msd ignition

[Don Eckel 111]

I've had a couple of these annoying instances over the years during which we seemed to change everything electronic under the sun. The first, as stated above, was a bad over rev RPM chip. The second was a little more odd. As it turns out a small water circulating pump we use had to be changed a week prior to a miss that developed. Apparently the windings in this particular pump were different. We eventually found it on the suggestion of putting an MSD tester on the car and turning every switch in the car on and off, 1 at a time. When we hit the water pump, the tester went nuts. I had several of these pumps on the car before without a problem. So give the tester a try, you might save some serious headaches.

[R&S Motorsports]

I had this same problem these can be very frustrating mine ended up being the High rev RPM port was bad no matter what chip I put in it would do the same thing than I ran a run without a chip and the problem went away. I send the box to MSD got it back after they said it was repaired put a chip back in and it did the excact same thing finnaly I just replaced the box and never had a problem since.

[Hypertoys]

I had tha same problem,the car would break down juat a few times on a run near the finish line and not on every run. I sent the 7al-2 back to MSD 2 times and each time they said it tested ok ,I removed the HIGH rpm chip from the 2 step and that solved my problem.The only problem I now have is that I still don't run the High chip.

[Chris Cogan]

I once had a similar issue with a 7AL3 box. To make a painfully long story short, it turns out that the 7AL3 didn't like a 12 volt system. At least that was the story I got from MSD back in 2003 when I had the problem. The documentation that came with the box back then said that it would operate between 12 and 16 volts. But I had a miss above 5000-5500rpm that I couldn't figure out on the dyno. Sent the box back in exchange for a digital box and the problem was gone. Don't get me wrong, I'm a fan of MSD's products and I use them on everything. This just happens to be the one problem that I have had with one of their products. Take care.