Need help! No spark
Thread Starter
Racer
Joined: Jan 2008
Posts: 299
Likes: 4
From: Surprise AZ
Need help! No spark
1978 corvette L82 350 4 speed, turn the key no spark, then turn the key again has spark. Wire to the dizzy is hot. Replaced w/new dizzy still no spark. Pull spark plug no spark. Then sometimes it has spark. Wires tight on starter. trying to get car started, never heard it run. Been parked for over 10 years. Any ideas. thanks 
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
1978 corvette L82 350 4 speed, turn the key no spark, then turn the key again has spark. Wire to the dizzy is hot. Replaced w/new dizzy still no spark. Pull spark plug no spark. Then sometimes it has spark. Wires tight on starter. trying to get car started, never heard it run. Been parked for over 10 years. Any ideas. thanks
Thread Starter
Racer
Joined: Jan 2008
Posts: 299
Likes: 4
From: Surprise AZ
Also I get no spark when the engine is cranking, and sometimes I do get spark. with key on I have 12+, start cranking I have no spark to the plugs. and sometimes I do. any help let me know. I have to get to a appointment.
Race Director
Joined: May 2006
Posts: 18,734
Likes: 2,582
this is the circuit diagram, when cranking and no spark do you have 12+ volts at the distributor
http://willcoxcorvette.com/product_i...6ff078cc98305a
http://willcoxcorvette.com/product_i...6ff078cc98305a
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Racer
Joined: Jul 2009
Posts: 344
Likes: 5
From: oak harbor wa
eliminating parts
Well you have eliminated the dist if you put in a known good one a slight trick to try
Get a test light with long enough leads you can see it if it lights up while you're cranking. Prod or poke the power wire going to the dist and crank.
Keep tracing back along the wire amd see where it is losing the 12v until you get a steady light.
Im not saying it'll work but ive used this system before and found the break in connections
Get a test light with long enough leads you can see it if it lights up while you're cranking. Prod or poke the power wire going to the dist and crank.
Keep tracing back along the wire amd see where it is losing the 12v until you get a steady light.
Im not saying it'll work but ive used this system before and found the break in connections
Burning Brakes
Joined: Apr 2008
Posts: 1,222
Likes: 93
From: shelbyville West Michigan
before you start firing the parts cannon at it, or rather firing another round, test the wiring. 78 should be HEI. before replacing distributr test the module, cap, rotor, do you have 12v at the power wire? you do know you don't get spark when the key is on, the engine has to be cranking. if the power to the dist. is what is intermittantly missing, trace it back, after ruling out bad connector. what happens if you hot wire it? run 12v to the dist from batt and crank the engine, does it have spark then?
