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HEI ignition conversion problems https://slantsix.org/forum/viewtopic.php?t=30306 |
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Author: | Dakota_Don [ Thu Jul 31, 2008 11:24 am ] |
Post subject: | HEI ignition conversion problems |
hey I am doing a GM module/mopar ignition conversion on my 68 dart, here is the problem, no fire, but if i remove the dist and turn it by hand it will light up my timing light. so assume the ignition is firing when thishappenss, the dist is also NOT grounded at this time (how-ever ) the GM module is here are my parts rebuilt electronic Dist MSD blaster 2 coil new blue streak cap/roter new wires GM moduleNAPA tp 45 module, and a new module from autozone Heres how its hooked up C=Neg side of the coil B=pos side, and batt source Im getting 12.65 Volts ( batt volts) W= pos lead of pick up coil (orange wire to the dist pickup coil) G= neg lead Blk wire to the pick up coil the ballast is bypassed to get 12v at the coil things i have done I have tried switching the pickup wires. I have tried switching modules the module is grounded, I am getting 12.65 V to the module on the B term, but even on the Neg side of the coil i get that reading as well?? I even swaped coils I HAVE unhookedeverythingg and tried it again and again, I looked at two diagrams and they are the same, I just cant seem to figure out why it will light up the timing light with the dist out of the car and hooked up. But will NOT light it up down in the car, oh the dist is turning in the engine.. anyone have any ideas? I know its a GM module but it tucks up nicely under the dist. I have also been told i shouild run the ballast with this setup to.. thanks for your replies |
Author: | 00spy [ Thu Jul 31, 2008 4:25 pm ] |
Post subject: | |
How is the module grounded ? Ive got mine by running a wire from the module to the ground of the alternator. I would probably say others would tell you to move the module to maybe the fender. I dont know too much , but am learning , I hope you figure it out Dave |
Author: | SlantSixDan [ Thu Jul 31, 2008 4:36 pm ] |
Post subject: | |
When you measure 12.65v at the module, what're you measuring across the battery? |
Author: | Dakota_Don [ Fri Aug 01, 2008 7:06 am ] |
Post subject: | |
hi ty for the replies, the module is grounded with a wire running to the body of the car, , plus it is mounted under the dist on an aluminum heat sink, the 12.65 volts is from the battery, the battery has been sitting about 3 wks, so im sure the Volts have droped some, I do have the same V reading at the battery as I do the coil and module @12.65 which should be plenty of Volts to crank up the ignition, what is strange is when the dist is removed and still conected, it will fire if i turn it by hand, the dist is touching nothing but my hand, but when i install it in the engine i get nothing, i know the pick up coil is new, but could it be defective? |
Author: | SlantSixDan [ Fri Aug 01, 2008 7:26 am ] |
Post subject: | |
Quote: hi ty for the replies, the module is grounded with a wire running to the body of the car
This may be a part of the problem. Body sheetmetal grounds are frequently of poor quality; ground your electrics to the alternator housing or the battery negative terminal.Quote: the 12.65 volts is from the battery, the battery has been sitting about 3 wks, so im sure the Volts have droped some, I do have the same V reading at the battery as I do the coil and module @12.65 which should be plenty of Volts to crank up the ignition
But what's the voltage to the module while you're cranking the engine? Under starter load, the voltage may be dropping below what the module needs in order to fire.
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Author: | Dakota_Don [ Fri Aug 01, 2008 11:42 am ] |
Post subject: | update |
well i have tried it again, the V at the module is 12.65 with key on, and drops about 1.5 V when i try to start it, which isnt bad i think for the old 68, i even charged the battery up some.. I even grounded it (module) to a better place, still nothing I even tried a new module again.. re-wired it again and nothing.. I have exellent connections and wire.. anyway im done, i wired up a mopar factory harness with a FBO box and MSD blaster 2 off my other car, and it fired up the first time.. I may try this conversion again someday, cuz i do like the idea of hidding the module out of site.. thanks for the help fellas |
Author: | SlantSixDan [ Fri Aug 01, 2008 12:42 pm ] |
Post subject: | |
The "module out of sight" trick with it mounted to the underside of the distributor works fine on V8 engines with the distributor up top, but I'm uneasy about this module placement with the down-low distributor of a slant-6 engine. Too much risk of road splash and such. And I have to wonder if your module wasn't maybe grounding out on something adjacent... |
Author: | Dakota_Don [ Fri Aug 01, 2008 9:43 pm ] |
Post subject: | |
yes i like the out of site trick, and please dont boot me, cuz it is a 68 dart v8 318, I know this is a slant 6 site, but a few people recomended that I come here and ask you fellas, Do you think it could be possible the used module I had checked could be bad, as well as the new one? the pick up coil is a new one that came with the rebuilt dist, and the module is right under that on the dist (outside) could the pick up not be compatible? or could it give off a signal that interrupts the module? I do want to try this gain, I know it has to be a simpe solution. is there anyway to check a module with an ohm meter? thanks again |
Author: | slantvaliant [ Sat Aug 02, 2008 11:48 am ] |
Post subject: | |
Quote: Do you think it could be possible the used module I had checked could be bad
It's possible. The first one I tried in my conversion went bad, but then it was not OEM, either. A quick swap to a used AC/Delco part fixed it.
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Author: | Dakota_Don [ Thu Aug 07, 2008 4:26 pm ] |
Post subject: | |
thank, I had them both checked again and they supposedly are good, maybe I will NOT mount it under the dist.. and try it again thanks |
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