msd 8251

rick winchester · 10-20-2022, 08:18 AM

Thanks for the info, new box came . Going to try it today. Worse case I will have a good spare.I did replace coil wire,did not seem to change but I have had bad ones before If anyone else is having a problem It is a good place to start. Sure not in any hurry to put out 800 bucks for a new box, but might have to. Thanks again. Rick .

Kirk Morgan · 10-20-2022, 01:13 PM

To answer your question about using a ohm meter to check a coil it can ohm good and be bad. The reason is that it is not under a load. We use to use oscilloscopes to look for a pigs tail showing it had good oscillation under a load.

a pontiac · 10-20-2022, 07:54 PM

Had a miss, but only under load. Drive around pits no problem. Replaced everything we had with known good parts, except msd 7al box, tried good 6al and good coil cured miss. Msd repaired 7al box for less than $150. Of course, it is now the spare after buying a new box.

rick winchester · 10-21-2022, 08:27 AM

Installed new coil, cant really tell if it helped or not. Going to try another set of plugs because they look gas fowled before buying a new box. Maybe try to find someone who has a good spare to try. Thanks Rick

Monte Howard · 10-21-2022, 05:42 PM

2 things to check,
make sure there isn’t any rust on the pick up coil inside the distributor.
Make sure the wires that run from the MSD box to the distributor doesn’t run close to the coil.

Willyracer · 10-21-2022, 07:25 PM

Rick I have spare 7AL box and a digital7 box
Also have 2 different msd coils. If you want to try.
I was going to Edgewater on Sunday but you can have them
anytime to try.

David

rick winchester · 10-24-2022, 09:33 AM

Thanks for the offer, ordered a new one. If it does not help I will use it to upgrade the Camaro. Thanks again. Rick

10-20-2022, 08:18 AM	#1
rick winchester Member Join Date: Mar 2003 Location: cincinnati ohio Posts: 209 Likes: 307 Liked 207 Times in 34 Posts	Re: msd 8251 Thanks for the info, new box came . Going to try it today. Worse case I will have a good spare.I did replace coil wire,did not seem to change but I have had bad ones before If anyone else is having a problem It is a good place to start. Sure not in any hurry to put out 800 bucks for a new box, but might have to. Thanks again. Rick . __________________ Rick Winchester Stk 3277

10-20-2022, 01:13 PM	#2
Kirk Morgan Member Join Date: Jan 2009 Posts: 230 Likes: 1 Liked 80 Times in 44 Posts	Re: msd 8251 To answer your question about using a ohm meter to check a coil it can ohm good and be bad. The reason is that it is not under a load. We use to use oscilloscopes to look for a pigs tail showing it had good oscillation under a load.

10-20-2022, 07:54 PM	#3
a pontiac Junior Member Join Date: Jan 2011 Posts: 65 Likes: 3 Liked 36 Times in 11 Posts	Re: msd 8251 Had a miss, but only under load. Drive around pits no problem. Replaced everything we had with known good parts, except msd 7al box, tried good 6al and good coil cured miss. Msd repaired 7al box for less than $150. Of course, it is now the spare after buying a new box.

10-21-2022, 08:27 AM	#4
rick winchester Member Join Date: Mar 2003 Location: cincinnati ohio Posts: 209 Likes: 307 Liked 207 Times in 34 Posts	Re: msd 8251 Installed new coil, cant really tell if it helped or not. Going to try another set of plugs because they look gas fowled before buying a new box. Maybe try to find someone who has a good spare to try. Thanks Rick __________________ Rick Winchester Stk 3277

10-21-2022, 05:42 PM	#5
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 279 Likes: 1 Liked 71 Times in 23 Posts	Re: msd 8251 2 things to check, make sure there isn’t any rust on the pick up coil inside the distributor. Make sure the wires that run from the MSD box to the distributor doesn’t run close to the coil. __________________ Monte Howard 3209 STK, 3208 SS

10-21-2022, 07:25 PM	#6
Willyracer Junior Member Join Date: Feb 2019 Posts: 88 Likes: 8 Liked 57 Times in 24 Posts	Re: msd 8251 Rick I have spare 7AL box and a digital7 box Also have 2 different msd coils. If you want to try. I was going to Edgewater on Sunday but you can have them anytime to try. David

10-24-2022, 09:33 AM	#7
rick winchester Member Join Date: Mar 2003 Location: cincinnati ohio Posts: 209 Likes: 307 Liked 207 Times in 34 Posts	Re: msd 8251 Thanks for the offer, ordered a new one. If it does not help I will use it to upgrade the Camaro. Thanks again. Rick __________________ Rick Winchester Stk 3277