Like the title says, I was driving down the road and the engine shut off. Like a switch flipped. I pulled over and started looking at the obvious. It's getting fuel and I had a dvm so I looked at the voltage at the distributor and found 12v. So I replaced the coil since I had one.Still no start. I was hoping someone had a few pointers or places to start looking. I bought this car 6 months ago. It's a 75 350 4sp that's had a little work done but its mild and drives well. Any help us appreciated, Pat

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Daytona Yellow '75 350 Muncie 4 spd

Since no one has answered yet, I would check for spark at a plug and then on the main wire going from the coil to the distributor.  If those check out, check  the plugs.  I think they should be wet from the gas of trying to start it.  Or they may be cmpletely fouled.  Let us know What you find out.

|UPDATED|10/16/2015 8:28:52 PM (AZT)|/UPDATED|

Sounds like a typical ignition module failure....

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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Thanks for the reply. Could you elaborate a bit on what I might be dealing with? Please. Pat

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Daytona Yellow '75 350 Muncie 4 spd

Thanks, it's an hei so the coils on top of the distributor and I replaced the cap and coil. Hoping to get more detail on the ignition module. Tbanks, Pat

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Daytona Yellow '75 350 Muncie 4 spd

2. Sudden Failure

Ignition modules may stop working abruptly because of loose or corroded electrical connections. In this case the vehicle will stall unexpectedly during operation and not start again. Check the switch. Clean oxidized terminals and replace broken wires if necessary. The circuits may also be critically damaged by overheating if the problem is not addressed after the first or second occurrence. If you cannot start the car, testing the functionality of the ignition control module might seem difficult. Use a light timing tester to check the output of the module. Connect the timer to the positive terminal of the battery and check the continuity of the black output wire while cranking the starter. If the light blinks, the module is good. If the light is blank or constant, the module is bad. Before you attempt to replace the control module, you must rule out other ignition system components. The module is expensive and replacing it is a laborious process. Check the ignition coil for a spark. Examine the wires at the cap, rotor, and spark plugs. If the car runs but has timing problems, use a tester light and wrench to adjust the spark plug timing according to the manufacturer’s specifications.

I found this on the internet.  While my car has HEI, I know nothing more about the ignition module on any corvette.   Someone on here will respond and we both will be educated.

I the course of two years I went thru two of these until I got a good one.  When my '81 warmed up it would quit until it cooled off a little.  The third ones been fine for years now.  Take your distributor cap off and it's under the weights on the drivers side of the distributor. 

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Thank you so much, that is what I was looking for. I am at work trying to do this on my cell phone. I will try to find one tomorrow am.

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Daytona Yellow '75 350 Muncie 4 spd

for what is it worth take it for old timer   don't believe new coil is good I seen new be bad but reading from the form  I thing I wood look at ign moduale   and check voltage at coil coming and going     good luck      dwa

Aurthur, I emailed you the testing procedures for the HEI system. There is one other test for the ignition module that is not included...I'm still digging in my files to find it. I'll send it when I do. 

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Thanks a lot for that, I really appreciate the effort I saw the pdf this morning as I pulled up to the car with a new Ignition Module. Swapped the old for the new and it starts right up. In the process I replaced the cap, rotor and coil as well. Its been awhile for me and HEI but it all comes back.

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Daytona Yellow '75 350 Muncie 4 spd

  
Lottsa folks runnin the MSD sytems with no problems. Gotta remember...if it's electrical, it CAN and WILL fail at any given time, no matter who makes it...
Glad you got your's up and runnin again!


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"