Really weird no start/ no spark - Defender Source
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  #1  
Old October 22nd, 2014, 10:00 AM
mattwhite
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Matt White
94 D-90
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Location: Fort Collins, CO
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Really weird no start/ no spark

So about a month ago I was starting to have trouble firing up the d-90. I checked the spark and found it was not getting spark to the distributor. I also noticed that the problem only occurred during cool mornings. If I tried to start it later in the morning when the sun had been on the rover for a bit, it would fire right up. So I ordered a new coil, but while I was waiting for it to come in, I found that on cool mornings if I rubbed my hand together and then cupped the coil for 30 seconds, the rover would then fire right up.

I got the new coil on and the problem went away until this morning. No spark to the distributor. I did the same thing, I warmed up my hands and cupped the coil for 30sec and it started no problem.

What gives? Did the new coil go bad, is it something upstream from the coil making them go bad, or is my rover possessed by a spirit that is longing to be held by semi-warm hands?

Background:
'94 D-90
Distributor Cap - New
Coil - New
Plug Wires - Newish/ Good Condition
Alternator - Newish
Starter - Newish
Ignition amp relocation kit installed
Battery - Maybe could use a new one soon, but fine for now
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  #2  
Old October 22nd, 2014, 10:14 AM
Roverlab
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Trevor Griffiths
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Can you check for voltages at the coil when the no start event occurs?
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  #3  
Old October 22nd, 2014, 10:25 AM
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Davis
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Chris Davis
94 NAS D90 6.2LS
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I had a similar instance and it turned out to be the ignition switch. I am guessing the magic "spirit fingers" isn't the fix... It is even possible to have power to the coil in the accessory position and have it go away (from the ignition switch) when you try and start it but you can check that out with a voltmeter. Typically this progresses from hard to start to randomly stalling...

Coils don't typically fail due to slightly cold...
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  #4  
Old October 22nd, 2014, 10:33 AM
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sonoronos
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Ed
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Short of a miracle, the only thing I can think of that touching the coil is doing is grounding it.
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  #5  
Old October 22nd, 2014, 10:49 AM
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down_shift
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Russell
94' D90 ST & 06' LR3
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Cold = condensation = possible tracking if your dizzy cap it bad (finite cracks that you can not see, old plug wires (they can burn up/back at the terminations inside the caps), etc. Try spraying those areas and the coil connections down with CRC 5-56, including under the dizzy cap.
Have you tried starting when viewing the engine when it is pitch black outside? If it looks like an mini electrical storm, start working at the brightest spot!
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Old October 22nd, 2014, 10:51 AM
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Craig
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check the voltage at coil - then at ignition switch....probably the ignition.
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  #7  
Old October 22nd, 2014, 10:55 AM
mattwhite
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Matt White
94 D-90
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Location: Fort Collins, CO
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I can get voltages, I've just been a bit lazy.

The ignition switch went out about year ago, so it's relatively new. The replacement wasn't genuine so I can't comment on the quality.

Grounding may be an issue, I think the coil grounds to it's mounting bracket? I can check on that.
Although it still doesn't explain why it will naturally start once the ambient temperature has increased.
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  #8  
Old October 22nd, 2014, 11:43 AM
Roverlab
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Trevor Griffiths
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Spirit fingers. I like that.
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