse. I have a slight miss but not big enough one to throw a CEL. But I'm going to email the seller and see what happens. That's sucks about your s 10. You would expect brand new thongs to work but hey where only human.

 

It was very frustrating to say the least. Hopefully you figure out your problem bud.