03 4.0sohc won't idle right. - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-12-2015
Member
Thread Starter
 
Join Date: May 2015
Location: bluefield va
Posts: 3
Icon4 03 4.0sohc won't idle right.

My 2003 ford ranger won't idle steady it goes from 1200 to500rpms, it has new plugs wires fuel filter, both upstream oxygen sensors, new vacuum elbow, idle air control, and air filter Hook it up to the computer and it says bank1sensor1 lean and bank2sensor1 rich and both oxygen sensors are 2days old, and I reset the computer after I put them on and the codes come back, that's the only codes it shows, any help is very much appreciated thanks in advance!
Reply With Quote
  #2  
Old 05-13-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,609
How does the engine run at speed?

Reads like a blocked exhaust(cat) on 1 side.
Since they are new remove/pull out one O2 sensor, try driver's side first, then start engine, yes it will be loud, lol, but see if engine smooths out, if not put that one back in and pull out the other side, same test.

If that doesn't help then you will need to do a compression test.
Another member here with 4.0l SOHC had an issue with Cam Gear slipping causing low compression on 1 bank
Reply With Quote
  #3  
Old 05-13-2015
Member
Thread Starter
 
Join Date: May 2015
Location: bluefield va
Posts: 3
Will do, thanks for the reply. I'll try to do it tomorrow. When I'm going I can put the gas to the floor and like 3 seconds it goes same speed like I was then all the sudden it will throw me back in the seat and just take off.
Reply With Quote
  #4  
Old 05-15-2015
seed60's Avatar
RF Veteran
iTrader: (15)
 
Join Date: Jun 2008
Location: Mooresville, NC
Posts: 5,584
I'm having a very similar problem. Surging idle and delayed throttle response with codes P2196 and P2198. I'm in the process of replacing/cleaning all the stuff that you listed. I'll try that exhaust trick and let you know what happened.
Reply With Quote
  #5  
Old 05-15-2015
Member
Thread Starter
 
Join Date: May 2015
Location: bluefield va
Posts: 3
Let me know if it works for yours, I haven't had time to do it with work.. If it helps yours let me know and I'll know its my converter, but my truck only has one converter so idk if taking out both upstream sensors will make any difference for me or not? But let me know what happens with yours and good luck!
Reply With Quote
  #6  
Old 05-20-2015
Member
 
Join Date: Nov 2014
Location: Niagara, ON
Posts: 44
P2196 and 2198 indicate an issue with your forward (Upstream) oxygen sensors (stuck rich), or possibly the circuit(s) they're connected to. What do your fuel trims read as?
How's your grounding/charging system?
Reply With Quote
  #7  
Old 05-20-2015
seed60's Avatar
RF Veteran
iTrader: (15)
 
Join Date: Jun 2008
Location: Mooresville, NC
Posts: 5,584
Quote:
Originally Posted by 01b3000ds View Post
P2196 and 2198 indicate an issue with your forward (Upstream) oxygen sensors (stuck rich), or possibly the circuit(s) they're connected to. What do your fuel trims read as?
How's your grounding/charging system?
How would you check the fuel trim? Grounding/charging system? The battery and alternator seem to be working fine.

So far I have cleaned all senors/sensor connections and put in new plugs/wires. I have not checked the exhaust yet.
Reply With Quote
  #8  
Old 05-20-2015
Member
 
Join Date: Nov 2014
Location: Niagara, ON
Posts: 44
Whatever scantool you use to read the codes should have a fuel trim display. LTFT/STFT trims...unless all you have is a code reader.

Those codes indicate sensors are seeing more oxygen than they think they should, so it'll instruct the injectors to deliver more fuel...until it over delivers, and then it'll be seeing not enough oxygen, so it'll shorten the injector delivery times, adjust IAC valve based on TPS numbers...on and on until the sensors balance themselves out. if they're stuck at one end of the range they're supposed to be within, it'll never happen. Your task is to determine why they're "stuck" and reporting to the ECU what they are.

HOWEVER - it might not be those sensors reporting incorrectly.
What if you have an exhaust leak, so that outside air is getting in to be seen by the sensors, with more oxygen from fresh air than they're supposed to be seeing? that could cause more o2 around those sensors than the computer thinks it should see as well, causing all of the same things I described above...

I still bet that it's wiring. a broken/burned wire to one of the 3 sensors, a funky ground... Got a wiring diagram?

at least you know the computer works properly I believe Ford tells you to replace the o2 sensors every 60k miles. I don't think they're clean-able, like the MAF.
Reply With Quote
  #9  
Old 06-26-2015
seed60's Avatar
RF Veteran
iTrader: (15)
 
Join Date: Jun 2008
Location: Mooresville, NC
Posts: 5,584
New mass air flow fixed mine.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
tremec tko to a 4.0SOHC duffman84 Drivetrain Tech 0 02-26-2008 07:31 AM
anyone change heads/cams in 4.0sohc Urandaman 4.0L OHV & SOHC V6 Tech 20 10-11-2007 12:05 AM
Who's got 33's with 4.10 gears powered by a 4.0sohc? 95offroadx 4.0L OHV & SOHC V6 Tech 17 09-21-2007 05:05 PM
Need help with buying a 4.0SOHC ATTN:Motor Heads!! l2en 4.0L OHV & SOHC V6 Tech 41 03-11-2007 10:10 PM
Whipple vs 4.0SOHC Muddy02Edge 2.9L & 3.0L V6 Tech 16 09-08-2005 02:26 PM


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 05:23 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.