Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

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

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 03-01-2011, 02:26 PM
Cujimmy Cujimmy is offline
Learning to use the forums
 
Join Date: Mar 2011
Posts: 2
Default Fuel injector?

Need help. First I am not a mechanic and do not pretend to be. I have a 2000 Ranger 6cyl 4.0L. I am having a problem I believe may be fuel injectors. I have a sputter in the engine especially when going up hill or whenever the engine is working hard. At traffic lights it feels like it wants to stall but has not yet. I bought a data plug in tool, Autoxray, which gives me a code for Check Engine light and it said I have 2 lean cyl and detecting a backfire in cyl 7. I tried the cheapest route first, liquid fuel injector cleaner with no result. Just curious? Am I barking up the wrong tree? If not, can I clean or replace the fuel injectors fairly easily myself? Help!!!!
Thanks
Reply With Quote
  #2  
Old 03-01-2011, 02:39 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: Fuel injector?

Well a few things come to mind here, and none of them have to do with fuel injectors.

#1: Lean conditions are usually caused by vacuum leaks. Usual spot is right behind the top of the engine.

#2: I find it hard to believe you have a backfire in Cylinder #7 since you only have 6 cylinders.

#3: Misfires and stuttering under heavy load is usually a symptom of a clogged fuel filter, or bad spark plugs.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #3  
Old 03-01-2011, 02:47 PM
Cujimmy Cujimmy is offline
Learning to use the forums
 
Join Date: Mar 2011
Posts: 2
Default Re: Fuel injector?

Fire,
Thanks much. I might just try replacing the spark plugs, sorry about being a numbskull with the cyl 7. LOL When you say right behind the engine, what do you mean? Also, a friend mentioned vacuum too but not sure what you meant?
Reply With Quote
  #4  
Old 03-01-2011, 04:55 PM
Botta Ranger Botta Ranger is offline
Ford Tough
 
Join Date: Jan 2011
Posts: 240
Default Re: Fuel injector?

Any air that enters the engine should only come through the throttle body (or carb on old stuff). That's the only way the engine can keep track of how much fuel to mix with it. A vacuum hose off, a leaking intake gasket or other leak allows excess air in and results in too lean a mix. Backfiring is a common symptom. Can cause serious overheating problems. Fix promptly.
Reply With Quote
  #5  
Old 03-01-2011, 07:58 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: Fuel injector?

Read this. All about the common vacuum problem.

http://www.fordrangerforum.com/4-0-s...look-here.html
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #6  
Old 03-20-2016, 06:29 AM
don9084 don9084 is offline
Learning to use the forums
 
Join Date: Sep 2014
Posts: 7
Default Re: Fuel injector?

My 2000 ranger 4.0l kept getting a P0174 and P0171 lean condition and eventually a P0303 misfire in cylinder #3. When I replaced the #3 spark plug, the issues went away for several thousand miles, then back. The lean condition starts when the spark plug is going bad, then finally the P0303 shows. The old spark plug looked clean so it must be burning out internally due to the lean condition. Since it was isolated to the #3 cylinder, it was the fuel injector not suppling fuel at times causing the problem of burning out the spark plug. A vacumn leak at the intake would cause more than one cylinder to misfire so I eliminated this idea.
Reply With Quote
  #7  
Old 04-01-2016, 10:08 PM
emtjcjr emtjcjr is offline
Liking the Ford Ranger Forum
 
Join Date: Jun 2012
Posts: 23
Default

Quote:
Originally Posted by don9084 View Post
My 2000 ranger 4.0l kept getting a P0174 and P0171 lean condition and eventually a P0303 misfire in cylinder #3. When I replaced the #3 spark plug, the issues went away for several thousand miles, then back. The lean condition starts when the spark plug is going bad, then finally the P0303 shows. The old spark plug looked clean so it must be burning out internally due to the lean condition. Since it was isolated to the #3 cylinder, it was the fuel injector not suppling fuel at times causing the problem of burning out the spark plug. A vacumn leak at the intake would cause more than one cylinder to misfire so I eliminated this idea.

A bad MAF sensor can trip misfire codes. MAF went bad in my 06 & tripped those exact codes. It's not a cheap sensor either.
__________________
06' 4.0 4x4 Sport
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Starting Delay (Fuel Injector or Fuel Pump??) devster 3.0 Vulcan Tech 22 03-04-2011 04:33 PM
Bad fuel injector dbb2300 4-Cylinder Tech 0 09-01-2010 08:58 PM
injector size question Rob 3.0 Vulcan Tech 2 03-03-2010 09:39 PM
2000 2.5l fuel injector lildevjkoch1977 4-Cylinder Tech 2 02-25-2010 10:15 AM
What size injector is the best for a built 4.0L? Sasquatch 4.0 SOHC / 4.0 OHV Tech 11 02-22-2010 05:13 PM