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PostPosted: Thu Feb 09, 2017 10:34 am 
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1 BBL (New)

Joined: Wed Feb 01, 2017 3:42 pm
Posts: 3
Car Model:
I have converted my 73 w100 360 to HEI. Once it is running it works. However I have a really hard time getting it to start. the engine only seems to "catch" when I let off the key. Any thoughts?


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PostPosted: Thu Feb 09, 2017 10:54 am 
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Turbo EFI
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 1200
Location: Rome, GA
Car Model: 1963 Dart 270, 1980 D150
I would think you are not getting enough power to the ignition. I relayed mine straight from the battery and she starts and runs great.


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PostPosted: Thu Feb 09, 2017 11:11 am 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13008
Location: Fircrest, WA
Car Model: 76 D100
Have you tried reversing the leads to the distributor? Did you remember to remove the ballast resistor and put a jumper in its place?


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PostPosted: Thu Feb 09, 2017 11:43 am 
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1 BBL (New)

Joined: Wed Feb 01, 2017 3:42 pm
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I have already reversed the leads it did not help. I will try that again. I will check to see if I have power when the key is moved to start.


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PostPosted: Thu Feb 09, 2017 11:54 am 
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Supercharged
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Joined: Sat Feb 16, 2008 1:25 pm
Posts: 5599
Location: Downeast Maine
Car Model:
Mopar stock ignition design has two circuits: "start" that supplies a full 12v to coil when starter is engaged; "Run" circuit is energized when key is in run position and ballast resistor is part of this stepping down 12v to 8v or so a level stock coil can live with. Only one of the two circuits is energized at any given time.

If you are not getting light-off during starter engagement, that start circuit is not able to supply voltage to coil for some reason. I think you need to tie the run and start circuits together.

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PostPosted: Thu Feb 09, 2017 1:23 pm 
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1 BBL (New)

Joined: Wed Feb 01, 2017 3:42 pm
Posts: 3
Car Model:
I feel like an idiot. I did not wire the "start" wire to the coil/HEI. I had only run the ignition on wire.

hooked up the start wire and it works like magic.


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PostPosted: Thu Feb 09, 2017 1:37 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13008
Location: Fircrest, WA
Car Model: 76 D100
:wink:


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PostPosted: Thu Feb 09, 2017 4:45 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 8284
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Quote:
I feel like an idiot


I feel like that quite a bit! Welcome to the club, your in good company. Glad it was an easy fix.

Rick

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!
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PostPosted: Thu Feb 09, 2017 4:54 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13008
Location: Fircrest, WA
Car Model: 76 D100
Rick Covalt wrote:
Quote:
I feel like an idiot


I feel like that quite a bit! Welcome to the club, your in good company. Glad it was an easy fix.

Rick


Yeah, its a rare day when I don't feel like an idiot! That just means I am always learning new things.


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PostPosted: Fri Mar 24, 2017 7:55 am 
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1 BBL (New)

Joined: Thu Mar 09, 2017 11:51 am
Posts: 7
Location: Durham, NH
Car Model:
Reed wrote:
Rick Covalt wrote:
Quote:
I feel like an idiot


I feel like that quite a bit! Welcome to the club, your in good company. Glad it was an easy fix.

Rick


Yeah, its a rare day when I don't feel like an idiot! That just means I am always learning new things.


Ha, I'm an ASE certified mechanic (http://www.dulleschryslerdodgejeep.com) and stuff like this happens to me too. It really irritates me when it does but you know Murphy's law. The guys above have nailed the answer. HID bulbs draw a lot of power, especially on startup. If thats starving your ignition, yup...it might not start. Thanks for sharing this with everyone!

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