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PostPosted: Wed Jul 23, 2014 11:24 am 
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Joined: Mon Aug 28, 2006 11:54 pm
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Location: Pelahatchie, MS
Working on a 66 GTO for a friend. Body work mostly. But the engine was just installed prior to bringing it to me. (Owner drove it over, first time it had moved in almost 30 years). wiring was hacked, and I straightened it out. Engine is mostly stock 400 with 6x heads and a mild cam, backed by a Muncie 4 speed. I pulled the trans because the installer did not tighten the flywheel bolts properly, and it had a slight knock. ( I did this between Thanksgiving and Christmas). Couldn't get the trans in by myself, as it seems I am getting old... Last week i finally got some help and put the trans in, and finished buttoning everything up as I had time.

Owner came by a few days ago, and we tried to get it running. Put fuel in the new tank I had installed, and I put some on the float bowls of the new Holley via the overflow tubes. Connected the battery and spun it over.

Fired right up and ran. I would say about 45 seconds or so and died. Got my trusty spark tester out, and no fire to number one. Put my multimeter on the power wire for the HEI, and battery voltage was present. The distributor in the car is an aftermarket GM HEI copy,. Owner said he thought it was an Accel, but I am not so sure. It has a red cap, and did not come with a coil, so they had installed an old coil. I have a new Accel for a SBC in the parts stash so I swapped the cap/coil over, no fire.

Owner came by today and we tried a new module with the same result. Verified dizzy would spin by motor, dizzy is not loose, time is where it was when it was running. Pulled a valve cover and verified cam was turning (Doubtful a new chain broke, but you never know). Ran a hot wire from the battery straight to the dizzy, same result...

SOOO... power into dizzy, no voltage out, new dizzy, new coil, new module...

Any ideas?

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PostPosted: Wed Jul 23, 2014 5:04 pm 
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Joined: Mon Dec 22, 2003 11:34 pm
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Location: Caldwell ID
Try granding the tack to the battery. Is the mother got a good ground.

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PostPosted: Wed Jul 23, 2014 8:50 pm 
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Location: Camarillo, CA
Not to sound stupid here but are you sure the terminals are correct placement when the coil was installed?

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PostPosted: Thu Jul 24, 2014 8:50 am 
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Location: Baytown,Texas
I have had them carbon trail and ground out , but probably not the issue here . What is the voltage to the HEI ? most 66 models were points and GM used resistor wire to feed the points . When started the voltage was 12 until the wire warmed up and dropped the voltage to around 6 volts . Typically the wire will be white with a woven coating . This must be replaced all the way back to the fuse block by unbolting the engine side of the fuse block and replacing the connector with a new wire and connector all the way to the HEI . Napa has the connector .


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PostPosted: Thu Jul 24, 2014 8:58 am 
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Location: Baytown,Texas
http://chevellestuff.net/tech/hei.htm


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PostPosted: Thu Jul 24, 2014 11:27 am 
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I did the wire thing after it got here. It has full voltage from what i see. During testing, I ran a hot wire to the battery, and still no spark. No Tach hooked up. I am going out of town, and will not get to it until Monday, but i am going to check the pick up coil second. I saty second thing, because after thinking it over I remember something. First thing I am going to do is check the coil ground. To install the plug wires on the Accel coil and cap i had on hand, the coil top had to be removed, as the cap had built in plug wire retainers. Possible that the ground wire slipped off while being reassembled. (Stupid design, IMO. ) As the coil ground ring terminal just slipped over one of the mounting screws...

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PostPosted: Thu Jul 24, 2014 12:09 pm 
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Joined: Sun Jan 22, 2006 1:11 am
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Location: Baytown,Texas
Make sure the carbon button didnt get broken when cap was installed . Ohm out the pick up coil as the distributor has to be disassembled to change it .


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