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 Post subject: HEI CONVERSION NO SPARK
PostPosted: Wed Apr 21, 2021 1:42 pm 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
OK We did this on a 83 D150 with slant six 225 ci. last year. Ran great for about a year. Backed up a small hill....heard a pop noise and truck stalled. Now wont restart. Replaced the coil, ICM, Relay, and the dizzy (all new). Already has new plugs, wires, cap and rotor.
Still no spark. Thanks for any help


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PostPosted: Wed Apr 21, 2021 4:32 pm 
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Turbo EFI
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Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
I don't know of any specific troubleshooting tips. Back in the day, the GM guys would usually carry a spare module and rotor (for coil in cap applications). You can measure the resistance of the distributor pickup, I forget the resistance range, but you are basically looking for an open circuit. Coils can go bad, but they are basically simple devices and not really prone to failure. The modules were the weakest link back in the day. Even more so these days because of the poor quality of replacement parts available.

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PostPosted: Wed Apr 21, 2021 6:04 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
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Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Not trying to be dumb but is the rotor spinning? And you do have power to the coil and HEI module ?

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PostPosted: Thu Apr 22, 2021 6:19 am 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
Rick Covalt wrote:
Not trying to be dumb but is the rotor spinning? And you do have power to the coil and HEI module ?


Yes rotor is spinning. !2 volts to coil and ICM. However I have noticed the wires from ICM to the dizzy show 3.5 volts and I am not sure why.


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PostPosted: Thu Apr 22, 2021 6:44 am 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
When i test across the dizzy wires i get a reading of 234 - 265 ohm on both dizzy???


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PostPosted: Thu Apr 22, 2021 8:14 am 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
it seems as if i am not getting a signal from the dizzy (either one). Very odd.


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PostPosted: Fri Apr 23, 2021 8:10 am 
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Turbo EFI
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Posts: 1165
Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
You can't properly test the distributor pickup with a volt meter. The resistance you measured seems ok. My bet is still the module.
jus sayin....

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PostPosted: Fri Apr 23, 2021 7:27 pm 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
Badvert65 wrote:
You can't properly test the distributor pickup with a volt meter. The resistance you measured seems ok. My bet is still the module.
jus sayin....

Had the shop double check new and old ICM .. New one good old one bad. Will get back to it on Sunday.


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PostPosted: Sat Apr 24, 2021 7:02 am 
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Board Sponsor
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9711
Location: Salem, OR
Car Model:
Quote:
You can't properly test the distributor pickup with a volt meter.


Yes you can... if the pickup and tooth are aligned you get a reading of 0-200 (pending gap and oem reluctor vs. aftermarket crap),
when you are between teeth you will get the high resistance reading (Pending above noted conditions 300-inf). Checking the gap
also will help .008-.010 gives best results (.012-.016 will give poorer readings and can cause misfires/lack of spark). Cheap reman
units have reluctor teeth that are not 100% uniform and can change the gap (I love Cardone units that have 1 tooth that can gap
at .008, then the remaining 5 teeth are at .014)... I can also note that compared to a few other brands of EI and hall effect
distributors that the Mopar EI unit when the shaft is rotated and checked will look like a sine wave through its resistance values,
and not absolute when going from say 150 to 450 to 150...

Typically when a mopar EI dizzy wont give spark it comes down to bad gap or pick up coil, EI module not working/no power, or the
gear is broke/shaft seized. Make sure to carry a spare EI module just in case. I had one old timer who used to check dizzy function
by removing the dizzy, leaving the cap and wires on, turn the ignition on, and roll the shaft...if the pick up was good the charged
cylinder in the block would go bang... :roll:


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PostPosted: Sat Apr 24, 2021 5:36 pm 
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Turbo EFI
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Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
Quote:
Yes you can... if the pickup and tooth are aligned you get a reading of 0-200


I meant that you can't really check it with VOLT meter, but you can with an OHM meter.
Sorry for the mis-understanding.

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PostPosted: Sat Apr 24, 2021 8:11 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7794
Location: SW Washington
Car Model: 1965 Plymouth Barracuda, 1954 Dodge C1-B8
Badvert65 wrote:
Quote:
Yes you can... if the pickup and tooth are aligned you get a reading of 0-200


I meant that you can't really check it with VOLT meter, but you can with an OHM meter.
Sorry for the mis-understanding.


Actually, you can do a test with a volt meter as well. The pickup generates an AC voltage as reluctor teeth pass the pickup. You can see this on an volt meter pretty easily when set to AC. Turning the distributor faster increases the voltage output.

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PostPosted: Sun Apr 25, 2021 4:05 am 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6921
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Good to know. What is a good AC reading?

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PostPosted: Mon Apr 26, 2021 11:41 am 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
Ok We went over every connection again, new coil, ICM, Dizzy. It started right up quickly and ran at high idle for a couple minutes. I had to shut it down as we were not expecting it to start and had left the dizz hold down clamp off. Turned key off and it shut down. Took the battery charger off (it was only on a 2 amp setting). Installed the hold down and went to restart. Cranking not starting. Checked and have no spark again.
1) Noticed I get a single spark when I first try to start (first bump). We are using a remote starter switch right off the starter.
2) Noticed in the past when I would turn the key off I could feel the motor rotate ....not a lot but I could see the fan blade move 1/2 inch or so.
3) Also have now noticed the seat belt warning light/buzzer will come on sometimes and not other times.
Starting to think maybe a ignition switch problem. I think we could bypass the inside switch and use remote switch to test the idea. Of note when it started I was using the remote switch. Huuuuuummmmm


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PostPosted: Mon Apr 26, 2021 1:04 pm 
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2 BBL ''SuperSix''

Joined: Sun Apr 18, 2021 10:23 am
Posts: 11
Car Model: 1983 DODGE D150 SLANT SIX 225CI AUTO
update Well i am at a loss. We got it running again by "PULLING UP ON THE DIZZY" just a 1/8 to 1/4 inch or so. When it is fully seated on the block pad it will not start. WTH???? Is there a bushing or something that spaces this dizz up ???


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PostPosted: Mon Apr 26, 2021 4:41 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6921
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Pull the distributor out and look at the bottom gear. How much play, up and down, does it have. Something is wonky here! Double check everything inside the distributor. If the only thing that makes it start is the distributor being pulled up a little then something is wrong with the distributor somewhere. Good luck. :D

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2 Mopars come with Spark plug tubes. One is a highly refined, world class, racing machine. The other is a 426 CI. boat anchor!
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