NAS 110 Condenser - Defender Source
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  #1  
Old March 7th, 2014, 05:26 PM
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Matthias Moran
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NAS 110 Condenser

My 110 has always had a condenser (the little capacitor thing connected to one side of the ignition coil not the a/c condenser) but I can't find any mention of it in the service manual or wiring diagrams and I don't know that this type of ignition usually has one.

Can anyone else let me know if their 3.9 engine has one ?
What side of the coil is it connected to ?

I'm trying to debug an intermittent failure to produce spark problem. Could be something making my ignition coil keep going bad.

Thanks
- Mat
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  #2  
Old March 7th, 2014, 05:31 PM
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It's a ignition coil supressor, ADU7242L
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  #3  
Old March 7th, 2014, 05:32 PM
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Search "dwell" angle for a possible answer.
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Old March 7th, 2014, 05:46 PM
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Quote:
Originally Posted by Z.G View Post
It's a ignition coil supressor, ADU7242L
Not the same thing as this ?
http://www.roverparts.com/Parts/RTC3472.cfm

And do you know which side of the coil it's meant to connect to + or - ?
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Old March 7th, 2014, 06:01 PM
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Quote:
Originally Posted by mattm View Post
Not the same thing as this ?
http://www.roverparts.com/Parts/RTC3472.cfm

And do you know which side of the coil it's meant to connect to + or - ?
Depends... do you have a carburetor on your engine?
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Old March 7th, 2014, 06:05 PM
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Paging Josh. The ignition expert
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Old March 7th, 2014, 06:58 PM
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Quote:
Originally Posted by Z.G View Post
Depends... do you have a carburetor on your engine?
Should I install one ?

I guess RTC3472 won't help me. Not sure why AB is selling this for a NAS 110. Maybe I'll tell them. So now I need to order ADU7242L which won't be here until next week some time depending on how much I'm prepared to pay for shipping. Meanwhile my 110 is "resting in the garage"

I still need to know which side of the coil. A complete wiring diagram for this area would be nice then I could also make sure that everything else is the right way round. No useful information about this in the service manual of course.

I do have the ignition module relocation kit and will replace the module when I install my next new coil. Also planning to check the air gap in case it has magically changed.

Also planning to sacrifice a goat. That might help.
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  #8  
Old March 7th, 2014, 07:04 PM
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Can you check voltage into the coil then out? Work out from there. Do ignition module test, etc.
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  #9  
Old March 7th, 2014, 07:08 PM
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The piece I told you(the ADU number) really doesn't do much. Do you have feedback on your speakers when your engine revs? If yes, that suppressor is probably bad, but it's not causing your problems.
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Old March 7th, 2014, 07:09 PM
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I'm thinking the goat sacrifice may fix it
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  #11  
Old March 7th, 2014, 07:21 PM
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If ADU7242L isn't very important then I'll try without it first. I vaguely thought that if it was shorting out then that could be bad so I'll just remove it until I have time to get a new one.

Hopefully I'll have something to report in a couple of days (other than the demise of the goat.)
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  #12  
Old March 7th, 2014, 07:22 PM
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Quote:
Originally Posted by mattm View Post
If ADU7242L isn't very important then I'll try without it first. I vaguely thought that if it was shorting out then that could be bad so I'll just remove it until I have time to get a new one.

Hopefully I'll have something to report in a couple of days (other than the demise of the goat.)
Well here it is in case you decide to get it, but I really doubt that it'll be your issue.

http://www.roversnorth.com/ProductDe....9L-V-8&key=it
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Old March 7th, 2014, 08:00 PM
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Matt are you thinking of the little chicklet maybe?
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  #14  
Old March 7th, 2014, 08:50 PM
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Quote:
Originally Posted by Uncle Douglas View Post
I'm thinking the goat sacrifice may fix it
Oh stop it. The 14CUX only requires chicken sacrifice.

Serious, where is the ignition module? If on the dizzy, get the kit and relocate it with a new module. There are a ton of threads and it is usually something easy enough, it is just hard to figure out what (like when a starter wire was intermittently shorting and kept killing my ignition modules).
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  #15  
Old March 29th, 2014, 01:23 PM
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Just to close the loop on this one...
The problem eventually turned out to be that the new distributor rotor that I had recently installed was intermittently shorting out. Apparently a fairly common problem with some of the aftermarket rotors.
I also had a sticking centrifugal advance mechanism and a leaky diaphragm in the vacuum advance both of which caused random timing fluctuations.
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