Misfire

Reply Subscribe

Thread Tools

Search this Thread

Aug 15, 2009 | 05:24 PM

73effie

Thread Starter

Senior User

Joined: Jun 2004

Posts: 164

Likes: 0

From: yuba city, ca

Misfire

Hi all. I have a 2001 Ranger 4wd. It has been running rough. I read the code and found a code for cyl 5 misfire. I recently replaced the coil pak, the wires, and the plugs. How do I find what is causing this? It is a 3.0. Thanks.

eddie-

Aug 15, 2009 | 05:30 PM

aquanaut20

Cargo Master

Joined: Aug 2003

Posts: 3,263

Likes: 92

From: BC Canada

relocate the wire to a different plug/coilpack, reset CEL, if the miss fire follows replace the wire. If stays on same cylinder replace plug.

Note: I had similar problem until I used a tread chaser to clean the plug treads. Too much resistance for a good waste spark.

Aug 15, 2009 | 06:46 PM

BlackNGoldRules

Senior User

Joined: Jun 2008

Posts: 283

Likes: 0

From: Bethel Park, PA

If you still have a misfire after doing what aquanaut20 suggests, see if it's a bad fuel injector. I had a misfire a few years ago and replaced wires, plugs and coilpack and still had the misfire. Ended up being a bad injector. Just something to check if the other replacements don't work.

Aug 15, 2009 | 07:05 PM

95_Dually

Post Fiend

Joined: Mar 2006

Posts: 7,841

Likes: 0

From: Vacaville, Ca

I have a 2000 that threw the same code. The problem turned out to be the exhaust valves receding into the cylinder head. This is a common problem on the 3.0 motor I was told. I replaced the heads and the problem was solved. I tried all of the simple things first and nothing else worked.

Aug 15, 2009 | 07:21 PM

73effie

Thread Starter

Senior User

Joined: Jun 2004

Posts: 164

Likes: 0

From: yuba city, ca

How do I go about checking the injector? Do I use an OHM meter?

eddie-

Aug 15, 2009 | 10:09 PM

aquanaut20

Cargo Master

Joined: Aug 2003

Posts: 3,263

Likes: 92

From: BC Canada

Quote:

Originally Posted by 73effie

How do I go about checking the injector? Do I use an OHM meter?

eddie-

Did you check the wire and plug first?? Results??

Check injectors:

Noide lites check injector pulse,
Stethoscope, listen for injector valve clicking.
run Tecron or sea foam through fuel system

Report back findings,,,,,,

Aug 15, 2009 | 10:55 PM

73effie

Thread Starter

Senior User

Joined: Jun 2004

Posts: 164

Likes: 0

From: yuba city, ca

I checked plug and wire visually. I didnt ohm out the injector or use the stethoscope because I can't get to the injector due to the fact that the intake completely covers it. So I will attempt to get to it tomorrow. What is the light you are referring to?

eddie-