Electronic Fuel Injection Control Unit - Defender Source
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  #1  
Old August 28th, 2013, 02:09 PM
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Thomas Davey
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Electronic Fuel Injection Control Unit

Anyone have a ERR4943 (14CUX) ECU/ECM for sale. I'm needing to pick one up for my 1994 Defender 90 (NAS) 3.9 liter.
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  #2  
Old August 28th, 2013, 02:20 PM
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http://www.landroverpartscheap.com/O...E/ERR4943.html

These seem to have a new price around $4500!!

just find one from a D1 or a RR classic from a breakers
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Old August 28th, 2013, 08:15 PM
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hint if you get one out of a RRC you won't have the 85mph fuel cut . Try RoverDude - John Gadd as he usually has a few extras around.
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Old August 28th, 2013, 09:37 PM
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Originally Posted by CDeWan View Post
hint if you get one out of a RRC you won't have the 85mph fuel cut . Try RoverDude - John Gadd as he usually has a few extras around.
Yeah because you regularly want to hit 85 plus is a defender.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #5  
Old August 28th, 2013, 10:00 PM
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Yeah because you regularly want to hit 85 plus is a defender.
Wuss.
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Old August 28th, 2013, 11:42 PM
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Talking Wussx2

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Wuss.
My thoughts exactly. They still handle well at 85+ even without swaybars. It's not that you have to but someday you may need to when the zombies come.
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Old August 29th, 2013, 12:05 AM
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Yeah because you regularly want to hit 85 plus is a defender.
Hell Yeah! Down hill, down wind with a tail wind!!!!!
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Old August 29th, 2013, 11:01 AM
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Thomas Davey
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Does transmission option matter when searching for an ECU out of a D1 or RRC?
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Old August 29th, 2013, 11:25 AM
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Originally Posted by tomdavey_III View Post
Does transmission option matter when searching for an ECU out of a D1 or RRC?
No, they all work fine in my experience. The one thing you will run into is the outer case does not have tabs to mount to the bulkhead on a 93/94 if you get it out of a disco or RRC but you can swap your old case over.
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Old August 29th, 2013, 12:31 PM
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2x

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Originally Posted by evilfij View Post
No, they all work fine in my experience. The one thing you will run into is the outer case does not have tabs to mount to the bulkhead on a 93/94 if you get it out of a disco or RRC but you can swap your old case over.
If you have air conditioning it will sit in place pretty nicely above the air conditioning housing on the pass. side. I was able to drill the mounting tab to at least get one nut on.

The more important point I was trying to make in getting an ECU out of RRC or D1 is that you are not limited to solely searching for a 14CUX out of a Defender as you have the option to pick it out of a larger population of vehicles.

And yes down hill with a tail wind with your mirrors tucked in and a bean burrito to provide you a nice nitrous shot should get you over the 85 mph hump.
No they will do 85 on a straight away no problem with the 3.9. It is nice to know you have the ability to pass a slow moving truck. Uphill is another story
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  #11  
Old August 29th, 2013, 03:00 PM
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One last question I hope, and thank you for all the help... Does the "AMR####" number matter on the 14CUX ECU that I am looking for?
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  #12  
Old August 29th, 2013, 03:04 PM
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One last question I hope, and thank you for all the help... Does the "AMR####" number matter on the 14CUX ECU that I am looking for?
Not in any material sense.

4.2 and 3.9 both work fine. A cold start prom would be better I suppose, but who really cares.
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Old August 29th, 2013, 03:47 PM
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Brains

Ron,
Do not all 14CUX come with a cold start prom? and not would you happen to know the different part numbers that do carry it - I may make you resort to the vault of microfische stashed in the basement
Clay

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Originally Posted by evilfij View Post
Not in any material sense.

4.2 and 3.9 both work fine. A cold start prom would be better I suppose, but who really cares.
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  #14  
Old August 29th, 2013, 03:56 PM
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Originally Posted by CDeWan View Post
Ron,
Do not all 14CUX come with a cold start prom? and not would you happen to know the different part numbers that do carry it - I may make you resort to the vault of microfische stashed in the basement
Clay
There have been so many updated PROMs I could not tell you and i dont have a list. (Maybe part of operation pride but i am not sure where those docs are). The last PROMs were the same for 4.2 and 3.9 (believe it or not) Although those were sold years after. Usually there will be a sticker on the outside of the ECU showing it was updated with cold start (my 94 had one). I have never had an issue on 14CUX with cold start and I have probably run a dozen different ECUs over the years. Only on GEMS have I had an issue.
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  #15  
Old August 29th, 2013, 05:32 PM
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I've posted the 14cux PDF loads of times. The various tunes are listed in the back.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #16  
Old August 29th, 2013, 07:53 PM
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I have a 14cux for a 3.9 in the bottom drawer of one of my tool chests. If there's interest I'll dig it out and post the part no. Just been keeping it as a trouble shooting spare but that need hasn't materialized.
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  #17  
Old August 29th, 2013, 08:02 PM
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I have many of them for sale. And I am local to you.

Do you run the Ty's diner ?
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  #18  
Old August 29th, 2013, 09:05 PM
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Sorry no clue. What is the stock ECU for a 1994 Defender 90 (NAS) 3.9 liter? So replacing it with a 14cux will improve your driving up to 85 mph?
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Old August 29th, 2013, 09:43 PM
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attached document lists all the 14CUX tunes - it also has diagnostics .... for those that don't believe in witchcraft and voodoo as valid troubleshooting techniques.

the 85mph is a speed limiter that prevents a defender going over 85mph funnily enough.
Attached Files
File Type: pdf 1314CU_14CUX_Systems.pdf (577.0 KB, 241 views)
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #20  
Old August 29th, 2013, 10:40 PM
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attached document lists all the 14CUX tunes - it also has diagnostics .... for those that don't believe in witchcraft and voodoo as valid troubleshooting techniques.

the 85mph is a speed limiter that prevents a defender going over 85mph funnily enough.
Speed limiter is 89 I thought.
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