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Old November 21st, 2007, 4:54 pm   #1
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Default HEI/Ignitor Mod...Need info

Okay, I can't access Probetalk at work (it's noticed as a Forum, and it's blocked), so can anyone tell me what the HEI part numbers are? I don't think the resources on how to do this mod are very good either, so when I complete mine, I will give a good writeup.
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Old November 22nd, 2007, 8:02 pm   #2
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Or not...
Anyways, I've picked one up. Can anyone tell me what the Ignitor portion of the disty is? Is it the internal transistor that provides the ground path for charging the coil?
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Old November 23rd, 2007, 3:47 pm   #3
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Okay, well, I researched the entire '95 disty thing, and I finally found (what seems to be) the proper wiring schematic for it. However, after the install, the car will not start. I checked, double checked, and even triple checked the wiring diagrams against my wiring.

Does anyone know a test procedure for this setup?

Glad I'm just talking to myself though..
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Old November 23rd, 2007, 3:54 pm   #4
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I would help you if I knew. I don't even know what that mod is though.
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Old November 24th, 2007, 11:31 pm   #5
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Well, never mind then. I got it figured. The HEI module I had was faulty.
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Old November 25th, 2007, 12:45 am   #6
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And what exactly is the mod?
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Old November 25th, 2007, 4:08 am   #7
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The HEI mod is a replacement/bypass of the stock spark igniter in the distributor (which is prone to heat-related failure on Probes). The igniter is the transistor portion that, when pulsed, opens the coil circuit, allowing the spark to occur. As soon as I can figure out a way to shrink this diagram without sacrificing the quality of it, I will post it.
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Old November 25th, 2007, 4:27 am   #8
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This is the diagram that should work for a 95-97 distributor.
Attached Images
File Type: jpg HEI Module (web).jpg (47.7 KB, 289 views)
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Old November 25th, 2007, 4:32 am   #9
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I will take some pictures Monday of my install and post them too.
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Old November 25th, 2007, 6:57 am   #10
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interesting, does the 93 and 94 have the same problem with heat? Why mod over replacing, cost?
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Old November 25th, 2007, 11:54 pm   #11
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The 93's and 94's were notorious for it. The "Ford" solution is to replace the distributor...a steep price (usually about $250-$300 for a used, $1000 new) when only the ignitor portion has failed. The HEI module only costs $15-$30, and $2 worth of wire and connectors, and you are on your way again.
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Old December 5th, 2007, 4:00 am   #12
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Not too sure if that really works for the 97 PGT. I tried it and got no results, also I heard from other forum members that the HEI mod just doesn't work correctly for OBDII systems. (96 and 97)

There was a forum member who just put a whole Blaster Ignition system in and got that working, he never posted a wiring diagram though. But if there is someone here that owns a 96 or 97 PGT that did the HEI mod I'd love to hear how you did it and if the diagram above is correct.
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Old December 11th, 2007, 4:41 pm   #13
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By all reasoning, the diagram I have for my '95 should work for a '96 or '97. The '95 disty is the same (or so I have been led to believe). I will look at some wiring diagrams today and see what's the case.
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Old February 10th, 2008, 7:27 am   #14
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Default HEI Mod

Hey buddy do you have any pics of the install at all? I am currently trying to get my probe to stop having an idle problem and have been told its the ditsy so do you have any pics of it all?
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Old April 9th, 2008, 3:15 am   #15
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found something interesting while browsing the local parts store. Accel has introduced after market HEI modules with the benefits of higher operating speed, electronic dwell control, better RFI resistance, and coil current control (prevent overheating). There are 3 options, the normal potted design, and 2 open board modules.
http://www.accel-ignition.com/Produc...minselection=7 avg bout 40$
http://www.accel-ignition.com/Produc...minselection=7 avg about 70$ (SMC based)
http://www.accel-ignition.com/Produc...minselection=7 avg about 135$ Has adjustable rev limit, open case design with large heatsink.

The reasoning of price difference I'm not sure. They are made different but don't know any added benefit.
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Last edited by rb855; April 9th, 2008 at 3:18 am.
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