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  #1  
Old 08-25-2018, 07:29 PM
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Default Big block chevy instantly shut off on me

Hi guys,
Was coming home today from a car show, driving down the street, when the car shut off instantly and coasted to a stop. I tried to re-fire the car and it touched a couple times and then nothing so I got it flat decked home. It looks like I have no spark when I pull a spark plug lead at the distributor. The car is still on stock coil and points. Any ideas on where to start? Thanks for the input.
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69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, Ridetech triple remote resevoir coilovers, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
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  #2  
Old 08-25-2018, 08:15 PM
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Pull the cap and spin the engine over with the starter, to see if the rotor is spinning. If so, are the points firing? You may need to clean them. If rotor isnt turning, you have a timing set, or camshaft problem. Double check your electrical connections at the coil, and distributor. Its a simple setup, there cant but a couple of possible issues for no spark.
Personally, Id go with a new electronic distributor and eliminate the chances of the points crapping out on you.
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70 velle' on custom chassis w/custom RideTech coilovers, RED sleeved 434 with Mamo 265s, built T56, 12 bolt 3:73, wilwood 6/4's, bla, bla, bla...build. thread https://lateral-g.net/forums/showthread.php4?t=39631
New 434 engine build here https://ls1tech.com/forums/generatio...ved-block.html

Thanks Dad!!

My Chevelle is old school... It has a belt driven power steering pump.
They're 17's, but I keep em clean!
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Old 08-25-2018, 11:41 PM
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Thanks for the input. I was actually thinking about making the change over to electronic ignition in the spring, but never had the time. My concern was that this was an instant off type of scenario, so thought maybe a coil issue. Its always run perfectly before this.
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69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, Ridetech triple remote resevoir coilovers, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
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Old 08-26-2018, 02:19 PM
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yeah, instant off is most likely ignition. check the primary voltage to the coil.
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Old 08-28-2018, 09:57 PM
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So I pulled the coil, and I had upgraded it from stock several years ago to a Pertronix coil. I was told the 0.6 ohm Flamethrower 2 was the model to use with stock points. Apparently I should have been given a 1.5 ohm Flamethrower 1, and this may be the reason the coil failed.
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69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, Ridetech triple remote resevoir coilovers, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
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Old 08-29-2018, 12:00 PM
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Quote:
Originally Posted by g356gear View Post
So I pulled the coil, and I had upgraded it from stock several years ago to a Pertronix coil. I was told the 0.6 ohm Flamethrower 2 was the model to use with stock points. Apparently I should have been given a 1.5 ohm Flamethrower 1, and this may be the reason the coil failed.
Since you mentioned wanting to update to electronic ignition, I thought I would point out IF you decide on a Mallory Unilite conversion or distributor, they require a the use of a ballast resistor OR a 3 ohm coil. I learned this because I recently blew out 2 Unilite modules instantly by connecting a "regular" (low impedance) coil.
MSD does not offer a 3 ohm coil, but Pertronix does, which works perfectly with my Unilite.
Just FYI.
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  #7  
Old 08-29-2018, 09:21 PM
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Quote:
Originally Posted by 69hugger View Post
Since you mentioned wanting to update to electronic ignition, I thought I would point out IF you decide on a Mallory Unilite conversion or distributor, they require a the use of a ballast resistor OR a 3 ohm coil. I learned this because I recently blew out 2 Unilite modules instantly by connecting a "regular" (low impedance) coil.
MSD does not offer a 3 ohm coil, but Pertronix does, which works perfectly with my Unilite.
Just FYI.
True. I have both a Unilite, and an MSD. I like the MSD better. I lost a Unilite module once as well, even with the correct resistor wired in.
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---------------------------------------------------------------
70 velle' on custom chassis w/custom RideTech coilovers, RED sleeved 434 with Mamo 265s, built T56, 12 bolt 3:73, wilwood 6/4's, bla, bla, bla...build. thread https://lateral-g.net/forums/showthread.php4?t=39631
New 434 engine build here https://ls1tech.com/forums/generatio...ved-block.html

Thanks Dad!!

My Chevelle is old school... It has a belt driven power steering pump.
They're 17's, but I keep em clean!
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  #8  
Old 09-01-2018, 09:17 PM
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Dropped in a new coil today and it fired right up. Problem solved!
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  #9  
Old 09-02-2018, 04:56 PM
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Quote:
Originally Posted by g356gear View Post
Dropped in a new coil today and it fired right up. Problem solved!
Good for you! Not too often a coil fails, but glad you figured it out, and it was a simple fix.
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Scott
---------------------------------------------------------------
70 velle' on custom chassis w/custom RideTech coilovers, RED sleeved 434 with Mamo 265s, built T56, 12 bolt 3:73, wilwood 6/4's, bla, bla, bla...build. thread https://lateral-g.net/forums/showthread.php4?t=39631
New 434 engine build here https://ls1tech.com/forums/generatio...ved-block.html

Thanks Dad!!

My Chevelle is old school... It has a belt driven power steering pump.
They're 17's, but I keep em clean!
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