Engine hesitates a lot...? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-27-2006
99ranger4x4's Avatar
RF Veteran
Thread Starter
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
Engine hesitates a lot...?

i tried searching "rough running" didnt get anything, so heres my problem...

my truck at IDLE has a sound like its missing.. i think im not even 85% sure what a miss sounds like.. but w/e its weird
it hasnt popped a code yet, and it was used to idle the same before i changed the spark plugs, i dont remember if it did it when it was under load...

then when i punch it between 2 and 4g the engine seems to almost miss? it has like a "puff" noise and i can feel it no pulling during that time frame... its annoying and any tips would b nice, im gonna test my fuel pressure and compression today...

could it be the injectors? or coil?
i want to pull the injectors but looking at the Haynes manual it seems like its not an easy task...

Thanks
-Matt
Reply With Quote
  #2  
Old 10-27-2006
lifted97ranger's Avatar
Member
 
Join Date: Nov 2005
Location: Charlestown, IN
Posts: 1
search for "IAC" or "Idle Air Control".............it is a problem on the ranger 4.0's.......there is a thread in the How To section that explains how to fix it also.....

could also be a vacuum hose lose.....

or a bad spark plug or bad wires...........

that is the most common 3 things that prolly could be wrong with it i believe....
Reply With Quote
  #3  
Old 10-27-2006
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
when did you replace your fuel filter last?

and like maurice said, check wires, plugs, vacuum hoses FIRST!
Reply With Quote
  #4  
Old 10-27-2006
lifted97ranger's Avatar
Member
 
Join Date: Nov 2005
Location: Charlestown, IN
Posts: 1
there is a check method for the IAC.....do a search for it and see if you can find it....i believe you unplug the IAC, start the truck, and if it wont run or idle, then it IS NOT the IAC..................if it idles rough, then the IAC is bad....
Reply With Quote
  #5  
Old 10-27-2006
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
the IAC wouldnt effect the driving conditions period. it just controls the idle. its something else.

my IAC was hosed, it wouldnt idle, kept dieing, but ran fine while driving.
Reply With Quote
  #6  
Old 10-27-2006
99ranger4x4's Avatar
RF Veteran
Thread Starter
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
well the problem is more pronounced when i punch it, u can only really notice it at idle if ur atcually listening for it..

the spark plugs have probably 3-400 miles on them and the fuel filter has about 2-300 im guessing
Reply With Quote
  #7  
Old 10-27-2006
lifted97ranger's Avatar
Member
 
Join Date: Nov 2005
Location: Charlestown, IN
Posts: 1
what kind of spark plugs did you put in it? if you put anything but Motorcraft, then that is prolly your problem.......if they are Motorcraft, did you replace your wires also? if not they may be bad; spray a mist of water over them at night with the truck running and if it looks like a lightning storm, then they need to be replaced.......another thing to check is all your vacuum hoses....you may have one off somewere...
Reply With Quote
  #8  
Old 10-27-2006
rolsmojave3's Avatar
Level III Supporter
 
Join Date: Jun 2006
Location: Wisconsin
Posts: 2,852
I have a miss at idle also. Unplug your MAF and see if it goes away
Reply With Quote
  #9  
Old 10-27-2006
CAW's Avatar
CAW CAW is offline
Member
 
Join Date: Apr 2005
Location: southern indiana
Posts: 137
I'm not sure if this is your problem but you might take a look at this.

https://www.ranger-forums.com/forum2...ad.php?t=27084

I made the how to after i changed some gaskets. It might give you some ideas. At least it has some pics of the top of the engine taken apart if that helps with any repairs.
Reply With Quote
  #10  
Old 11-01-2006
99ranger4x4's Avatar
RF Veteran
Thread Starter
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
Quote:
Originally Posted by lifted97ranger
what kind of spark plugs did you put in it? if you put anything but Motorcraft, then that is prolly your problem.......if they are Motorcraft, did you replace your wires also? if not they may be bad; spray a mist of water over them at night with the truck running and if it looks like a lightning storm, then they need to be replaced.......another thing to check is all your vacuum hoses....you may have one off somewere...

didnt stock motorcraft, i have autolite in there right now

ill do the water test friday or something, probably need new wires wether its the current problem or not
Reply With Quote
  #11  
Old 11-13-2006
99ranger4x4's Avatar
RF Veteran
Thread Starter
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
problem solved..
swapped the plug wires last night.. thx for any help
Reply With Quote
  #12  
Old 11-13-2006
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
I'm glad it was something easy for you. Those kinds of rough running issues can be difficult to figure out sometimes.

And btw, Plugs other than motorcraft will work. They may not be the same quality. They could be worse or better. But as long as the plug manufacturer specs a particular plug for a particular year motor it will work.

Rich
Reply With Quote
  #13  
Old 11-13-2006
99ranger4x4's Avatar
RF Veteran
Thread Starter
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
the autozone i went to didnt stock the motorcraft plugs for my truck so i got some autolite plats. pulled them all last night and checked the gap and put a metric f' load of anti sieze on them..


ah, im so glad its fixed... the sputtering and **** was getting REALLY annoying
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
3.0 hesitates to start. lownslow95 2.9L & 3.0L V6 Tech 5 03-25-2010 07:13 AM
'99 4.0 here. Hesitates during accel from 55-70mph ramrezz425 General Technical & Electrical 0 01-16-2009 02:02 AM
Engine Hesitates what can I do? JaxRanger 2.9L & 3.0L V6 Tech 4 02-08-2008 08:14 PM
need help truck hesitates psylo535 2.9L & 3.0L V6 Tech 10 03-13-2007 09:10 AM
2.5L Ranger hesitates upon start moenko SOHC - 2.3L & 2.5L Lima Engines 6 08-08-2006 08:13 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 07:02 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.