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Old 08-26-2005, 06:02 PM
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Msd ign. problem

I've got a 79 ford PU here, Ez wire kit installed, MSD 6 offroad ign, Holley projection TBI on a big block. I checked all my wires, they are correct as best as I can tell,{unless I've gone braindead again}. It will fire momentarily on startup, but quits as soon as it fires. I checked for power at a few places. I have 13V at the dist. {msd} and at the msd6 box. Power in the trigger wire{white} off the dist. is 9.4 and at the coil it is only 1.8V. The power at the coil is consistent even with the ign off, and it goes spaztic{is that a word?} when you crank the motor. Any ideas?

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Old 08-26-2005, 07:42 PM
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fire in the hole

Do's it kick then die as soon as you
let off the key?
If so make sure you're not loosing your
fuel signal.
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Old 08-27-2005, 06:07 PM
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Thats exactly what it does. The fuel signal stays. I think it's related to the lack of power at the coil, so the coil can only develop enough juice to fire a couple times and then can't keep up. I have no idea what would cause this. There is no rev. limiter hooked up. Could the msd box think the motor is overreving and be cutting the power to the coil? To complicate matters the whole setup came to me in a box with most of the instructions missing. I managed to pull some wiring diagrams off the holley site, but this seems to be an ignition problem?
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Old 08-28-2005, 07:56 PM
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Fire in the hole

Some of these systems will shut off
if the voltage drops under 12.5, even just for a second.
so you can't over double check this.
The most embarassing thing is to find you dont have
the rotor installed. Not that its ever happened to me.
KYWT
D
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Old 08-29-2005, 10:35 AM
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The rotor is in. {I've never forgotten one either } The part that really confuses me is the low voltage at the coil and that it remains even with the ign. off. What kind of test can you do to check if the msd box is the culprit? The manual {I've tracked one down} says if there is 12 volts going in no spark the box is gone. I do have some power and a sort of spark, so I'm not ready to go buy a new box hoping it fixes it, without more info.
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Old 08-29-2005, 03:20 PM
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Try using a test light and hook it to the "+" terminal of the coil. It should light at: key on, start and run. You could have a mis wiring problem giving you power to the coil at start but not at run. This would cause your problem. Also hook it up to your power wire to the msd box and see what you get there. It should light at: key on, start and run. If you have power at each place and at all the times listed, the msd box could be at fault. Msd has a very good troubleshooting area on their web site. I dropped a wrench on the ignition terminal wiring block on my hot rod Vette and shorted my msd box out, killing it. I used their web site to trouble shoot it and then contacted their tech department to see what it would cost to fix it. I told them how I screwed it up and they had me send it to them. They not only Fixed It for FREE, but they sent it back postage paid. Now thats Customer Service!!
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