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Old 03-20-2002, 09:47 AM   #1
stock86
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how do I bypass the spark control module?

Ive had a problem with my 86 k5 for a while now with it quiting or failing to crank sometimes. when it quits it will usually start back up instantly. I've found when this happens I have no fire to the plugs. Ive changed the ignition module,pick-up coil,cap rotor and plug wires in the distributor, replaced the ignition switch on the column, checked for loose or frayed wires and replaced the positive cable from the batt.
A friend was telling me it sounded like the spark control module, at least that what I think its called. the box under the passenger side dash that has 4 wires going to the distributor.
How can I bypass this to check and see if its the problem, also what is the purpose of this module. thanks
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Old 03-20-2002, 11:01 AM   #2
Blazer_Boy
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Re: how do I bypass the spark control module?

You have to cut wires comming out the firewall and tape them together and it'll work. So you just make a loop is all. I can't remember the order for sure, but its cake.
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Old 03-20-2002, 11:46 AM   #3
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Re: how do I bypass the spark control module?

i have had the same problem with my 86 k5. i have replaced everything from point a to b. are the wires from the firewall coming from the spark control module or the distributor? which way are you going for the loop? will it still pass the dreaded emissions test and run correctly?
thanks
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Old 03-20-2002, 12:06 PM   #4
ChevBlazin
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Re: how do I bypass the spark control module?

Get an HEI distributor made to work with out the spark controm module. Thats what I did. I think it's made for an 84? Camaro. If I recall I got it at NAPA, they directed me to what I would need.
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Old 03-20-2002, 12:25 PM   #5
stock86
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Re: how do I bypass the spark control module?

I hate to buy a dist. just to check the module. maybe someone can tell me what colors to splice togeather. btw we dont have emission testion in Mississippi so that is not a concern. I just want to bypass for trouble shooting. if it turns out to be the module I will replace the dist. to one without the module wires. thanks again
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Old 03-20-2002, 01:06 PM   #6
rlhenry
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Re: how do I bypass the spark control module?

If I remember correctly, I changed the pick-up coil and ignition module to those from an '80 Blazer. Now I have the 4 pin module instead of the 5. It's probably not emissions legal, but in rural AZ it doesn't matter.
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Old 03-20-2002, 03:54 PM   #7
stock86
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Re: how do I bypass the spark control module?

o.k. let me see if I have this right. if I change to a 4 pin ignition module I can just leave the spark control module wires unhooked?
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Old 03-20-2002, 04:14 PM   #8
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Re: how do I bypass the spark control module?

Is this fuel-injected?

Why not ask the computer what's wrong?

Jumper the ALDL and count the code coming from the "Check engine" light.
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Old 03-20-2002, 04:59 PM   #9
DesertDueler
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Re: how do I bypass the spark control module?

He is talking about the computer controled carb. I have one in my 86 as well.
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Old 03-20-2002, 07:59 PM   #10
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Re: how do I bypass the spark control module?

No he's talking about the ESC module. It was used from 81 to 86. I unplugged mine and swapped in an early HEI distributor...I had some drivabilty issues until i swapped distributors. I just left the ESC unplugged...

Rene
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