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Misfire, P0305 code

Tiny
MICHAEL FOX2
  • MEMBER
  • 2002 FORD RANGER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
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.
Friday, April 27th, 2018 AT 4:48 PM

6 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 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.
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Friday, April 27th, 2018 AT 7:26 PM
Tiny
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
Thanks.
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Friday, April 27th, 2018 AT 8:33 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Please keep us posted on your progress.
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Saturday, April 28th, 2018 AT 8:22 PM
Tiny
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.
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Sunday, April 29th, 2018 AT 6:25 PM
Tiny
MICHAEL FOX2
  • MEMBER
  • 4 POSTS
All the orther tests were in fine. Compression is good. No vacuum leaks, etc
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Sunday, April 29th, 2018 AT 6:27 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 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.
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Sunday, April 29th, 2018 AT 7:07 PM

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