Slant Six Forum
https://slantsix.org/forum/

HEI CONVERSION NO SPARK
https://slantsix.org/forum/viewtopic.php?t=65937		 Page 1 of 2
Author:  welj31 [ Wed Apr 21, 2021 1:42 pm ]
Post subject:  HEI CONVERSION NO SPARK
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
Author:  Badvert65 [ Wed Apr 21, 2021 4:32 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
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.
Author:  Rick Covalt [ Wed Apr 21, 2021 6:04 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
Not trying to be dumb but is the rotor spinning? And you do have power to the coil and HEI module ?
Author:  welj31 [ Thu Apr 22, 2021 6:19 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
Quote:
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.
Author:  welj31 [ Thu Apr 22, 2021 6:44 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
When i test across the dizzy wires i get a reading of 234 - 265 ohm on both dizzy???
Author:  welj31 [ Thu Apr 22, 2021 8:14 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
it seems as if i am not getting a signal from the dizzy (either one). Very odd.
Author:  Badvert65 [ Fri Apr 23, 2021 8:10 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
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....
Author:  welj31 [ Fri Apr 23, 2021 7:27 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
Quote:
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.
Author:  DusterIdiot [ Sat Apr 24, 2021 7:02 am ]
Post subject:  D
D
Author:  Badvert65 [ Sat Apr 24, 2021 5:36 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
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.
Author:  Joshie225 [ Sat Apr 24, 2021 8:11 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
Quote:
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.
Author:  Rick Covalt [ Sun Apr 25, 2021 4:05 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
Good to know. What is a good AC reading?
Author:  welj31 [ Mon Apr 26, 2021 11:41 am ]
Post subject:  Re: HEI CONVERSION NO SPARK
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
Author:  welj31 [ Mon Apr 26, 2021 1:04 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
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 ???
Author:  Rick Covalt [ Mon Apr 26, 2021 4:41 pm ]
Post subject:  Re: HEI CONVERSION NO SPARK
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
Page 1 of 2 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/