4.0 engine in an 03 disco

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Sep 25, 2018 | 12:01 PM

#21

Nosugar0carbs

Rock Crawling

Joined: Sep 2018

Posts: 288

Likes: 57

From: Southern Florida

I threw in a 2000 disco ecu bosch 4.0 into my 4.6 bosch, she starts for maybe a second or two nothing more. Seems to shut the fuel off as it does keep producing a spark if I keep spinning the engine over.

Sep 25, 2018 | 02:22 PM

#22

2Guinness

Three Wheeling

Joined: Jul 2015

Posts: 50

Likes: 5

From: Page Arizona

Donor motor will be here Friday. I am thinking of at least swapping out the heads with the 4.6 (SAI) ones I have that appear to be in very good condition. I am wondering if changing the Cam to the 4.6 one is in order?

Sep 25, 2018 | 04:19 PM

#23

Charlie_V

Camel Trophy

Joined: Nov 2012

Posts: 3,717

Likes: 248

From: Longview, Texas

Quote:

Originally Posted by Nosugar0carbs

That's strange. I drove mine around with a 4.6 swapped in and didn't change anything electronic.

Sep 25, 2018 | 07:25 PM

#24

Nosugar0carbs

Rock Crawling

Joined: Sep 2018

Posts: 288

Likes: 57

From: Southern Florida

Quote:

Originally Posted by Charlie_V

That's strange. I drove mine around with a 4.6 swapped in and didn't change anything electronic.

Both vehicles run and drive, i did the immobilized trick to both cars before pulling anything, put the 4.0 ecu into the 4.6 donor car (only ecu), cranks and fires up for 1-2 seconds and nothing else until the key is cycled. Going to rebuild the 4.0 engine after I get this sorted out, my 4.6 at the moment has a noticeable tack from the lower end.... typical LR

Sep 27, 2018 | 09:23 PM

#25

Charlie_V

Camel Trophy

Joined: Nov 2012

Posts: 3,717

Likes: 248

From: Longview, Texas

Quote:

Originally Posted by Nosugar0carbs

Hmm. I have never had to replace any electronics. But I have a complete extra set. Some years ago a forum member who owns a shop needed a set so I mailed them; he sent them back. I've always assumed they were a matched set and the BCU and ECU had to be swapped together.

I know my input on this thread is opposite of what you need to know because you are going the other direction than I went, presumably because the 4.0 is generally accepted to be more reliable. But I did not mess with the immobilizer or swap any electronics at all. And I swapped back to the 4.0. I think your original stuff is good (with the small exception of an ECU that expects ridiculous SAI components).

My original truck is non SAI. The 4.6 I rebuilt and destroyed was from an SAI truck. I just plugged the SAI holes with chopped and filled SAI lines....