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73-87 Chevy _ GMC Trucks => Performance => Topic started by: 197 on November 24, 2008, 08:37:06 PM

Title: Msd Blaster Coil Help!!!
Post by: 197 on November 24, 2008, 08:37:06 PM
 ??? Dont know where to put this.

I ordered a new MSD Cap, Plug Wires, and a Blaster 2 coil with the resistor for the points. I have the pentronics points conversion installed. I cant get it to run with the MSD Coil on it. It will fire and then die, unless I WOT it, then it will start and run fine.

I have tried it with and without the resistor and it does the same thing. If I swap the old coil back on it starts up perfectly!

Help Anyone???

Heres my Parts on My Ingtion:
http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductBrowse?tf=Browse&Pr=p_Product.CATENTRY_ID%3A2005114&catalogId=10101&Nty=1&productId=2005114&mediaCode=ZX&Ntx=mode%2Bmatchallpartial&Ntt=pertronix&N=111%2B200729944%2B1973%2B10101&storeId=10101&Ntk=AllTextSearchGroup
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MSD-8214&N=700+0&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MSD-31379&N=700+0&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MSD-8202&N=700+0&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MSD-8437&N=700+0&autoview=sku
Title: Re: Blaster Coil Help!!!
Post by: choptop on November 24, 2008, 09:24:37 PM
Im a little lost here. You have the Petronics ignition installed and the coil is for points??? I thought the Petronics got rid of the points. Somethings doesnt sound right. ??? Sounds like the wrong coil.
Title: Re: Blaster Coil Help!!!
Post by: 197 on November 24, 2008, 09:32:43 PM
The coil is for either or to my knowledge. Thats why you have to buy the optional resistor. Ive tried it both ways with the same results.
Title: Re: Blaster Coil Help!!!
Post by: choptop on November 24, 2008, 09:41:00 PM
Ok, I see it now. I think you may have a faulty coil,(even though its new, it is possible) since you can put the old one on and it runs fine.
Title: Re: Msd Blaster Coil Help!!!
Post by: VileZambonie on November 25, 2008, 12:51:59 PM
How do you have the coil wired up? Either explain in detail, draw a schematic or take a picture. If you aren't using points you should be able to run the coil without the resistor. You should have B+ key on and during cranking at the coil. The negative side of the coil should be wired to your trigger device.
Title: Re: Msd Blaster Coil Help!!!
Post by: 197 on November 25, 2008, 01:20:53 PM
It's hooked up to the with the factory wires, just like the old coil. I'll try unhooking my tach but I don't think that's causing it.

How do you ohm these coils?
Title: Re: Msd Blaster Coil Help!!!
Post by: joesgarage71 on November 25, 2008, 06:22:23 PM
 I have had problems with the MSD coils before. Take it back for a new one.
 Steve
Title: Re: Msd Blaster Coil Help!!!
Post by: VileZambonie on November 25, 2008, 07:10:15 PM
Primary resistance Ω across the + and -. Secondary Ω from either side of the coil to the center high terminal. Check resistance Ω to either terminal to the case.
Title: Re: Msd Blaster Coil Help!!!
Post by: 197 on November 25, 2008, 08:49:56 PM
Primairy I get .800ohms
Secondaty I get 5.05ohms

Specs are
.700ohms
4.7ohms