When I did the duraspark swap I thought I would be crafty and keep the stock e coil. Hotter = better right?
I was kind of a newb and I also left the computer in it. Didn’t really track what all was still going to it. 2.8 ran great (ignitionwise anyway) from 06-11 when I did the V8 swap.
Post V8 swap every once in awhile it would cook a coil and/or the ignition module. Internet says they are not made as good as they used to be yadda yadda so I got one with a good warranty and just keep trading them.
Broke out my Ford shop manuals, poinpoint voltage everywhere, spacered the module up so it could get airflow under it, moved it ahead on the inner fender so air could directly blow on it, added a resistor the main power wire for the module, added a ground wire to ensure the distributor (which normally just grounds where it mounts on the block) to make sure it had a good ground... got nowhere. Then I started chasing loose ends in the wiring... Ah ha! The computer is still getting a tach signal! I bet that is it! So I eliminated that and trashed the computer.
Then I would get approx 15 min before something died.
Like right after I did it I had it was idling by the garage and it cooked the new module, I couldn't have killed the module any deader with a 30-06.
Google eventually saved me when after years of searching I found ONE guy on the whole interweb that mentioned the e coil doesn’t have the right resistance and will kill modules. Apparently going in the computer added enough resistance to the tach signal that it would take longer for the ignition stuff to get hot. And the 2.8 with fewer tac signals + the computer allowed the ignition to still function ok.
I put in the round Duraspark coil and it has been faultless for like three years now. I have put more miles on it the last two years (going to Southington and Badlands) than I ever have any two years prior and it has not missed a single beat.
It really burns me because I know back when I was still rocking the 2.8 or therabouts I know another member (
@Twister, I can't tag him for some reason) was cooking ignition stuff and I guarentee it was for the same reason. But I unknowingly had the computer still in line to keep it working and he didn't.
My Carquest Duraspark module died over the weekend, only O'Reilly's was open so I bought a new one to get it moving (it moved for about an hour and then it died too) So I got the better one with a lifetime warrenty the second time (wasn't for sure what was wrong or I would have the first time)...
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Way back around 2007-2008 I durasparked my 2.8. Used a JY Ford Duraspark box and kept the factory E coil. When I swapped in the 302 in early 2011 it was plug and play with a reman '85 Mustang dizzy and worked great. Late 2011 I got a new radio and with the dash all apart I hadn't noticed the...
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Done dealing with Duraspark, I want something reliable. At this rate I think going to points would be an improvement. I know about the HEI dizzy, I haven't ruled it out but really would rather not go down that road. MSD vs Streetfire vs Mallory Hyfire vs Stealth HEI... dunno what is better or...
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PAYDIRT!
I have been having a nagging issue of burning up the factory e-coils and DS modules in my '85 and have been doing some digging around on possible causes. One thing I noticed in my '85 service manual for the 2.0L (which ran Duraspark) is it had a "ballast resister" feeding the coil. This is the...
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