Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > Engine Tech Forum > 4-Cylinder Tech
Forgot Password? Join Us!


Reply
 
LinkBack Thread Tools Search this Thread

  #1  
Old 06-25-2012, 12:14 PM
Learning to use the forums
 
Join Date: Jun 2012
Posts: 2
Default P0301 Code-misfire

What's up guys!..

Ok, so i'm working on my friends 2.5 liter 1999 Ranger, about 3 months ago I replaced the fuel pump and has been working flawlessly, now he calls me up saying there's really rough idle and shaking when driving and hes Engine light is on... I have a code reader and came back as p0301-misfire cylinder 1.

I bought and replaced all (8) spark plugs and wires, NOT the coil packs though. When I took out cylinder 1 spark plugs, I could see and smell fuel on them,the other plugs where normal.

What does the fuel on the spark plug tell you? I'm guessing its a faulty injector that's just stuck open?..not sure.

Also after replacing plugs and wires with no change in roughness, I pulled the wires off the coil packs to just see if there were sparks..cylinders 2,3,4 all had spark coming from coil pack to wire, but cylinder 1 had no spark..on both coil packs. So what is going on here? I switch the coil packs around to see if that makes a difference, nothing.

Why is there spark from the coil pack to plug wires to cylinders 234, but non from 1? Any help would be greatly appreciated..
Reply With Quote
  #2  
Old 06-25-2012, 02:23 PM
Ford Ranger Driver
 
Join Date: Jun 2012
Posts: 1,961
Default

Sounds like ur ignition control module, take it off to get it tested at autozone or oreilys. My stang was doin the same, also swapped the coils but nothin, then got the icm tested and replaced. Their like $120 new or like $40 at junkyards

GO GO POWER RANGER!!!
Reply With Quote
  #3  
Old 06-26-2012, 04:36 PM
Ford Ranger Driver
 
Join Date: Jan 2009
Posts: 5,528
Default Re: P0301 Code-misfire

Quote:
Originally Posted by ziggified View Post
What's up guys!..

Ok, so i'm working on my friends 2.5 liter 1999 Ranger, about 3 months ago I replaced the fuel pump and has been working flawlessly, now he calls me up saying there's really rough idle and shaking when driving and hes Engine light is on... I have a code reader and came back as p0301-misfire cylinder 1.

I bought and replaced all (8) spark plugs and wires, NOT the coil packs though. When I took out cylinder 1 spark plugs, I could see and smell fuel on them,the other plugs where normal.

What does the fuel on the spark plug tell you? I'm guessing its a faulty injector that's just stuck open?..not sure.

Also after replacing plugs and wires with no change in roughness, I pulled the wires off the coil packs to just see if there were sparks..cylinders 2,3,4 all had spark coming from coil pack to wire, but cylinder 1 had no spark..on both coil packs. So what is going on here? I switch the coil packs around to see if that makes a difference, nothing.

Why is there spark from the coil pack to plug wires to cylinders 234, but non from 1? Any help would be greatly appreciated..
Quote:
Originally Posted by tacho19871987 View Post
Sounds like ur ignition control module, take it off to get it tested at autozone or oreilys. My stang was doin the same, also swapped the coils but nothin, then got the icm tested and replaced. Their like $120 new or like $40 at junkyards

GO GO POWER RANGER!!!
his ICM is part of the pcm. it's possible you have a bad pcm....not sure I would look around at the connections.
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 137k. (4.0 engine is out of a 2009 Ranger w/87k)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).

1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
Reply With Quote
  #4  
Old 06-26-2012, 05:24 PM
Ford Ranger Driver
 
Join Date: Jun 2012
Posts: 1,961
Default

Quote:
Originally Posted by modelageek

his ICM is part of the pcm. it's possible you have a bad pcm....not sure I would look around at the connections.

Ur right it doesnt have icm, my bad!

GO GO POWER RANGER!!!
Reply With Quote
  #5  
Old 06-27-2012, 12:37 PM
Learning to use the forums
 
Join Date: Jun 2012
Posts: 2
Default Re: P0301 Code-misfire

Can you get the PCM tested?
Reply With Quote
  #6  
Old 06-28-2012, 07:57 PM
Like the Forums
 
Join Date: Jun 2012
Posts: 30
Default Re: P0301 Code-misfire

a misfire in my supercharged cavalier was driving me nuts, cylinder #2. I checked my vacuum system, fuel system, plugs, ignition module, everything.

turned out i had loose intake manifold bolts and there was an undetectable leak. more than one bolt was loose. make sure all his manifold bolts are nice and tight. might even take them out, use some locktite and put them back in. may not be your issue but its always something simple when you find out what it is that makes you smack ur head lol..
__________________
2003 Mazda B3000, auto, extended cab, dual sport, 2x4
2004 Chevy Cavalier, 2dr, supercharged, 5spd, few other mods

"100,000 sperm and you were the fastest?!"
Reply With Quote
Reply

Tags
misfire, p301, rough idle

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
rough idle and misfire code wgotsch2 3.0 Vulcan Tech 2 06-12-2012 02:03 PM
cylinder # 1 misfire, code 0301 dkarten 4.0 SOHC / 4.0 OHV Tech 0 12-26-2011 01:03 PM
01 3.0 v6 cyl 6 misfire code 01Rangergirl 3.0 Vulcan Tech 1 12-23-2011 10:25 PM
01 3.0 v6 cyl 6 misfire code 01Rangergirl General Ford Ranger Discussion 0 12-23-2011 02:09 PM
Trouble Code P0301 HELP CLOS99 3.0 Vulcan Tech 3 03-04-2011 02:51 PM



Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.