Serious Explorations Ford Explorer and Ranger Message Board
#1 Resource for Ford Explorer and Ranger Owners - By Enthusiasts, for Enthusiasts.


Ford Explorer Generation Guide

EF Swag Store 2015 Ford Explorer Forums Elite Membership Chat Room My Posts Reviews Explorer Photo Gallery
Go Back   Ford Explorer and Ranger Forums "Serious Explorations" > Ford Explorer Ranger Repair - Troubleshooting - Modifications & Detailing Forums > Under the Hood > Explorer, Ranger - Computers, Chips, Tuning > EEC IV

Notices

'94 Ranger EEC-IV codes 157, 158, 181, 186, 189, 543, 556

Reply
 
Thread Tools
Old 04-13-2008, 07:25 PM   #1
WhyteWolf
CT
'94 Ranger XLT, 4.0L V6
 
Join Date: Apr 2008
Posts: 3

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
US '94 Ranger EEC-IV codes 157, 158, 181, 186, 189, 543, 556

This is my first time posting, so bear with me...
I have a '94 Ranger 4.0, and have been having some strange issues. At random times, often when accelerating heavily such as when getting on the highway, the check engine light comes on briefly, then turns off a minute or so later. I drive roughly an hour to work each day, and it usually occurs between 1 and 5 times per trip. I also have noticed a ticking when accelerating under load (i.e. going up hill). I have been putting in 93 octane gas to reduce the ticking, but it isn't going away. I also had problems where it wouldn't always start, which I traced back to the EEC relay which I replaced about a week ago. I had been hoping that replacing that relay would have fixed the other issues as well, but I guess that was just wishful thinking.
So I hooked up my code reader today, and got a bunch of codes off of the continuous memory check, and no cods off of KOEO or KOER. The codes I got were:

157
158
181
186
189
543
556

I have found the definitions for all of these codes, but most of them don't really mean much to me, so I was hoping someone may have some knowledge of problems that could cause one or more of these codes, so I have somewhere to start. Any help would be greatly appreciated!
Thanks.
WhyteWolf is offline   Reply With Quote
( Join the Elite Explorers )

For only $20 per year you can become an Elite Explorer. Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn what modifications really work without having to experiment on your own. Elite Explorer members can change the forum "styles" to see less ads, no green underlined links, and many other benefits such as being able to store 1000 Private Messages, upload photo attachments directly to your posts and more. Join the Elite Explorers today.


Old 04-13-2008, 11:44 PM   #2
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 4,976

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
That is an interesting set of codes. Where you got pass (111) codes from KOEO and KOER, that indicates that whatever the fault is, it is intermittent (or at least not present when you did the tests).

Maybe it's because I see the fuel pump circuit as easiest to test, or because I just had to replace the fuel pump in my Suburban (and got similar lean codes as it went out), but I might start with the CM 556. If the fuel pump circuit has an loose connection in it, then the pump will be cutting out, causing low fuel pressure to the injectors, causing a lean condition and the stumbling you describe. Whatever test you devise, recognize that your code list indicates that the fault is at least somewhat intermittent, so you have to devise the test to account for that. I might start with a "wiggle test" to see if I could find a loose connection in the fuel pump circuit. I might put an ammeter in line with the fuel pump (Opera House used to advocate this kind of test when he used to frequent the board) to see if I could see any indication of the pump circuit going open. A fuel pressure gauge on the fuel rail, especially if you rig it up so you can monitor fuel pressure while driving might also help see what's going on.

The 1st gen 4.0 is known for "pinging" like you are describing (if you are indeed describing spark knock). The usual culprits are either a dirty MAF or a vacuum leak or a leaky intake manifold. The MAF is easy to clean, the lower intake manifold leak can usually be fixed by simply tightening the bolts down to spec, and any other vacuum leak just needs to be found and fixed. Vacuum leaks can easily cause lean codes like you're seeing (though they wouldn't effect the fuel pump circuit). Spark knock gets discussed a lot around here, so a run through the site's search engine would be in order.

Try those two areas to see if those are your problems. If so, great. If not, then report back and we'll see what we can come up with.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 04-17-2008, 09:52 PM   #3
WhyteWolf
CT
'94 Ranger XLT, 4.0L V6
 
Join Date: Apr 2008
Posts: 3

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Thanks for the advice,
I cleaned the MAF today (had to go to the parts store to get a bit to remove it, or else i would have done it days ago...). I have only taken it for a quick spin so far, but i think it may have done the trick. One of the probes on the MAF was pretty nasty.
I should know for sure if it's fixed after i drive to work tomorrow, I'll keep you posted.
Thanks again!
WhyteWolf is offline   Reply With Quote
Old 04-17-2008, 10:21 PM   #4
Tbars4
anaheim hills,california
 
Tbars4's Avatar
95 ranger 4x4/ 91 X 4x4
 
Join Date: Mar 2007
Posts: 24,600

Vehicle Specs

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
...Welcome to the forum...




__________________
I have Rocks in my head. What's in yours?
'95 ranger xl 4x4 2.3L std cab, 2 sticks Ranger RegistryThe Squirrel
'91 4x4=To much to list, much more to add.. Project "X" and more Pics & Mod's List
How to: Wheels,Tires, & Lifts...
Buy Explorerforum.com Items here
Tbars4 is offline   Reply With Quote
Old 04-17-2008, 11:47 PM   #5
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 4,976

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
If you haven't already, I would suggest you clear the CM codes so that if this problem resurfaces (or another one), you'll know that any codes you pull are new and not left over from before cleaning the MAF.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 04-22-2008, 11:38 PM   #6
WhyteWolf
CT
'94 Ranger XLT, 4.0L V6
 
Join Date: Apr 2008
Posts: 3

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Thank for all of the advice (and the welcome), it looks like cleaning the MAF did indeed fix all of my problems...amazing!
I had forgotten to clear the codes, I had cleared them after replacing my EEC relay, but since the CEL came on after that, It needed to be done again. I cleared them out tonight, thanks for the reminder!
WhyteWolf is offline   Reply With Quote
Old 04-22-2008, 11:45 PM   #7
Tbars4
anaheim hills,california
 
Tbars4's Avatar
95 ranger 4x4/ 91 X 4x4
 
Join Date: Mar 2007
Posts: 24,600

Vehicle Specs

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
...you are very welcome and thank you for updating us on your sucessful progress..




__________________
I have Rocks in my head. What's in yours?
'95 ranger xl 4x4 2.3L std cab, 2 sticks Ranger RegistryThe Squirrel
'91 4x4=To much to list, much more to add.. Project "X" and more Pics & Mod's List
How to: Wheels,Tires, & Lifts...
Buy Explorerforum.com Items here
Tbars4 is offline   Reply With Quote
Reply

Suggest this thread to friends:



Join the "Elite Explorers" Today!



Search Explorer Forum


Top of Page

Thread Tools

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

Forum Jump


All times are GMT -5. The time now is 01:42 PM.



US Flag
We Support Our Troops!

Explore the site!


Copyright 2014 - 1996 Rick Horwitz Photography



Ford Motor Company is not involved in the management of this site in any way.



All tips on this site are for use at your own risk and discretion.

Modifying the suspension on any vehicle will cause changes to its handling characteristics.



Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.