No spark when cranking - Team Camaro Tech
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post #1 of 9 (permalink) Old Jul 16th, 06, 08:54 AM Thread Starter
Bob
 
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Location: Puyallup, Wa.
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No spark when cranking

I have a 67 Camaro SS that has been sitting garaged for 30 years. I recently started to restore her. I have owned the car sense it was new. I'm having a spark problem. I'm using a MSD distributor #8360, with Blaster 2 coil. The car won't start. MSD told me the distributor was bad, so I exchanged it, re set up and installed......NOT. I have 12 volt to the green wire to + on coil. When ignition is on run, I get 12 volt to both sides of coil. When cranking I get 12 volt to + side of coil and motor turns over fine, but nothing. When cranking, when key is turned off motor will pop. When i put an old plug in coil wire and crank I get no spark, when I turn ignition off it will shoot a spark. I'm wondering if ignition switch is bad? Is there anyway other than what I've done to test it?
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post #2 of 9 (permalink) Old Jul 16th, 06, 10:19 AM
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Re: No spark when cranking

Just out of curiosity did you plug your tachometer connections back into the coil? If you did unplug it and try for spark. We ran itno this on a 68 firebird that we used the same coil and distributer. Something funny with the way the tach works with this system. We unplugged ours and we got our spark back. On the wierd side when the pontiac 400 was in it had both wires to the tach plugged into the neg side of the coil. I have never seen that before but it worked. The wires were labeled and reinstalled that way and we had no spark. Unplugged it and woala. spark just a thought
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post #3 of 9 (permalink) Old Jul 16th, 06, 10:33 AM
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Jim
 
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Re: No spark when cranking

The stock wiring system includes the following:

Wire from "run" position of the ignition switch to the + side of the coil. This is a "resister wire", kinda skinny and covered with a braided white fabric material.

Purple wire to inner terminal on starter. This wire comes from the "Start" terminal on the ignition switch.

Yellow wire, runs from outer starter terminal to + side of coil.

If you have a tach, it's wire will be on the - side of the coil.

--------------------------------------------------------------

Your (or at least mine does) MSD 8360 has 3 wires.

Red supplies power to the unit, must have +12 volts with key in "RUN" and "START". Normally connected to + side of coil.

Orange is the spark trigger, and must be connected to the - side of the coil.

Black must be connected to a solid ground, coil bracket, intake manifold, or valve cover bolt.

The only green wire I am aware of under the hood of a firstgen Camaro is the wire for the temp guage or idiot light. It's no where near the distributor.

Note that the fabric covered wire is UNSUITABLE for the MSD. It needs to be cut close to the firewall connector and a new 12 guage stranded wire spliced on in it's place. Possibly this was done and that's the green wire you refer to.

I believe 67's did not power the fabric cover wire in "START", only the yellow one. The symptom would be the you get nothing no matter how long you crank it, but do get spark when you release the key to "run". This seems to jive with what you are describing.


Verify the fabric resister wire has been removed and replaced with a real wire.

Make sure there is a wire between the outer terminal on the starter and the + side of the coil.

Note that most mini starters, and some auto parts store replacement starters and late model starter don't have the second small connector, post back if that's the case with yours.





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post #4 of 9 (permalink) Old Jul 16th, 06, 10:26 PM Thread Starter
Bob
 
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Re: No spark when cranking

Ok, I got the thing to run. I removed the yellow wire from the ouside of the starter, left the purple on the inside or start terminal and now it runs, with the yellow wire danglin in the breeze . However I don't think it's charging because the gen light is on. Gauges not hooked up yet, and no tach hooked up yet. Any ideas on that one. Bob
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post #5 of 9 (permalink) Old Jul 17th, 06, 12:31 AM
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Re: No spark when cranking

if it is an old alternator it could be bad, If you have changed it out for a 1 wire then you should bypass the regulator,
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post #6 of 9 (permalink) Old Jul 17th, 06, 01:34 PM Thread Starter
Bob
 
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Re: No spark when cranking

Same alternator that came with the car originally. I had it tested and it's ok. I also had the original starter checked, new brushes and solinoid. I'm wondering now if the solinoid is bad or wrong one.
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post #7 of 9 (permalink) Old Jul 17th, 06, 01:39 PM
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Steve
 
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Re: No spark when cranking

If the alternator checks our ok, look at the voltage regulator mounted on the radiator support.
What's your voltage at the battery when the car is running?

Steve
1968 that started life and a 6 banger with a PG. Now it's a 350 with a TKO600, Moser 12 bolt, Speedtech LCA/UCA, ATS Tall Spindles, Hotchkis Springs, Forgeline ZX3P, C5 (Kore3) brakes with other cool stuff from Ron Davis, Vintage Air and soon to be Terminator EFI.


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post #8 of 9 (permalink) Old Jul 17th, 06, 01:55 PM
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Re: No spark when cranking

Check the "electrical basics sticky at the top of the elctrical forum. There's some basic electricity stuff if you need it, and a good writeup on doing voltage checks to troubleshoot the external regulator charging system.





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post #9 of 9 (permalink) Old Jul 17th, 06, 02:27 PM
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Re: No spark when cranking

Jim captured my first thought.
Quote:
Red supplies power to the unit, must have +12 volts with key in "RUN" and "START". Normally connected to + side of coil.
If ignition power is being supplied by the Accessories circuit, you'll have no power when the engine is cranking. The Ignition power circuit is what you're looking for.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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