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  #21  
Old April 27th, 2016, 10:08 AM
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So the engine never runs warm?
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  #22  
Old April 27th, 2016, 10:18 AM
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So the engine never runs warm?
The engine is not running hot. The coolant issue I had was a hole in the pressure tank. It was defective. I thought since it was spraying coolant it was overheating. Turns out that was a completely separate issue.

The issue is detonation. We're 99% sure it's a wiring issue.

Has anyone here successfully installed a 4.6 motor?
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  #23  
Old April 27th, 2016, 01:48 PM
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Chris Snyder
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Have you tried what Jimmy suggested? With a GEMS truck you should have 4 O2 sensors. 2 in front of the catalytic convertors and 2 behind. If you managed to reverse the wiring to the ECU for front/back somehow you'd definitely have some weird issues. And would be consistent with switching to closed loop.
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  #24  
Old April 27th, 2016, 02:44 PM
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2nd on jimmy's suggestion - you probably have at least 1 set of o2 sensors mixed up - quite probably both sets.
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  #25  
Old April 27th, 2016, 03:04 PM
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I was thinking left to right because the connectors are right next to each other on top of the bell housing from what I remember.


Who diagnosed it as being detonation?
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  #26  
Old April 27th, 2016, 04:20 PM
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Who diagnosed it as being detonation?
My mechanic and over the phone with Cannibal.

I think we're down to it's either O2 sensor issues or Cannibal sent me an engine with such compression it won't run on pump gas. We delve back in in the morning.
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  #27  
Old April 27th, 2016, 04:40 PM
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Quote:
Originally Posted by jason1st View Post
My mechanic and over the phone with Cannibal.

I think we're down to it's either O2 sensor issues or Cannibal sent me an engine with such compression it won't run on pump gas. We delve back in in the morning.


I personally would not trust Cannibal, quite a few have had bad experiences with them.


Do you know what pistons they used? I know a bunch of people running 4.0 pistons on a 4.6 crank and rods that gives higher compression. I have aftermarket high compression pistons in my 4.6 (of unknown origin). For reference, I recently did a compression test on my truck recently and got around 225 psi per cylinder.
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  #28  
Old April 27th, 2016, 05:01 PM
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Quote:
Originally Posted by Jymmiejamz View Post
I personally would not trust Cannibal, quite a few have had bad experiences with them.


Do you know what pistons they used? I know a bunch of people running 4.0 pistons on a 4.6 crank and rods that gives higher compression. I have aftermarket high compression pistons in my 4.6 (of unknown origin). For reference, I recently did a compression test on my truck recently and got around 225 psi per cylinder.
I don't know what pistons they used. But I'm pretty committed to Cannibal at this point. The engine is in the truck and running. I hope I don't have to do major surgery again.
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  #29  
Old April 27th, 2016, 08:13 PM
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Good reading here on what your trying to do.

http://www.defendersource.com/forum/...d90s-8820.html

What did GEMS harness come from?
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  #30  
Old April 28th, 2016, 07:21 AM
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Originally Posted by hoxie173 View Post
Good reading here on what your trying to do.

http://www.defendersource.com/forum/...d90s-8820.html

What did GEMS harness come from?
Gems harness came off another truck and some guy at the shop wired it all up
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  #31  
Old April 28th, 2016, 07:34 AM
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Was the harness from a Gems defender, range or discovery? What's transmission are you using?
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  #32  
Old April 28th, 2016, 07:49 AM
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Quote:
Originally Posted by jason1st View Post
Gems harness came off another truck and some guy at the shop wired it all up


Sounds like they must have wired something relating to the O2 sensors wrong. I would check power and ground at the O2 sensors along with checking that they are plugged into the correct spots. The easiest way to check that they are plugged in correctly is to look at the live data with a diagnostic computer and plug each sensor one at a time. Make sure the signal that drops out corresponds with the correct location on the diagnostic computer.
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  #33  
Old April 28th, 2016, 08:07 AM
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Originally Posted by hoxie173 View Post
Was the harness from a Gems defender, range or discovery? What's transmission are you using?
I believe the harness came form a Discovery.

I'm using an R380 Manual transmission

------ Follow up post added April 28th, 2016 08:09 AM ------

Quote:
Originally Posted by hoxie173 View Post
Good reading here on what your trying to do.

http://www.defendersource.com/forum/...d90s-8820.html

What did GEMS harness come from?
I read this thread as well as the "update" thread and it seems to me that after 10 years there's still nothing available to truly make a 4.6 swap make any sense at all.

Is anyone here running a 4.6 without issues?
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  #34  
Old April 28th, 2016, 08:58 AM
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Quote:
Originally Posted by Jymmiejamz View Post
Sounds like they must have wired something relating to the O2 sensors wrong. I would check power and ground at the O2 sensors along with checking that they are plugged into the correct spots. The easiest way to check that they are plugged in correctly is to look at the live data with a diagnostic computer and plug each sensor one at a time. Make sure the signal that drops out corresponds with the correct location on the diagnostic computer.
Agreed. Good idea to check your o2's are in the correct positions with live data.

Plenty of people have done 4.6 conversions with success but either gems or 14cux you need to deal with the overall less timing that a 4.6 needs. Davis has posted on this and solved my 14cux 4.6 detonation issues. Your trying to run a gems 4.6 5spd which LR never offered so there is no prom available. You could plug in a RR 4.6 prom chip but it would have constant trans codes because it's looking for a automatic. Mark Adams may be able to help you.

Is it knocking only under load or constantly? What does have for fault codes?
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  #35  
Old April 28th, 2016, 09:51 AM
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Originally Posted by hoxie173 View Post
Is it knocking only under load or constantly? What does have for fault codes?
It only knocks under load.

We're working on getting more fault codes today.

Am I better off yanking all these electronics and slapping a carburetor on it?
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  #36  
Old April 28th, 2016, 09:56 AM
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I'd change the front cover, cam and go 14cux before I went with a carb.
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  #37  
Old April 28th, 2016, 10:11 AM
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Quote:
Originally Posted by jason1st View Post

I read this thread as well as the "update" thread and it seems to me that after 10 years there's still nothing available to truly make a 4.6 swap make any sense at all.

Is anyone here running a 4.6 without issues?

A bunch of people (including me) are running 4.6 V8's in their Defenders, there is nothing special about it. Sounds to me like the issue is your shops inability to diagnose it.

Quote:
Originally Posted by jason1st View Post
Am I better off yanking all these electronics and slapping a carburetor on it?

No.
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  #38  
Old April 28th, 2016, 10:16 AM
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Originally Posted by Jymmiejamz View Post
A bunch of people (including me) are running 4.6 V8's in their Defenders, there is nothing special about it.
There are a lot of threads on Defendersource that say otherwise. I haven't found a single post from someone who actually has a 4.6 that doesn't have issues. Even ECR has about a zillion posts here trying to work the bugs out.
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  #39  
Old April 28th, 2016, 10:18 AM
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Then put the 3.5 with a carb back in it.

------ Follow up post added April 28th, 2016 10:27 AM ------

People have been putting 4.6s in GEMS trucks since before I could drive. The fuel injection ECU doesn't know that its in a Defender, so that makes no difference. You could get a GEMS 4.6 from the factory in a P38 Range Rover.


Can Cannibal tell you what the compression ratio is in your motor?
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  #40  
Old April 28th, 2016, 10:38 AM
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my GEMS r380 disco has a 4.6 with 4.0 pistons and is completely driveable. Itll ping if I really lug it, but it will also annihilate the tires if I dump the clutch. Something is wired or assembled wrong in your setup

did the shop hook up the abs input to the ecu?
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