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silver_pilate · 08-05-2001, 06:27 PM

Hey guys and gals,

A buddy of mine just got finished hooking up his new motor in his 1984 GT: 347 with AFR 185 heads, Victor Jr intake (I think), and big 750 carb. with a little 150hp shot of the funny.

Anyway, after he finally got it all buttoned up, he started it up. It started right up and ran just fine after he adjusted the fuel pressure. He ran it for a bit at around 2000 rpm for good measure and then shut it off. After that, he had it on and off about 10 or 12 times working with different bits of tuning of his sytem. No problems.

Then, he started it, and the engine backfired out of the carb and shut off. After some checking, he linked it back to his MSD 6AL box.

Here's what's going on as far as we can tell:

The MSD is powered off the factory Duraspark harness. When he checked the wires, for some reason, his switchable 12V lead is now full time.

The other thing is, the car isn't getting any spark when he tries to turn it over. He says when he takes the coil wire off the distributor and lays it on the A/C and manually sparks it with the magnetic trigger, it arcs just fine.

However, when he does the same thing and plugs the trigger back in and tries turning the motor over....nothing....no spark.

Anybody have any ideas??? Why would the car run fine for about 2 days and then just quit? At least we know the engine itself is sound, but what could have shorted out in the electrical systems that could cause this?

Let me know if you have any ideas. He's calling MSD tomorrow to see if they have any clues.

Thanks.

--nathan

------------------
--silver_pilate

'91 GT, Built 306, Wolverine 1087 cam, ported Windsor Jr. Irons, and all the goodies...click the link to the left to see a full list of my mods...

Tried and True 302 Being Built to Outrun You! heh heh heh...
--Texas Panhandle--
Check out my site

[This message has been edited by silver_pilate (edited 08-05-2001).]

08-05-2001, 06:27 PM	#1
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	Need help ASAP Hey guys and gals, A buddy of mine just got finished hooking up his new motor in his 1984 GT: 347 with AFR 185 heads, Victor Jr intake (I think), and big 750 carb. with a little 150hp shot of the funny. Anyway, after he finally got it all buttoned up, he started it up. It started right up and ran just fine after he adjusted the fuel pressure. He ran it for a bit at around 2000 rpm for good measure and then shut it off. After that, he had it on and off about 10 or 12 times working with different bits of tuning of his sytem. No problems. Then, he started it, and the engine backfired out of the carb and shut off. After some checking, he linked it back to his MSD 6AL box. Here's what's going on as far as we can tell: The MSD is powered off the factory Duraspark harness. When he checked the wires, for some reason, his switchable 12V lead is now full time. The other thing is, the car isn't getting any spark when he tries to turn it over. He says when he takes the coil wire off the distributor and lays it on the A/C and manually sparks it with the magnetic trigger, it arcs just fine. However, when he does the same thing and plugs the trigger back in and tries turning the motor over....nothing....no spark. Anybody have any ideas??? Why would the car run fine for about 2 days and then just quit? At least we know the engine itself is sound, but what could have shorted out in the electrical systems that could cause this? Let me know if you have any ideas. He's calling MSD tomorrow to see if they have any clues. Thanks. --nathan ------------------ --silver_pilate '91 GT, Built 306, Wolverine 1087 cam, ported Windsor Jr. Irons, and all the goodies...click the link to the left to see a full list of my mods... Tried and True 302 Being Built to Outrun You! heh heh heh... --Texas Panhandle-- Check out my site [This message has been edited by silver_pilate (edited 08-05-2001).]