Misfire, P0305 code

2002 FORD RANGER
200,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
Avatar
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
I get a P0305 code. I have replaced the plugs, wires, coil pack, and fuel injector. It still gives me the code. Lost on what to do next.
Apr 27, 2018 at 4:48 PM
Advertisement
Avatar
CARADIODOC
  • CERTIFIED EXPERT
  • 34,306 POSTS
Do a compression test and a cylinder balance test. You could have a burned valve, worn piston rings, or wiped-out lobe on the camshaft.
Apr 27, 2018 at 7:26 PM
Avatar
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
Thanks.
Apr 27, 2018 at 8:33 PM
Advertisement
Avatar
CARADIODOC
  • CERTIFIED EXPERT
  • 34,306 POSTS
Please keep us posted on your progress.
Apr 28, 2018 at 8:22 PM
Avatar
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
I was thinking that cylinders two and five was on the same fuel injector. When I went back, I found out that cylinders two and six was on the same injector. Five was on another injector. I ordered another injector to see if that will correct the misfire in five. I must have an odd engine. I have never heard of an engine having six cylinders but only three injectors .
Apr 29, 2018 at 6:25 PM
Avatar
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
All the orther tests were in fine. Compression is good. No vacuum leaks, etc
Apr 29, 2018 at 6:27 PM
Avatar
CARADIODOC
  • CERTIFIED EXPERT
  • 34,306 POSTS
You have to have six injectors. Follow the fuel rail attached to them and you should run into the other three.

I cannot stress enough when you have a misfire after replacing an injector, always replace all of them at the same time as a flow-matched set. One by itself that causes a misfire flows a different volume of fuel. It is not defective.
Apr 29, 2018 at 7:07 PM